.
DTC Trouble Code Title, Conditions & Possible Causes:
P0016 1T: Crankshaft/Camshaft Timing Misalignment Conditions: Engine cranking or running; and the PCM detected the
camshaft was out of phase with the crankshaft during the CCM test period. Possible Causes: Base engine problem (i.e., the
camshaft timing is not correct) Intermittent condition CKP or CMP Sensor signal is erratic (check with lab scope) Tone wheel or
pulse wheel is damaged or contains debris CKP or CMP Sensor, harness or connector has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0031 1T: O2 (B1 S1) Heater Circuit Low Conditions: Key on; system voltage over 10.6v; ASD relay on; O2 heater "on". The
PCM detected the O2 Heater circuit is out of acceptable range low. Possible Causes: O2 assembly is damaged or it has failed
O2 heater element is damaged or has failed O2 heater control circuit is shorted to ground PCM has failed.
P0032 1T: O2 (B1 S1) Heater Circuit High Conditions: Key on; system voltage over 10.6v; ASD relay on; O2 heater "off". The
PCM detected the O2 Heater circuit is out of range high. Possible Causes: O2 heater element is damaged or the heater has
failed O2 heater control circuit is open or it is shorted to power O2 heater ground circuit is open PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0037 1T: O2 (B1 S2) Heater Circuit Low Conditions: Key on; system voltage over 10.6v; ASD relay on; O2 heater "on". The
PCM detected the O2 Heater circuit is out of acceptable range (i.e., below 0.0926v). Possible Causes: O2 assembly is damaged
or it has failed O2 heater element is damaged or has failed O2 heater control circuit is shorted to ground PCM has failed.
P0038 1T: O2 (B1 S2) Heater Circuit High Conditions: Key on; system voltage over 10.6v; ASD relay on; O2 heater "off". The
PCM detected the O2 heater voltage is out of range high. Possible Causes: O2 Sensor failed or improper operation O2 heater
element is damaged or failed O2 heater control circuit is open or it is shorted to power O2 heater ground circuit is open PCM
has failed.
P0043 1T :O2 (B1 S3) Heater Relay Circuit Low Conditions: Engine started; system voltage over 10.6v, ECT less within the test
condition value, and the PCM detected the Post Catalyst O2 heater Relay circuit voltage remained too high. Possible Causes:
O2 assembly is damaged or the O2 heater element is damaged or has failed O2 heater control circuit is shorted to ground PCM
has failed.
P0044 1T :O2 (B1 S3) Heater Relay Circuit High Conditions: Engine started; system voltage over 10.6v, ECT less within the test
condition value, and the PCM detected the Post Catalyst O2 heater Relay circuit voltage remained too high. Possible Causes:
O2 heater element is damaged, or the control circuit is open or shorted to power O2 heater ground circuit is open PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0051 1T: O2 (B2 S1) Heater Relay Circuit Low Conditions: Key on, system voltage over 10.6v, ASD relay on, O2 heater "on",
and the PCM detected the Heater Relay circuit Actual state did not match the Desired state (low circuit). 3 good trips are
required to turn off the MIL. Possible Causes: O2 assembly is damaged or it has failed O2 heater element is damaged or has
failed O2 heater control circuit is shorted to ground PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0052 1T: O2 (B2 S1) Heater Relay Circuit High Conditions: Key on, system voltage over 10.6v, ASD relay on, O2 heater "off",
and the PCM detected the Heater Relay circuit Actual state did not match the Desired state (high circuit). Possible Causes: O2
heater element is damaged or the heater has failed O2 heater control circuit is open or it is shorted to power O2 heater ground
circuit is open PCM has failed.
P0057 1T: O2 (B2 S2) Heater Relay Circuit Low Conditions: Key on, system voltage over 10.6v, ECT input under test condition
value, and the PCM detected the Heater Relay signal was too low. Possible Causes: O2 assembly is damaged or it has failed
O2 heater element is damaged or has failed O2 heater control circuit is shorted to ground PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0058 1T: O2 (B2 S2) Heater Relay Circuit High Conditions: Key on, system voltage over 10.6v, ASD powered up, and O2
heater is off. ECT input under test condition value and the PCM detected the Heater Relay signal was too high. Possible
Causes: O2 heater element is damaged or the heater has failed O2 heater control circuit is open or it is shorted to power O2
heater ground circuit is open PCM has failed.
P0068 1T: MAP Sensor/TP Sensor Correction - High Flow/Vacuum Leak Conditions: Engine started; engine speed over 2000
rpm, and the PCM detected the Manifold Air Pressure (MAP) value dropped to less than 1.5" Hg with the throttle closed during
the test. Possible Causes: An engine vacuum leak present High resistance in the MAP ground circuit, MAP Sensor signal or
VREF (5v) circuit High resistance in the TP ground, TP circuit or the TP Sensor VREF (5v) circuit MAP Sensor is damaged or it
has failed TP Sensor is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0070 1T: Ambient Temperature Sensor Circuit Stuck Conditions: Engine started 4 times, 4 warm-up cycles completed, vehicle
driven for 200 miles, and the PCM did not detect more than a 6°F change in the Ambient Air Temperature (AAT) Sensor signal
in the test. Possible Causes: AAT Sensor signal circuit shorted to power (VREF) AAT Sensor ground circuit is open AAT Sensor
signal circuit is open AAT Sensor signal circuit is shorted to ground PCM High or Low circuit is damaged or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0071 2T: Ambient Temperature Sensor Performance Conditions: Engine "off" time over 8 hours; DTC P0072 and P0073: not
set; ambient temperature more than 38°F (4C). The PCM determined the Ambient Air Temperature (AAT) Sensor was not within
calibrated temperature of the ECT and IAT Sensor signals after a cool down period. Possible Causes: AAT Sensor circuit open,
shorted to ground or VREF AAT Sensor voltage below 1.0v AAT signal circuit is open or is shorted to ground, to battery voltage
or to Sensor ground AAT Sensor ground circuit is open AAT Sensor is damaged or it has failed PCM High or Low circuit is
damaged or it has failed.
P0072 1T: Ambient Temperature Sensor Circuit Low Input Conditions: Related DTCs not set, key on or engine running; system
voltage over 10.5v, at least 5 warm-up cycles completed, odometer mileage change at least 196.6 miles, and the PCM detected
the AAT Sensor signal was less than 0.3v (0.78v: Jeep) at PCM. 3 good trips required to turn off MIL. Possible Causes: AAT
Sensor internal failure AAT signal circuit shorted to ground AAT signal circuit shorted to Sensor ground PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0073 1T: Ambient Temperature Sensor Circuit High Input Conditions: Key on or engine running; system voltage over 10.0v
and the PCM detected the Ambient Air Temperature (AAT) Sensor signal was more than 4.9v for more than 2.8 seconds. Note
that this code can be set due to an intermittent failure. 3 good trips are required to turn off the MIL. Possible Causes: AAT
Sensor signal shorted to VREF (5v) or battery voltage AAT Sensor signal circuit or Sensor ground circuit is open AAT Sensor is
damaged (it may be open) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0106 1T: BARO Out-Of-Range at Key On / MAP Sensor Low Conditions: Key on for less than 350 ms; engine speed less than
255 rpm, and the PCM detected the MAP Sensor input was less than 2.196v but more than 0.019v during a 300 ms period.
Possible Causes: Loss of 5-volt supply from PCM (internal failure) Sensor 5-volt supply circuit is shorted, open or grounded
Sensor signal circuit is open or shorted to ground Sensor has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0107 1T: MAP Sensor Circuit Low Input Conditions: Engine speed from 416-1470 rpm; TP Sensor input less than 1v, and the
PCM detected the MAP Sensor input was less than 2.35v at startup, or was less than 0.20v with the engine running (conditions
met for 1.76 seconds). Possible Causes: Loss of 5-volt supply from PCM (internal failure) Sensor 5-volt supply circuit is open or
shorted to ground Sensor signal circuit is shorted to ground Sensor or PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0108 1T: MAP Sensor Circuit High Input Conditions: Engine speed from 416-1470 rpm with the throttle closed; and the PCM
detected a MAP Sensor input of more than 4.6v (conditions met for 1 second). Possible Causes: MAP Sensor signal circuit is
open MAP Sensor ground circuit is open MAP Sensor signal circuit shorted to VREF (5v) MAP Sensor has failed or it has failed
(possible open circuit) PCM has failed.
P0110 1T: IAT Sensor Circuit High or Low Input Conditions: Key on for 60 seconds or right after startup; and the PCM detected
an IAT Sensor input of 4.6v or less than 0.2v for 4 seconds. Possible Causes: IAT Sensor signal circuit is open, shorted to
ground or to VREF IAT Sensor signal circuit has a high resistance condition IAT Sensor is damaged or it has failed PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0111 1T: IAT Sensor Performance Conditions: DTC P0112 and P0113 not set, key on, ECT Sensor input more than 160°F at
startup, at least 5 warm-up cycles have occurred with vehicle mileage change of more than 196.6 miles, and the PCM detected
the IAT input changed less than 5.4°F during this period. Possible Causes: IAT Sensor signal circuit is open, shorted to ground
or VREF IAT Sensor ground circuit is open IAT Sensor is damaged or it has failed PCM High or Low circuit is damaged or it has
failed.
P0112 1T: IAT Sensor Circuit Low Input Conditions: Ignition on or engine started; battery voltage greater than 10v. If the PCM
detected an IAT Sensor input of less than 0.1v (Neon), 0.157v (Cirrus/Sebring, Stratus, Caravan/Town & Country) or less than
0.078v (Durango, Ram, Grand Cherokee) for 3 seconds, less than 0.8v (Viper), or less than 0.5v (Liberty) this DTC will set.
Possible Causes: IAT Sensor signal circuit is shorted to chassis ground IAT Sensor signal circuit is shorted to Sensor ground
IAT Sensor is damaged or it has failed (an internal short circuit) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0113 1T: IAT Sensor Circuit High Input Conditions: Check with ignition on or engine running; battery voltage more than 10v;
The PCM detected the IAT Sensor input was over 4.90v (exc. Dakota, Durango, Ram) or 4.98v (Dakota, Durango, Ram) for 3
seconds. Possible Causes: IAT Sensor signal circuit shorted to VREF (5v) IAT Sensor signal circuit is open, or the ground circuit
is open IAT Sensor is damaged or it has failed (an internal open circuit) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0116 1T: ECT Sensor Circuit Performance Conditions: Engine started; engine runtime over 10 minutes, and the PCM detected
the ECT Sensor did not reach a calibrated level during the test period (i.e., it failed the CCM rationality test). Possible Causes:
ECT Sensor signal circuit is open or it is shorted to ground ECT Sensor signal circuit is shorted to VREF (5v) ECT Sensor
ground circuit is open ECT Sensor is damaged or it has failed PCM High or Low circuit is damaged or it has failed.
P01171T: ECT Sensor Circuit Low Input Conditions: Ignition on or engine started. The PCM detected the ECT Sensor input
voltage was below 0.51v (95-03) or 0.1v (04-05). Possible Causes: ECT Sensor signal circuit is shorted to chassis ground ECT
Sensor signal circuit is shorted to Sensor ground ECT Sensor is damaged or it has failed (it may be shorted) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0121 1T: Accelerator Position Sensor Signal Does Not Agree With IVS: Engine running at idle speed (throttle indicating less
than 15% open) for 1 second or running at off-idle with the VSS input indicating over 10 mph for 1 second, and the PCM
detected the IVS indicated idle when the APPS signal indicated off-idle, or the IVS indicated off-idle when the APPS indicated
the engine was at idle position. Possible Causes: APP Sensor signal circuit open APP Sensor signal circuit shorted to voltage
(IVS 2 circuit) APP Sensor short to vehicle power APP Sensor is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0122 1T: TP Sensor Circuit Low Input Conditions: Key on or engine running; system voltage over 10.5v and the PCM detected
the TP Sensor was less than 0.10v, condition met for 1.3 seconds. Possible Causes: Sensor 5-volt supply circuit open or
shorted to ground Sensor signal circuit is shorted to ground TP Sensor is damaged or it has failed PCM has failed.
P0122 1T: Accelerator Position Sensor Circuit Low Conditions: Engine started; and the PCM detected the APPS signal was to
low, or the APPS signal between the ECM and the Powertrain Control Module (PCM) was too low at any time. Possible Causes:
APP Sensor 5-volt supply circuit open or shorted to ground APP Sensor signal shorted to ground APP Sensor is damaged or it
has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0123 1T: Accelerator Position Sensor Circuit High Conditions: Engine started; and the PCM detected the APPS signal was too
high, or the APPS signal between the Engine Control Module (ECM) and the Powertrain Control Module (PCM) was too high at
any time. Possible Causes: APP Sensor Diesel circuit is open, or Sensor ground circuit is open APP Sensor signal shorted to
power APP Sensor has failed or the PCM has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0123 1T: Throttle Position Sensor No. 1 Circuit High Conditions: Ignition is on; battery voltage is more than 10.4v. The PCM
detected the TP Sensor voltage is more than 4.47v for 1.3 seconds (3.7L, 4.7L) or more than 4.8v for 25ms (5.7L). If equipped,
the ETC light will illuminate. Possible Causes: TP Sensor No. 1 circuit is open, or is shorted to battery voltage TP Sensor No. 1
signal circuit is shorted to 5v supply circuit TP Sensor ground circuit is open TP Sensor has failed Throttle body is damaged
(5.7L) Throttle plate is jammed against the maximum stop (5.7L) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0125 2T: Engine Does Not Reach Closed Loop Conditions: DTC P0112, P0113, P0117, P0118, P1492 and P0493 not set, key
on, IAT Sensor signal less than -80°F, system voltage over 10.4v, and the PCM detected the ECT Sensor was more than 140°F,
or with the ECT Sensor between -40°F and 150°F at startup, or it detected the ECT Sensor did not change more than 6°F after
10 minutes. Possible Causes: Check the operation of the thermostat (it may be stuck open) ECT Sensor is damaged or it is outof-
calibration Inspect for low coolant level or for an incorrect coolant mixture.
DTC Trouble Code Title, Conditions & Possible Causes:
P0129 1T: Barometric Pressure Out-Of-Range Conditions: Engine cranking at less than 250 rpm; no CKP or CMP Sensor
signals within 75ms. The PCM detected the MAP/BARO Sensor signal range was 0.04- 2.2v for 300ms during testing. If
equipped, the ETC lamp will be illuminated. 3 good trips are required to turn off the MIL. Possible Causes: IAC motor control low
or control high circuit has failed MAP Sensor VREF (5v) circuit is open or shorted to ground MAP Sensor signal circuit is open or
shorted to ground MAP Sensor is damaged or it has failed May be an intermittent condition PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0130 1T: O2 (B1 S1) Circuit Fault Conditions: Key on or engine running; system voltage over 10.5v and the PCM detected the
state of the O2 relay coil circuit (between the PCM and the relay) did not match the expected state. Possible Causes: Fused
ignition feed (power) circuit open Heater relay control circuit open Heater relay has failed (an internal winding is open) PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0131 1T: O2 (B1 S1) Circuit Short to Ground Conditions: Engine running with ECT Sensor over 146°F, followed by an engine
off period in which the O2 heater Test ran and passed, then after an engine cool-down period, and a cold engine startup (ECT
Sensor under 100°F and the BTS signal within 44°F of the ECT Sensor), the PCM detected the O2 signal was less than 78 mV
for 5 seconds. Possible Causes: O2 signal circuit is shorted to chassis or Sensor ground O2 ground circuit is open (circuit reads
170 mV when open) O2 may be contaminated or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0132 1T: O2 (B1 S1) Circuit Short to Voltage Conditions: Engine started; engine runtime over 119 seconds, system voltage
over 10.99v, O2 heater temperature over 1085°F and the PCM detected the O2 input was over 3.70v for 1 minute. Possible
Causes: O2 signal tracking (wet/oily) in connector causing a short between the signal and heater power circuits O2 ground
circuit is open O2 signal circuit is open PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0133 2T: O2 (B1 S1) Slow Response Conditions: Engine runtime over 2 minutes, ECT Sensor more than 147° F, VSS over 10
mph, A/C and PSPS indicating off, then at idle speed in Drive (A/T) or Neutral (M/T), and the PCM detected the O2 signal did
not switch enough times from 270-620 mV in the test period. Possible Causes: Exhaust leak present in the exhaust manifold or
exhaust pipes O2 element is fuel contaminated O2 element is deteriorated or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0136 1T: O2 (B1 S2) Heater Circuit Low Input Conditions Key on, cold engine conditions, system voltage over 10.5v, ASD
relay on, and the PCM detected the Actual state of the Heater relay circuit did not match the Intended state (i.e., the circuit
status remained in a low state). Possible Causes: Fused ignition feed (power) circuit to the relay is open Heater relay control
circuit is open Heater relay or PCM has failed.
P0137 1T: O2 (B1 S2) Circuit Short to Ground Conditions: ECT Sensor over 170°F at previous key off, O2 heater Test
completed, engine cool down period finished, engine started, ECT Sensor less than 98°F and BTS signal within 27°F of the ECT
Sensor, and PCM detected the O2 signal was below 156 mV for 28 seconds. Possible Causes: O2 signal circuit is shorted to
chassis or Sensor ground O2 ground circuit is open (circuit reads 170 mV when open) O2 may be contaminated or it has failed
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0138 1T: O2 (B1 S2) Circuit Short to Voltage Conditions: Engine started; engine runtime more than 4 minutes, system voltage
over 10.5v, ECT Sensor more than 180°F, and the PCM detected the O2 signal was more than 1.50v for 3 seconds. Possible
Causes: O2 signal tracking (wet/oily) in connector due to short from signal to power circuit O2 signal circuit is open O2 ground
circuit is open O2 is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0139 1T: O2 (B1 S2) Slow Response Conditions: Engine started; vehicle driven at 20-55 mph with the throttle open for 2
minutes, ECT Sensor more than 158°F, Converter temperature over 1112°F, EVAP purge "on", and the PCM detected the O2
signal switched from rich-to-lean less than 11 times in 20 seconds. Possible Causes: Exhaust leak present in the exhaust
manifold or exhaust pipes O2 element is contaminated, deteriorated or it has failed O2 ground or O2 signal circuit has high
resistance.
DTC Trouble Code Title, Conditions & Possible Causes:
P0140 2T: O2 (B1 S2) Remains At Center Conditions: Engine started; system voltage over 10.5v, ECT Sensor over 150.8°F,
engine running in closed loop, and the PCM detected the O2 signal was fixed at 350-580 mV for 60 seconds. Possible Causes:
Exhaust leak present in exhaust manifold or exhaust pipes O2 element is fuel contaminated or has deteriorated O2 signal circuit
or ground circuit has high resistance PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0141 1T: O2 (B1 S2) Heater Circuit Conditions: ECT Sensor less than 147°F, BTS signal within 27°F of ECT Sensor (cold
engine); engine running at idle speed for over 12 seconds, system voltage over 10.5v and the PCM detected the O2 signal was
more than 3.0v for 30-90 seconds. Possible Causes: ASD relay output (power) circuit to the heater is open O2 heater ground
circuit open or O2 signal circuit is open O2 heater element has high resistance O2 heater element has failed (open or shorted)
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0143 1T: O2 (B1 S3) Short to Ground Conditions: ECT Sensor more than 170°F on previous key on, ECT Sensor less than
98°F and the BTS signal within 59°F of the ECT Sensor at startup (cold engine), and the PCM detected the O2 signal was less
than 156 mV for 28 seconds. Possible Causes: O2 signal circuit is open or is shorted to chassis or Sensor ground O2 signal
circuit is open (circuit reads 450 mV when open) O2 may be contaminated or it has failed.
P0144 1T: O2 (B1 S3) Short to Voltage Conditions: Engine runtime over 2 minutes, ECT Sensor more than 180°F, and the PCM
detected the O2 signal was more than 1.50v. Possible Causes: O2 signal tracking in connector due to a short between the
signal and power circuits O2 signal circuit shorted to system power O2 signal circuit open, or ground circuit open O2 heater
supply circuit is open PCM has failed.
P0145 2T: O2 (B1 S3) Slow Response Conditions: Engine started; ECT Sensor more than 170°F, VSS input over 10 mph with
throttle open for 2 minutes, then back to idle speed in Drive (A/T) or Neutral (M/T), and the PCM detected the O2 signal did not
switch enough times from 270-620 mV during the O2 Test. Possible Causes: Exhaust leak present in the exhaust manifold or
exhaust pipes O2 element is fuel contaminated or the O2 element is deteriorated PCM has failed.

 

Please do not post has i am still working on the other pages. Thank you

 

OBD II Trouble Code Lists
P0147 1T: O2 (B1 S3) Heater Fault Conditions: ECT Sensor less than 147°F, BTS signal within 27°F of ECT Sensor (cold
engine), engine running at idle speed for over 12 seconds, system voltage over 10.5v and the PCM detected the O2 signal was
more than 3.0v for 30-90 seconds. Possible Causes: ASD relay output (power) circuit to the heater is open O2 heater ground
circuit open or O2 signal circuit is open O2 heater element has high resistance O2 heater element has failed (open or shorted)
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0151 1T: O2 (B2 S1) Circuit Short to Ground Conditions: ECT Sensor more than 170°F on previous key on, ECT Sensor less
than 98°F and the BTS signal within 27°F of the ECT Sensor at startup (cold engine), and the PCM detected the O2 signal was
less than 156 mV for 28 seconds. Possible Causes: O2 signal circuit is shorted to chassis or Sensor ground O2 signal circuit is
open (circuit reads 450 mV when open) O2 ground circuit is open (circuit reads 170 mV when open) O2 may be contaminated or
it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0152 1T: O2 (B2 S1) Short to Voltage Conditions: Engine runtime over 4 minutes, system voltage over 10.5v, ECT Sensor
more than 180°F, and the PCM detected the O2 signal was more than 1.50v for 3 seconds during the CCM test. Possible
Causes: O2 signal tracking in connector due to wet/oily conditions O2 ground circuit is open O2 heater supply circuit is open O2
signal circuit is open O2 element is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0153 1T: O2 (B2 S1) Slow Response Conditions: Engine started; ECT Sensor more than 147°F, VSS input over 10 mph with
throttle open for 2 minutes, then back to idle speed in Drive (A/T) or Neutral (M/T), and the PCM detected the O2 signal did not
switch enough from 270-620 mV during the O2 Test. Possible Causes: Exhaust leak present in the exhaust manifold or exhaust
pipes O2 signal or ground circuit has a high resistance condition O2 element is fuel contaminated O2 element is deteriorated or
it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0154 1T: O2 (B2 S1) Remains At Center Conditions: Engine started; ECT Sensor more than 147°F, VSS input over 10 mph
with throttle open for 2 minutes, then back to idle speed in Drive (A/T) or Neutral (M/T), and the PCM detected the O2 signal did
not switch enough from 270-620 mV during the O2 Test. Possible Causes: Exhaust leak present in the exhaust manifold or
exhaust pipes O2 signal or ground circuit has a high resistance condition O2 element is fuel contaminated O2 element is
deteriorated or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0155 1T: O2 (B2 S1) Heater Circuit Conditions: ECT Sensor less than 147°F, BTS signal within 27°F of ECT Sensor (cold
engine), engine running at idle speed for over 12 seconds, system voltage over 10.5v and the PCM detected the O2 signal was
more than 3.0v for 30-90 seconds. Possible Causes: ASD relay output (power) circuit to the heater is open O2 heater ground
circuit open or O2 signal circuit is open O2 heater element has high resistance O2 heater element has failed (open or shorted)
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0157 1T: O2 (B2 S2) Circuit Shorted to Ground Conditions: ECT Sensor more than 170°F at previous key off, O2 heater Test
completed after shutdown, engine cool-down period completed, then engine started, ECT Sensor less than 98°F and the BTS
signal within 27°F of the ECT Sensor (cold engine), and the PCM detected the O2 signal was less than 156 mV for 28 seconds
during the test. Possible Causes: O2 signal circuit is shorted to chassis or Sensor ground O2 may be contaminated or it has
failed PCM return or signal circuit is damaged or has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0158 1T: O2 (B2 S2) Circuit Shorted to Ground Conditions: Engine runtime over 4 minutes, system voltage over 10.5v, ECT
Sensor more than 180°F, and the PCM detected the O2 signal was more than 1.50v, condition met for 3 seconds. Possible
Causes: O2 signal tracking due to wet/oily condition in the connector O2 signal circuit is open or shorted to system power O2 is
damaged or is has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0159 2T: O2 (B2 S2) Slow Response Conditions: Engine started; ECT Sensor more than 170°F, VSS input over 10 mph with
throttle open for 2 minutes, then back to idle speed in Drive (A/T) or Neutral (M/T), and the PCM detected the O2 signal did not
switch enough times from 270-620 mV during the O2 Test. Possible Causes: Exhaust leak present in the exhaust manifold or
exhaust pipes O2 element is fuel contaminated O2 element is deteriorated or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0161 1T: O2 (B2 S2) Slow Response Conditions: ECT Sensor less than 147°F and BTS signal within 27°F of the ECT Sensor
(cold engine), engine started, system voltage over 10.5v, engine running at idle speed for over 12 seconds, and the PCM
detected the O2 signal was more than 3.0v for 30-90 seconds. Possible Causes: ASD relay output (power) circuit to the heater
is open O2 heater ground circuit is open or O2 signal circuit open O2 heater element has high resistance, is open or shorted
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0165 1T: Starter Relay Circuit Conditions: Engine cranking and the PCM did not detect the correct voltage signal from the
Starter relay control circuit. Possible Causes: Starter Relay control circuit is open Starter Relay Control circuit is grounded PCM
has failed.
P0168 1T: Decreased Performance (High Injection Pump Fuel Temperature) Conditions: Engine started. The PCM detected
decreased performance from the Injector Pump due to a high injection fuel pump temperature. Possible Causes: Fuel Injection
pump module has failed Overflow Valve Test failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0171 2T: Fuel System Lean (Bank 1) Conditions: Engine running in closed loop, ambient temperature over 20°F, altitude less
than 8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a lean A/F condition. Possible
Causes: Air leaks in intake manifold, exhaust pipes or exhaust manifold Base engine mechanical problem causing a lean A/F
condition Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery component fault (clogged filter, low fuel
pressure) O2 element is contaminated, deteriorated or it has failed Vacuum hose is disconnected, broken, leaking or loose.
P0171 2T: Fuel System Lean (Bank 1) Conditions: Engine running in closed loop; IAT Sensor signal over 20°F; altitude less
than 8,000 feet. The PCM detected too large an amount of Fuel Trim correction due to a lean A/F condition. Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed Vacuum hose is disconnected, broken, leaking or loose.
DTC Trouble Code Title, Conditions & Possible Causes:
P0172 2T: Fuel System Rich (Bank 1) Conditions: Engine running in closed loop, IAT Sensor signal over 20°F, altitude less than
8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a rich A/F condition. Possible Causes:
Base engine fault (i.e., cam timing incorrect, oil level too high) EVAP vapor recovery system failure (e.g., canister full of fuel)
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery component fault (injector leak, high fuel pressure)
O2 element is contaminated, deteriorated or it has failed O2 heater is damaged or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0172 2T: Fuel System Rich (Bank 1) Conditions: Engine running in closed loop, IAT Sensor signal over 20°F, altitude less than
8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a rich A/F condition. Possible Causes:
Base engine fault (i.e., cam timing incorrect, oil level too high) EVAP vapor recovery system has failed (canister full of fuel) Fuel
injector (one or more) leaking or pressure regulator leaking O2 element is deteriorated or has failed.
P0174 2T: Fuel System Lean (Bank 2) Conditions: Engine running in closed loop, IAT Sensor signal over 20°F, altitude less
than 8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a lean A/F condition. Possible
Causes: Air leaks in intake manifold, exhaust pipes or exhaust manifold Base engine mechanical problem causing a lean A/F
condition Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery component fault (clogged filter, low fuel
pressure) O2 element is contaminated, deteriorated or it has failed Vacuum hose is disconnected, broken, leaking or loose.
DTC Trouble Code Title, Conditions & Possible Causes:
P0174 2T: Fuel System Lean (Bank 2) Conditions: Engine running in closed loop, IAT Sensor signal over 20°F, altitude less
than 8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a lean A/F condition. Possible
Causes: Air leaks in intake manifold, exhaust pipes or exhaust manifold Base engine mechanical problem causing a lean A/F
condition Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery component fault (clogged filter, low fuel
pressure) O2 element is contaminated, deteriorated or it has failed Vacuum hose is disconnected, broken, leaking or loose.
DTC Trouble Code Title, Conditions & Possible Causes:
P0175 2T: Fuel System Rich (Bank 2) Conditions: Engine running in closed loop, IAT Sensor signal over 20°F, altitude less than
8,000 feet, and the PCM detected too large an amount of Fuel Trim correction due to a rich A/F condition. Possible Causes:
Base engine fault (i.e., cam timing incorrect, oil level too high) EVAP vapor recovery system has failed (canister full of fuel) Fuel
injector (one or more) leaking or pressure regulator leaking O2 element is deteriorated or has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0177 1T: Water in Fuel Signal Circuit Fault Conditions: Key on. The PCM detected the Water in Fuel (WIF) Sensor signal was
out of range low. Possible Causes: Water In Fuel Sensor has detected water in the fuel supply (drain the water from the fuel
filter and then retest for the code) Water In Fuel Sensor signal circuit shorted to Sensor ground Water In Fuel Sensor signal
circuit shorted to chassis ground PCM has failed.
P0178 1T: Water in Fuel Sensor Low Input Conditions: Key on, and the PCM detected the Water in Fuel (WIF) Sensor signal
was less than 0.51v. Possible Causes: Water In Fuel Sensor signal circuit shorted to Sensor ground Water in Fuel Sensor signal
circuit shorted to chassis ground Water in Fuel Sensor has failed PCM has failed.
P0180 1T: Fuel Injection Pump Temperature Out-Of-Range Conditions: Engine started; and the PCM detected the temperature
of the fuel was out of its normal operating range during the test period. Possible Causes: Fuel injection pump has failed (this
code is normally caused by an internal failure of the fuel injection pump) PCM has failed.
P0181 1T: Fuel Injection Pump Failure Conditions: Key on or engine running; and the PCM detected the signal from the Fuel
Temperature Sensor signal was too high or too low in the test. Note: The Sensor is located inside the Bosch VP44 Pump
Controller. Possible Causes: Fuel Temperature Sensor has failed (this Sensor is not serviceable without replacing the VP44
pump controller unit). Engine power is "de-rated" when this trouble code is set PCM has failed.
P0182 1T: CNG Temperature Sensor Low Input Conditions: Key on or engine running; and the PCM detected the CNG
temperature Sensor signal was less than 0.51v during the test. Possible Causes: CNG Sensor signal circuit is shorted to Sensor
ground CNG Sensor signal circuit is shorted to chassis ground CNG Sensor has failed (it may be shorted internally) PCM has
failed.
P0183 1T: CNG Temperature Sensor High Input Conditions: Key on or engine running; and the PCM detected the CNG
temperature Sensor signal was more than 4.96v during the test. Possible Causes: CNG Sensor signal circuit is open CNG
Sensor signal circuit is shorted to vehicle power CNG Sensor has failed (it may be open internally) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0201-P0210 1T: Injector 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 Control Conditions: ASD relay "on", engine speed under 3000 rpm,
injector pulse width under 10 ms, system voltage over 12v, and the PCM did not detect any inductive spike from the injector for
0.18 ms after it is turned off. Note: This code takes 0.64-10 seconds to set once the injector is off. Possible Causes: Fuel injector
1-10 control circuit is open or grounded Fuel injector 1-10 power circuit from the ASD relay is open Fuel injector 1-10 has failed
PCM injector 1-10 driver has failed.
P0215 1T: Fuel Injection Pump Control Circuit Conditions: Key on, and the PCM did not detect any power present on the Fuel
Injection Pump control circuit (VP44) during the CCM test period. Possible Causes: Fuel injection pump relay control circuit
open, shorted to ground Fuel injection pump relay ground circuit is open Fuel injection pump relay has failed Engine Control
Module has failed.
P0216 1T: Fuel Injection Pump Timing Failure Conditions: No other fuel injection pump trouble codes set, engine speed more
than 300 rpm, fuel command 5 ml/stroke, and the PCM detected the pump timing command was out of range. Possible Causes:
Fuel injection pump gear not aligned properly Fuel filter plugged or restricted Fuel injection pump is damaged Transfer pump
inlet line restricted.
DTC Trouble Code Title, Conditions & Possible Causes:
P0217 1T: Decreased Performance (Engine Overheat) Conditions: Engine started; and the PCM detected that the signal from
the ECT Sensor indicated an engine overheat condition existed. Note: Measure coolant temperature (with thermal couple) and
compare to the scan tool ECT PID (they should be within 10°F of each other). Possible Causes: ECT Sensor circuit has high
resistance ECT Sensor is damaged or has deteriorated PCM has failed.
P0218 1T: A/T High Temperature Operation Activated Conditions: Engine started; vehicle driven in gear, and the TCM indicated
the Overheat shift schedule was activated (i.e., the TCM had detected a transmission oil temperature of more than 240°F). Note:
This is an informational DTC, designed to aid the technician in diagnosing shift quality complaints. Possible Causes: Engine
cooling system malfunction present High temperature operations activated Transmission oil pump flow is too low or it is
restricted.
P0219 1T: Crankshaft Position Sensor Over-Speed Signal Conditions: Engine started; and the PCM detected the engine had
exceeded its over-speed value. Possible Causes: CKP Sensor or its tone wheel is damaged (incorrect engine speed reading)
Induction of an alternate fuel source (i.e., ether or propane) Improper operating conditions (i.e., motoring downhill) Turbocharger
seals are leaking.
DTC Trouble Code Title, Conditions & Possible Causes:
P0222 1T: Idle Validation Signals Both Low Conditions: Key on, and the PCM detected that the Idle Validation Signal No. 1 and
Idle Validation Signal No. 2 both indicated "no" voltage during the test. Possible Causes: APP Sensor is damaged IVS No. 1 or
IVS No. 2 circuit(s) is shorted to Sensor ground or to chassis ground IVS No. 1 or IVS No. 2 is damaged or has failed Engine
Control Module has failed.
P0223 1T: Idle Validation Signals Both High Conditions: Key on, and the PCM detected that the Idle Validation Signal No. 1 and
Idle Validation Signal No. 2 both indicated high voltage during the test. Possible Causes: APP Sensor is damaged, or the
Sensor ground circuit is open IVS No. 1 or IVS No. 2 circuit (s) is open or shorted to system power IVS No. 1 or IVS No. 2 is
damaged or has failed Engine Control Module has failed.
P0224 Turbocharger Boost Limited Exceeded Conditions.
P0230 1T: Transfer Pump (Lift Pump) Circuit Out-Of-Range Conditions: Key on, and the PCM detected the Transfer Pump
signal was too high or low during testing. Possible Causes: Transfer Pump power feed circuit open, or shorted to ground
Transfer Pump ground circuit is open Transfer Pump (internal) resistance out of range Engine Control Module has failed.
P0232 1T: Fuel Shutoff Signal Voltage to High Conditions: Key on, and the PCM detected that the Fuel Shutoff Signal was too
high due a problem. Possible Causes: Transfer Pump may be damaged Engine Control Module has failed.
P0234 1T: Turbo Boost Limit Exceeded Conditions: No Intake Air Pressure Sensor codes set, engine speed over 2200 rpm, and
the PCM detected the Turbo Boost exceeded its limit due to a problem in the Turbocharger Wastegate Unit. Possible Causes:
Wastegate is stuck Wastegate has failed (due to a mechanical failure).
DTC Trouble Code Title, Conditions & Possible Causes:
P0236 1T: MAP Sensor Voltage Too High To Long Conditions: DTC P0106, P0107 and P0108 not set, engine started and the
PCM detected the Pressure Test failed because the MAP Sensor signal was too high. This occurs if the Boost Pressure Sensor
indicates high when other related signals (load and speed signals) indicate low. Possible Causes: MAP Sensor signal circuit
open, shorted to ground or to power MAP Sensor has failed Engine Control Module has failed.
P0237 1T: MAP Sensor Voltage Too Low Conditions: Engine started, engine speed from 416-3520 rpm, system voltage over
10.5v and the PCM detected the MAP Sensor was under 0.10v. Possible Causes: Boost Pressure Test did not pass, or a MAP
VREF DTC is present MAP Sensor signal circuit shorted to chassis or Sensor ground MAP Sensor has failed.
P0238 1T: MAP Sensor Voltage Too High Conditions: Engine speed more than 416 rpm but less than 3520 rpm, system voltage
over 10.5v and the PCM detected the MAP Sensor signal was more than 4.88v, condition met for 2 seconds. Possible Causes:
Boost Pressure Test did not pass, ECT or IAT DTC present MAP Sensor signal circuit open or shorted to vehicle power MAP
Sensor has failed Engine Control Module has failed.
P0251 1T: Injector Pump Mechanical / Fuel Valve Feedback Circuit Fault Conditions: DTC P1284 not set, key on, system
voltage over 12.0v, fuel command 20 ml/stroke, Fuel Delivery valve enabled, and the PCM detected the Fuel Valve feedback
signal was over 9.0v. Possible Causes: Fuel injection pump relay control circuit is open or grounded. Fused battery power (B+)
circuit or relay output circuit is open Fuel injection pump relay or fuel injection pump is damaged.
DTC Trouble Code Title, Conditions & Possible Causes.
P0252 1T: Fuel Valve Signal Missing Conditions: Engine started; system voltage over 10.5v, Fuel Valve current feedback test
completed, and the PCM detected a signal from the Fuel Metering valve that indicated the valve had moved. Possible Causes:
Fuel injection pump relay control circuit is open or grounded. Fused battery power (B+) circuit or relay output circuit is open. Fuel
injection pump relay or fuel injection pump is damaged.
P0253 1T: Injector Pump Fuel Valve Current Too Low Conditions: Engine started; engine speed more than 100 rpm and the
PCM detected a condition of low current (or no current) at the Fuel Metering Valve during the test period (there may be an open
circuit). Refer to code repair chart in other manuals to test this code.
P0254 1T: Injector Pump Fuel Valve Current Too High Conditions: Key "off", and the PCM detected system voltage (power) at
the Fuel Metering Valve VP44 circuit during the test period. Possible Causes: Fuel injection pump is damaged or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0300 1T: Multiple Cylinder Misfire Detected Conditions: Engine less than 3000 rpm; adaptive numerator updated. PCM
detected a misfire rate of 1-2% (High Emissions 2T), or a misfire rate of 6-30% (Catalyst Damaging 1T) in 2 or more cylinders.
Note: If the misfire is severe, the MIL will flash on/off on the 1st trip! Possible Causes: Air leak in the intake manifold, or in the
EGR or EVAP system Base engine mechanical fault that affects two or more cylinders Erratic or interrupted CKP or CMP
Sensor signals Fuel delivery component fault that affects two or more cylinders (i.e., a contaminated, dirty or sticking fuel
injector) Ignition system problem (coil or plug) in two or more cylinders Vehicle driven with low fuel pressure or while very low on
fuel.
P0300 1T: Multiple Cylinder Misfire Detected Conditions: Engine less than 3000 rpm; adaptive numerator updated. PCM
detected a misfire rate of 1% (High Emissions 2T), or a misfire rate of 6-30% (Catalyst Damaging 1T) in two or more cylinders.
Note: If the misfire is severe, the MIL will flash on/off on the 1st trip! Possible Causes: Air leak in the intake manifold, or in the
EGR or EVAP system Base engine mechanical fault that affects two or more cylinders Erratic or interrupted CKP or CMP
Sensor signals Fuel delivery component fault that affects two or more cylinders Ignition system problem (coil or plug) in two or
more cylinders Vehicle driven with low fuel pressure or while very low on fuel.
P0300 1T: Multiple Cylinder Misfire Conditions: Engine less than 880 rpm; ECT Sensor above 140°F; VSS at 0 mph; PTO
inactive. PCM detected the time for crankshaft to turn 120 during firing event of one or more cylinders compared to the time for
the crank to turn 120 for the previous cylinder exceeded 240 microseconds. Note: If the misfire is severe, the MIL will flash on/off
on the 1st trip! Possible Causes: Air leak (manifold, PCV) that affects more than 1 cylinder Base engine problem that affects
more than 1 cylinder CMP Sensor, Sensor wiring harness or tone wheel is damaged Ignition system problem that affects more
than one cylinder Fuel metering problem (fuel injectors, fuel pressure) that affects more than one cylinder EGR or EVAP Purge
problem that affects more than 1 cylinder.
DTC Trouble Code Title, Conditions & Possible Causes:
P0301-P0310 1T:Cylinder 1-10 Misfire Detected Conditions: Engine speed less than 3000 rpm, adaptive numerator updated,
and the PCM detected a misfire rate of 1-2% (High Emissions 2T), or a misfire rate of 6- 30% (Catalyst Damaging 1T) in only
one cylinder. Note: If the misfire is severe, the MIL will flash on/off on the 1st trip! Possible Causes: Air leak in the intake
manifold, or in the EGR or EVAP system Base engine mechanical fault that affects only one cylinder Fuel delivery component
fault that affects only one cylinder (e.g., a dirty fuel injector) Ignition system problem (coil or plug) in only one cylinder.
DTC Trouble Code Title, Conditions & Possible Causes:
P0301-P0308 1T: Cylinder 1-8 Misfire Detected Conditions: Engine speed less than 3000 rpm, adaptive numerator updated, and
PCM detected a misfire rate of 1% (High Emissions 2T), or a misfire rate of 6-30% (Catalyst Damaging 1T) in a single cylinder.
Note: If the misfire is severe, the MIL will flash on/off on the 1st trip! Possible Causes: Air leak in the intake manifold, or in the
EGR or EVAP system Base engine mechanical fault that affects only one cylinder Erratic or interrupted CKP or CMP Sensor
signals Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector) Ignition system problem (coil or
plug) that affects only one cylinder.
P0301-P0306 1T: Cylinder 1-6 Misfire Detected Conditions: Engine started; engine speed below 860 rpm, ECT Sensor over
140°F, VSS at 0 mph, PTO "off", and the PCM detected the time for the crankshaft to turn 120 degrees while firing one cylinder
when compared to the time for the crankshaft to turn 120 degrees for the previous cylinder exceeded 40 ms. Note: If the misfire
is severe, the MIL will flash on/off on 1st trip! Possible Causes: Base engine mechanical fault that affects only one cylinder CMP
Sensor, Sensor wiring harness or tone wheel is damaged Fuel delivery component fault that affects only one cylinder (e.g., a
dirty fuel injector).

 

P0325 1T: Knock Sensor No. 1 Circuit Conditions: Engine running at idle or in deceleration mode, and the PCM detected the
Knock Sensor signal was below a minimum value (value depends on engine speed), or if Sensor voltage was about 5.0v with
engine within idle range. Possible Causes: Knock Sensor connector is damaged or shorted Knock Sensor signal circuit open or
grounded Knock Sensor signal circuit shorted to return circuit Knock Sensor return circuit is open Knock Sensor not tightened
properly Knock Sensor damaged or has failed (it may be open internally) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0330 1T: Knock Sensor No. 2 Circuit Conditions: Engine running at idle or in deceleration mode, and the PCM detected the
Knock Sensor No. 2 signal was below a minimum value (value depends on engine speed), or was more than 5.0v. Possible
Causes: Knock Sensor signal circuit open or grounded Knock Sensor not tightened properly Knock Sensor damaged or has
failed (it may be open internally) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0335 1T: Crankshaft Position Sensor Circuit Conditions: Engine cranking with at least 8 CMP Sensor signals detected. The
PCM did not detect any CKP Sensor signals for 2 seconds. Possible Causes: Intermittent CKP signal CKP Sensor signal circuit
is open or it is shorted to ground or voltage CKP Sensor 5v supply circuit is open or shorted to ground or voltage CKP Sensor
ground circuit is open CKP Sensor or CMP Sensor is damaged or has failed PCM has failed.
P0336 1T: Crankshaft Position Sensor Signal Conditions: Engine started; CMP Sensor signals detected, and the PCM did not
detect any change in the CKP Sensor signal during the test period. Possible Causes: Check the tone or pulse ring for damage
or debris collection CKP Sensor signal circuit is open or shorted to ground CKP Sensor VREF circuit is open or shorted to
ground CKP Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0339 1T: Crankshaft Position Sensor Circuit Intermittent Conditions: Engine cranking or running; CMP Sensor signals
detected. The PCM detected an intermittent loss of the CKP Sensor signal. The Failure counter must reach 20 before this code
will set. Possible Causes: Check the tone wheel/pulse ring for damage or debris collection CKP Sensor signal circuit is open or
shorted to ground CKP Sensor 5v supply circuit is open or shorted to ground CKP Sensor is damaged or it has failed PCM has
failed.
P0340 1T: No Camshaft Position Sensor Circuit Failure Conditions: Engine cranking or running, system voltage over 10v. The
PCM detected CKP pulses without detecting any CMP Sensor pulses for 5 seconds or 2.5 engine revolutions. Possible Causes:
CMP Sensor connector is damaged, open or it is shorted CMP Sensor signal circuit is open or shorted to ground or to battery
voltage or 5v supply circuit CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage CMP Sensor ground
circuit is open CMP Sensor is damaged or has failed CKP Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0341 1T: Camshaft Position Sensor Signal Conditions: Engine started; system voltage from 8.0-15v, and the PCM detected an
incorrect tone wheel tooth signal occurred 25 times in 8 seconds, or the PCM did not detect any CMP Sensor signals for 2
seconds. Possible Causes: CMP Sensor signal circuit is open or shorted to ground CMP Sensor VREF circuit is open or shorted
to ground CMP Sensor is damaged or has failed PCM has failed.
P0342 1T: CMP Sensor Supply Voltage Too Low Conditions: Engine started; system voltage from 8.0-15v, and the PCM
detected the CMP Sensor VREF signal was less than 4.2v for 2 seconds. Possible Causes: CMP Sensor connector is damaged,
open or it is shorted CMP Sensor VREF circuit is open CMP Sensor VREF circuit is shorted to ground CMP Sensor is damaged
or has failed PCM has failed.
P0343 1T: CMP Sensor Supply Voltage Too Low Conditions: Engine cranking or engine running, system voltage over 10.5v and
the PCM detected an intermittent loss of the CMP Sensor signal during the period of 2.5 complete engine revolutions. The
failure counter must reach 20 before this code matures and a code is set. Possible Causes: CMP Sensor signal circuit is open
(intermittent fault) CMP Sensor signal circuit shorted to ground (intermittent fault) CMP Sensor ground circuit is open (an
intermittent fault) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0344 1T: Camshaft Position Sensor Circuit Intermittent Conditions: Engine cranking or running; system voltage over 10.5v.
The PCM detected an intermittent loss of the CMP Sensor signal during the period of 2.5 complete engine revolutions. The
failure counter must reach 20 before this code matures and a code is set. Possible Causes: Wiring harness fault 5v supply
circuit open or shorted to ground Tone wheel/pulse ring is damaged or corroded CMP Sensor has failed CMP Sensor signal
circuit is open, shorted to ground or battery voltage or 5v supply CMP Sensor ground circuit is open PCM has failed.
P0350 1T: Ignition Coil Current Too High Conditions: Engine started; and the PCM detected the Ignition Coil current level was
too high. Possible Causes: Ignition Coil No. 1, 2 or 3 control circuit (the coil windings) shorted internally Ignition Coil No. 1, 2 or 3
control circuit is shorted to ground PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0351, P0152, P0153 1T: Ignition Coil No. 1, 2 or 3 Primary Circuit Conditions: Engine cranking or running; ASD relay on,
system voltage over 10v, Coil No. 1, 2 or 3 was not in dwell period when it was checked, and the PCM detected that the peak
coil current was not reached in 2.5 ms of dwell for 3-6 seconds. The coil primary resistance is less than 2 ohms. Possible
Causes: ASD relay power circuit to the ignition coil is open Ignition Coil No. 1, 2 or 3 primary "driver" circuit open or grounded
Ignition Coil No. 1, 2 or 3 is damaged or it has failed PCM has failed.
P0351-P0358 1T: Ignition Coil No. 1-8 Primary Circuit Conditions: Engine cranking or speed less than 2012 rpm, ASD relay on,
system voltage 8v or 12v, coils not in dwell period, and the PCM detected peak coil current was not reached in 2.5 ms of dwell
for 3-6 seconds. The coil primary resistance is less than 2 ohms. Possible Causes: ASD relay power circuit to the ignition coil is
open Ignition coil primary "driver" circuit open or grounded Ignition coil is damaged or it has failed PCM has failed.
P0370 1T: Fuel Injection Pump Speed Sensor Signal Lost Conditions: Engine started; and the PCM detected that it lost the Fuel
Injection Pump Speed/Position Signal (due to a fault in the internal Fuel injection Pump (the pump may have failed). Possible
Causes: ECM cannot control the engine speed through circuit WP44 Fuel Injection pump has failed due to an internal problem.
P0380 1T: Intake Air Heater Relay No. 1 Control Circuit Conditions: Key on for 1 second, and the PCM detected the Intake Air
Heater Relay No. 1 circuit was not activated for more than one second. This problem is not due to a fault in the heater element.
Possible Causes: Intake Air Heater relay control circuit open or shorted to ground Intake Air Heater relay ground circuit is open
Intake Air Heater relay is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0381 1T: Wait To Start Lamp Inoperative Conditions: Key on for 2 seconds, and the PCM detected the Wait To Start control
circuit was not activated for more than two seconds. The PCM expects to detect a voltage drop of 0.5v. Possible Causes: Wait
To Start lamp driver circuit shorted to ground (the lamp will be on continuously) Wait To Start lamp driver circuit open (lamp will
not come on) Wait to Start bulb has failed Wait to Start ignition feed circuit is open, or the Cluster is open PCM has failed.
P0382 1T: Intake Air Heater Relay No. 2 Control Circuit Conditions: Key on for one second; and the PCM detected the Intake Air
Heater Relay 2 Signal circuit was not activated for more than one second. Possible Causes: Intake air heater relay control circuit
is open or shorted to ground Intake air heater relay power circuit is open Intake air heater relay is damaged or has failed PCM
has failed.
P0387 1T: Crankshaft Position Sensor Supply Voltage Low Conditions: Engine started and the PCM did not detect any CKP
Sensor position or engine speed signals. Possible Causes: CKP Sensor signal circuit is open or shorted to ground CKP Sensor
is damaged or has failed PCM has failed.
P0388 1T: Crankshaft Position Sensor Supply Voltage High Conditions: Engine started and the PCM did not detect any CKP
Sensor position or engine speed signals. Possible Causes: CKP Sensor ground circuit is open CKP Sensor signal circuit is
shorted to VREF or to system power CKP Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0401 2T: EGR System Malfunction Conditions: Engine running with throttle open under steady load in closed loop, ECT
Sensor more than 180°F, BTS signal more than 40°F, fuel trim not operating near its limits, then the EGR valve was cycled off to
on and the PCM detected very little change in the O2 signal. Note: This test is repeated up to three (3) times for each vehicle
trip. Possible Causes: EGR valve source vacuum supply line open or blocked EGR exhaust transfer tubes blocked in the
exhaust manifold EGR transducer tube to the transducer is blocked or restricted EGR valve or solenoid transducer is damaged
or has failed PCM has failed.
P0401 2T: EGR System Fault Conditions: Engine running with throttle open under steady load in closed loop, ECT Sensor more
than 180°F, BTS signal more than 0°F, system voltage over 10.5v, fuel trim not operating near its limits, then the EGR valve was
cycled off to on and the PCM detected very little change in the O2 signal. Note: This test is repeated up to three (3) times for
each vehicle trip. Possible Causes: EGR valve control circuit open, grounded or shorted to power EGR exhaust transfer tubes
blocked in the exhaust manifold ASD relay power circuit open to the EGR solenoid EGR valve is damaged or has failed PCM
has failed TSB 18-33-98 contains a repair procedure for this code.
DTC Trouble Code Title, Conditions & Possible Causes:
P0403 1T: EGR Solenoid Circuit Conditions: Engine started; system voltage over 10.5v. The EGR solenoid control circuit was
not in its expected state when requested to operate by the PCM. Possible Causes: EGR solenoid ground circuit is open EGR
solenoid control circuit is open or shorted to ground or to voltage EGR solenoid power circuit is open EGR solenoid is damaged
or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0404 1T: EGR Position Sensor Signal Performance Conditions: Engine started; system voltage over 10.5v and the PCM
detected that the EGR flow (or valve movement) was not what was expected during the test period. Possible Causes: EGR
Sensor signal circuit is open or shorted to ground EGR Sensor 5v supply circuit is open or has high resistance EGR Sensor
ground circuit is open EGR solenoid control circuit has a problem EGR valve actuator loose, sticking, blocked or improperly
grounded EGR Sensor is damaged or has failed Intermittent condition PCM has failed.
P0405 1T: EGR Position Sensor Circuit Low Input Conditions: Key on or engine running; system voltage over 10v. The PCM
detected that the EGR Sensor signal indicated less than 0.1v. Possible Causes: EGR Sensor signal circuit is shorted to ground
or open EGR Sensor VREF (5v) circuit is open or shorted to ground EGR Sensor is damaged (shorted internally) or it has failed
EGR position internal failure PCM has failed.
P0406 1T: EGR Position Sensor Circuit High Input Conditions: Key on or engine running; system voltage over 10.5v. The PCM
detected the EGR Sensor indicated more than 4.89v for 6 seconds. Possible Causes: Intermittent condition EGR Sensor signal
is shorted to VREF (5v) supply circuit or to battery voltage EGR Sensor ground circuit is open EGR Sensor signal circuit is open
EGR Sensor is damaged (it may have an internal open circuit) EGR solenoid failure PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0420 2T: Catalyst Efficiency Below Normal (Bank 1) Conditions: Engine speed at 1200-1700 rpm in closed loop with the
throttle open for over 2 minutes, ECT Sensor more than 147°F, MAP Sensor signal from 15.0- 21.0 in. Hg, and the PCM
detected the switch rate of the rear O2 reached 70% of the switch rate of the front O2. Possible Causes: Air leaks in at the
exhaust manifold or exhaust pipes Base engine problems (high coolant or engine oil consumption) Catalytic converter damaged
or has failed Front O2 older (aged) than the rear O2 (O2 is lazy).
DTC Trouble Code Title, Conditions & Possible Causes:
P0432 2T: Catalyst Efficiency Fault (Bank 2) Conditions: Engine started; then vehicle driven at 1200-1700 rpm at over 20 mph
with the throttle open and steady for 3 minutes, ECT Sensor over 147°F, MAP Sensor at 15.0-21.0" Hg, and the PCM detected
the switch rate of the rear O2 approached the switch rate of the front O2 during the Catalyst Monitor test period. Possible
Causes: Air leaks in at the exhaust manifold or exhaust pipes Base engine problems (high coolant or engine oil consumption)
Catalytic converter damaged or has failed Front O2 older (aged) than the rear O2 (O2 is lazy).
P0440 2T: EVAP Purge System Fault Conditions: Ambient Air Temperature from 39-89°F (4-32C); engine running; Fuel level
over 12%. The PCM detected that the NVLD switch did not close during medium/large leak test. Once this event occurs, the
PCM will increase the amount of vacuum in the system that flows past the purge valve. If the NVLD switch does not close under
these conditions, the PCM will set this code. Possible Causes: EVAP purge valve vacuum supply is leaking or clogged EVAP
purge valve is stuck closed EVAP purge solenoid has failed NVLD assembly (leak detection) is damaged or has failed NVLD
switch circuit is open or the NVLD switch has failed Ground circuit is open PCM has failed.
P0441 2T: EVAP Purge Flow Monitor Fault Conditions: Engine at idle speed in closed loop for 200 seconds, BARO Sensor
signal less than 8,000 feet, ECT Sensor more than 160°F, no Low Fuel, MAP Sensor signal less than 23.7" Hg, and the PCM
did not detect any purge flow through the EVAP system during this test. Possible Causes: EVAP purge solenoid vacuum line
loose, leaking or restricted EVAP purge solenoid stuck leaking, stuck open or stuck closed EVAP purge vacuum line to canister
leaking or disconnected EVAP canister leaking, damaged or has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0442 2T: EVAP System Small Leak Detected Conditions: ECT Sensor from 40-90°F and within 10°F of the BTS input at
startup (cold engine), fuel level more than 1/2 full, engine started, EVAP leak test enabled, and the PCM detected a leak greater
than 0.040 but less than 0.080" somewhere in the EVAP system. Possible Causes: EVAP fuel tank or canister vapor hoses
leaking or damaged EVAP system component leaking, damaged or has failed Fuel tank cap is loose, or the cap release
pressure is incorrect Leak detection pump damaged or leaking.
DTC Trouble Code Title, Conditions & Possible Causes:
P0443 1T: EVAP Purge Solenoid Circuit Fault Conditions: Engine started; system voltage over 10v, EVAP Purge solenoid
commanded ON and off, and the PCM detected an unexpected voltage condition at the EVAP purge solenoid for 3 seconds.
Note: The solenoid resistance at 68°F is from 25-35 ohms. Possible Causes: EVAP purge solenoid control circuit open or
shorted to ground EVAP purge solenoid power circuit open EVAP purge solenoid is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0452 1T: NVLD Pressure Switch Sense Circuit Low Input Conditions: Engine started; and immediately after the engine is
running. The PCM activates the NVLD solenoid to test the NVLD switch circuit. If the switch is not open, the PCM sets this code.
Possible Causes: EVAP purge solenoid control circuit is shorted to ground EVAP purge solenoid is leaking or it is stuck in open
position NVLD assembly or NVLD switch is damaged or it has failed NVLD switch signal circuit is shorted to ground PCM has
failed.
P0453 1T: NVLD Pressure Switch Sense Circuit High Input Conditions: Engine started; and immediately after the engine is
running, the PCM activates the NVLD solenoid to test the NVLD switch circuit. If the switch does not close under these
conditions, this code is set. Possible Causes: NVLD assembly ground circuit is open NVLD switch signal circuit is open or
shorted to power (B+) or to NVLD solenoid control circuit NVLD assembly or switch is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0455 2T: EVAP Large Leak Detected Conditions: Ambient Air Temperature from 39-89°F at engine startup, engine running
under closed loop conditions, Fuel Level over 12%, then with the EVAP purge solenoid enabled (to pull vacuum into the system
to close the NVLD switch) and the EVAP "small leak" test maturing, the PCM turns "off" the EVAP purge solenoid once the
NVLD switch closes. If the NVLD switch reopens before a calibrated amount of time expires, a "large" leak in the system is
detected (larger than 0.080 in.). Possible Causes: EVAP purge solenoid is damaged or it has failed Fuel tank cap is damaged,
missing or the wrong part number NVLD switch is damaged or it has failed.
P0455 2T: EVAP Large Leak (0.80") Detected Conditions: ECT Sensor from 40-90°F and within 10°F of the BTS input at startup
(cold startup), fuel level more than 1/2 full, engine started, EVAP leak test enabled, and the PCM detected a leak greater than
0.080 existed somewhere in the EVAP system. Possible Causes: EVAP fuel tank or canister vapor hoses leaking or damaged
EVAP system component leaking, fuel cap loose or missing Leak detection pump damaged or leaking.
DTC Trouble Code Title, Conditions & Possible Causes:
P0456 2T: EVAP Small Leak (0.020") Detected Conditions: ECT Sensor from 40-90°F and within 10°F of BTS Sensor at startup,
Fuel Level from 15-85%, engine started, EVAP leak test enabled, and the PCM detected a leak greater than 0.020 but less than
0.040" somewhere in the EVAP system. Possible Causes: EVAP fuel tank or canister vapor hoses leaking or damaged EVAP
system component leaking, fuel cap loose or missing Leak detection pump damaged or leaking.
P0456 2T: EVAP System Small Leak Detected Conditions: Ambient Air Temperature from 39-109°F at engine startup, engine
running under closed loop conditions, Fuel Level below 88%, then with the EVAP system sealed, the PCM monitors the NVLD
switch. If the NVLD switch does not close within a calibrated amount of time expires, a "small" leak in the EVAP system was
detected. Possible Causes: Fuel tank cap is damaged, loose or the wrong part number Small leak present somewhere in the
EVAP system.
DTC Trouble Code Title, Conditions & Possible Causes:
P0460 1T: Fuel Level Sending No Change Over Miles Conditions: Engine started; fuel level less than 15% or more than 85%,
and the PCM detected a Low Fuel condition that the fuel level was less than 15% for 120 miles, or that the fuel level remained at
more than 85% and did not change by at least 10% after traveling over 100 miles. Possible Causes: Fuel level sending unit
signal circuit open or shorted to ground Fuel level sending unit ground circuit is open Fuel level sensing unit is damaged or the
fuel tank is damaged.
DTC Trouble Code Title, Conditions & Possible Causes:
P0462 1T: Fuel Level Sensing Unit Low Input Conditions: Key on or engine running; system voltage over 10.5v and the PCM
detected the fuel level sensing unit signal indicated less than 0.98v, condition met for 200 seconds. No MIL. Possible Causes:
Fuel level sending unit signal circuit shorted to Sensor ground Fuel level sending unit signal circuit shorted to chassis ground
Fuel level sensing unit is damaged or the fuel tank is damaged BCM or PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0463 1T: Fuel Level Sending Unit High Input Conditions: Key on or engine running; system voltage over 10.5v and the PCM
detected the fuel level sensing unit signal indicated more than 4.90v, condition met for 200 seconds. No MIL. Possible Causes:
Fuel level sending unit signal circuit shorted to Sensor or chassis ground Fuel level sensing unit is damaged or the fuel tank is
damaged BCM or PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0480 1T: Low Speed (No. 1) Fan Relay Control Circuit Conditions: Key on or engine running; and the PCM detected an
unexpected low or high voltage condition on the Low Speed Fan Relay control circuit. Possible Causes: LFAN relay power
circuit is open from the relay to fused power LFAN relay control circuit is open or shorted to chassis ground LFAN relay is
damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0481 1T: High Speed (No. 2) Fan Relay Control Circuit Conditions: Key on or engine running; and the PCM detected an
unexpected low or high voltage condition (open or shorted condition) on the High Speed Fan Relay circuit. Possible Causes:
HFAN relay power circuit is open from the relay to fused power HFAN relay control circuit is open or shorted to chassis ground
Fan relay(s) failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0498 1T: NVLD Canister Vent Solenoid Circuit Low Conditions: Key on or engine running; and the PCM detected an
unexpected low voltage condition on the Natural Vacuum Leak Detection (NVLD) control circuit during the CCM test period.
Possible Causes: NVLD canister vent solenoid control circuit is shorted to ground NVLD canister vent solenoid is damaged or it
has failed PCM has failed.
P0499 1T: NVLD Canister Vent Solenoid Circuit High Conditions: Key on or engine running. The PCM detected an open or
unexpected high voltage condition on the Natural Vacuum Leak Detection (NVLD) circuit. Possible Causes: NVLD canister vent
solenoid control circuit is open or is shorted to power NVLD canister vent solenoid ground circuit is open NVLD canister vent
solenoid is damaged or it has failed PCM has failed.

 

OBD II Trouble Code Lists

DTC Trouble Code Title, Conditions & Possible Causes:
P0500 1T: Vehicle Speed Sensor Circuit Fault Conditions: Engine started; engine runtime over 31 seconds, ECT Sensor more
than 180°F, transaxle not in Park or Neutral, brakes not applied, engine speed over 1800 rpm, MAP Sensor less than 11" Hg,
and the PCM did not detect a VSS signal from the TCM for over 11 seconds. Possible Causes: VSS or OSS signal circuit to the
PCM is open or shorted to ground VSS or OSS power circuit (8v) is open or shorted to ground VSS or OSS ground circuit to the
PCM is open Speedometer pinion or the VSS is damaged or has failed.
P0500 2T: Vehicle Speed Sensor Circuit Fault Conditions: Engine started; engine speed from 1024-2784 rpm, engine boost
more than 7 psi, and the PCM did not detect a VSS signal from the CAB module for over 15 seconds during testing. Possible
Causes: CAB circuit from the CAB to PCM is open or it is shorted OSS signal circuit to the TCM is open or shorted to ground
OSS is damaged or has failed TCM or PCM Diesel has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0501 2T: Vehicle Speed Sensor Performance Conditions: Engine started; vehicle driven at over 1500 rpm for 10 seconds, gear
selector not in Park or Neutral (or clutch is not depressed on M/T); brakes not applied. The PCM (or ECM: Liberty with Diesel)
did not receive any VSS signals from the TCM (BCM: Liberty) for 11 seconds for 2 consecutive trips. 3 good trips required to
turn off MIL. Possible Causes: Check for any ABS/RWAL or TCM codes related to the VSS, VSS connector is damaged, open
or it is shorted VSS signal is open, shorted to ground or shorted to power Incorrect tire circumference ABS/RWAL controller,
BCM, ECM, TCM or PCM has failed.
P0501 1T: Vehicle Speed Sensor Signal Range/Performance Conditions: Engine started; vehicle driven to a speed over 20 mph
for 2 seconds (as indicated by the CCD Bus signal to the PCM), ECM vehicle speed signal less than 10 mph, and the PCM did
not receive a CAB vehicle speed signal during the CCM Rationality test. Possible Causes: Check for a CAB controller code
related to the VSS signal CAB (ABS) controller has failed VSS signal is open, shorted to ground or shorted to power ECM or
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0505 2T: IAC Idle Air Control Motor Circuit Conditions: Engine started; system voltage over 11.5v and the PCM detected an
unexpected voltage condition on one or more of the IAC motor circuits for 2.75 seconds (exc. Viper) or for 100ms (Viper), with
the IAC motor active. Possible Causes: Stepper motor Coil No. 1, 2, 3 or 4 circuit open or shorted to ground Stepper motor coil
circuit(s) shorted to system power (B+) Stepper motor is damaged or has failed PCM has failed.
P0506 1T: Idle Speed Low Performance Conditions: Engine running at idle speed in closed loop, and the PCM detected the
actual idle speed was not within the expected low idle speed limit when compared to the target idle speed limit. Possible
Causes: Air induction system restrictions (clogged air filter, etc.) Idle air control passage is clogged or dirty (clean and retest)
Throttle body or linkage is binding, damaged or sticking.
DTC Trouble Code Title, Conditions & Possible Causes:
P0507 1T: Idle Speed High Performance Conditions: No CKP, ECT, MAF, MAP or VSS codes set, engine started, engine
running at idle speed, BTS Sensor from 0-19.4F, ECT Sensor from 158-266F, MAF Sensor under 250 mg, and the PCM
detected the Actual speed was 200 rpm above the Target speed for 7 seconds. Possible Causes: Idle air control passage is
clogged or dirty (clean and retest) Throttle body or linkage is binding, damaged or sticking Vacuum leaks in the engine or PCV
system components Intermittent condition PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0508 2T: Idle Air Control Motor Sense Circuit Low Input Conditions: Engine started; system voltage over 10.5v; IAC motor
operating. The PCM detected the IAC Motor Sense circuit current was less than 175mA during the CCM test period. Possible
Causes: IAC motor driver circuit is open or shorted to ground IAC motor sense circuit is open or shorted to ground IAC motor is
damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0509 2T: Idle Air Control Motor Circuit High Conditions: Engine started; system voltage over 10.5v, IAC motor activated, and
the PCM detected a high voltage on one or more of the IAC motor circuits (over 980mA) during the CCM test period. Possible
Causes: IAC motor driver circuit is shorted to power IAC motor sense circuit is shorted to power IAC motor is damaged or it has
failed PCM has failed.
P0513 1T: PCM Invalid SKIM Key Detected Conditions: Key on, and the PCM detected an invalid Sentry Key Immobilizer key
had been inserted into the ignition key assembly. Possible Causes: Incorrect VIN in the PCM No communication between the
PCM and the SKIM, SKIM trouble codes present (check for any SKIM codes) Valid SKIM key not present VIN not programmed
into the PCM, PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0516 1T: Battery Temperature Sensor Circuit Low Input Conditions: Key on or engine running; and the PCM detected a Battery
Temperature Sensor signal that indicated less than 0.10v (exc. Ram, Liberty) or less than 0.039v (Ram, Liberty). 3 good trips
required to turn off MIL. Possible Causes: BTS signal circuit is shorted to Sensor or chassis ground BTS assembly is damaged
or it has failed PCM has failed.
P0517 1T: Battery Temperature Sensor Circuit High Input Conditions: Key on or engine running; and the PCM detected a
Battery Temperature Sensor signal that indicated more than 4.8v (exc. Ram, Liberty) or more than 4.94v (Ram, Liberty).
Possible Causes: BTS signal circuit is shorted to VREF (5v) BTS signal circuit is open or the BTS ground circuit is open BTS
assembly is damaged or it has failed PCM has failed.
P0519 2T: IAC Idle Air Performance Conditions: DTC P0106, P0107, P0108, P0121, P0122 and P0123 not set, engine started,
engine running with the gear selector indicating Drive position, and the PCM detected the engine idle speed was not within 200
rpm of the high idle limit or within 100 rpm of the low idle limit when compared to the Target Idle Speed limit for 40 seconds.
Possible Causes: Idle air control passage is clogged or dirty (clean and retest) Throttle body or linkage is binding, damaged or
sticking Vacuum leaks in the engine or PCV system components.
DTC Trouble Code Title, Conditions & Possible Causes:
P0522 1T: Engine Oil Pressure Sensor Circuit Low Input Conditions: Key on or engine running; system voltage more than 10.4v,
and the PCM detected the Oil Pressure Sensor signal was less than 0.10v. Possible Causes: Check for multiple trouble codes
set related to this circuit Oil pressure Sensor signal circuit is open or shorted to ground Oil pressure Sensor VREF circuit is open
Oil pressure Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0522 1T: Engine Oil Pressure Sensor Rationality Conditions: Key on (engine not started), engine speed (rpm) indicating 0 rpm,
and the PCM detected an engine oil pressure reading not within calibrated range. Possible Causes: Oil pressure Sensor signal
circuit is open Oil pressure Sensor signal circuit is shorted to ground Oil pressure Sensor is damaged or has failed PCM has
failed.
P0523 1T: Engine Oil Pressure Sensor Rationality Conditions: Key on (engine not started), engine speed (rpm) indicating 0 rpm,
and the PCM detected an engine oil pressure reading. Possible Causes: Oil pressure Sensor signal circuit is open Oil pressure
Sensor signal circuit is shorted to ground Oil pressure Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0523 1T: Engine Oil Pressure Sensor Circuit High Input Conditions: Key on or engine running; system voltage more than
10.4v, and the PCM detected the Oil Pressure Sensor signal indicated more than 4.90v during the CCM test. Possible Causes:
Oil pressure Sensor signal circuit is shorted to VREF Oil pressure Sensor ground circuit is open Oil pressure Sensor is damaged
or has failed PCM has failed.
P0524 1T: Engine Oil Pressure Sensor Signal Too Low Conditions: Key on or engine running; system voltage more than 10.4v,
and the PCM detected a signal from the Oil Pressure Sensor that indicated the engine oil pressure was too low. Possible
Causes: Engine oil level is very low Oil pressure Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0532 1T: Air Conditioning Pressure Sensor Circuit Low Input Conditions: Engine running with the A/C relay energized. The
PCM detected the signal from the A/C Pressure Sensor indicated less than 0.58v for over 2.6 seconds during the CCM test
period. Possible Causes: A/C pressure Sensor 5v power supply (VREF) circuit is open or is shorted to ground A/C pressure
Sensor signal circuit is shorted to ground or to Sensor ground circuit A/C pressure Sensor is damaged or it has failed Front A/C
control module damaged or has failed PCM has failed.
P0533 1T: Air Conditioning Pressure Sensor Circuit High Input Conditions: Engine running with the A/C relay energized, and the
PCM detected the signal from the A/C Pressure Sensor indicated less than 4.92v for over 2.6 seconds during the CCM test
period. Possible Causes: A/C pressure Sensor signal circuit is shorted to 5v VREF power A/C pressure Sensor signal circuit or
ground circuit is open A/C pressure Sensor is damaged or it has failed Front A/C control module is damaged or has failed PCM
has failed.
P0545 1T: Air Conditioning Clutch Circuit Failure Conditions: Key on or engine running; and the PCM detected an unexpected
voltage condition on the A/C clutch control circuit in the CCM test. Possible Causes: A/C clutch control circuit is open between
the clutch and PCM A/C clutch control circuit is shorted to ground A/C clutch power circuit is open A/C clutch or PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0551 1T: Power Steering Pressure Switch Circuit Failure Conditions: Vehicle driven at more than 56 mph for more than 30
seconds and the PCM detected a high voltage input on the PSPS circuit (pressure exceeds 500 psi). This is a normally open
switch. Possible Causes: PSPS sense circuit is shorted to ground PSPS is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0562 1T: Battery Sense Circuit Low Input Conditions: Engine running at a speed over 380 rpm, and the PCM detected the
Battery Sense circuit voltage indicated one volt less than the Charging system "goal" (11.50v) for 13.47 seconds. Possible
Causes: Battery sense circuit has a high resistance condition Generator ground circuit has a high resistance condition
Generator field ground circuit is open Generator field control circuit is open or shorted to ground Generator is damaged or it has
failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0562 1T: Charging System Voltage Low Input Conditions: Engine started; engine speed over 1000 rpm during testing, and the
PCM detected the system voltage was less than 6.0v at any time. Possible Causes: Battery connections corroded (high
resistance) or loose Ignition system voltage circuit is open at the PCM terminals Generator is damaged or has failed (output is
too low) PCM has failed.
P0563 1T: Battery Sense Circuit High Input Conditions: Engine running at a speed over 380 rpm, and the PCM detected the
Battery Sense circuit voltage indicated 1v higher than the Charging system "goal" during the CCM test. Possible Causes:
Generator field control circuit is shorted to system power (B+) Generator is damaged or it has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0563 1T: Charging System Voltage High Input Conditions: Engine started; engine speed over 1000 rpm during the test period,
and the PCM detected the system voltage was more than 17.0v at any time during the CCM test. Possible Causes: Generator is
damaged or has failed (output is too high) PCM has failed.
P0572 1T: Brake Switch No. 1 Signal Circuit Failure Conditions: Vehicle driven at over 55 mph for 1 minute, and then returned
to idle speed, test performed at least 10 times, and the PCM did not detect any change in the Brake Switch No. 1 signal.
Possible Causes: Brake switch signal circuit to open or shorted to ground Brake switch power circuit is open Brake switch is
damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0573 1T: Brake Switch Signal No. 2 Circuit Malfunction Conditions: Engine started; engine running and the PCM did not detect
any Brake Switch No. 2 signals on the CCD Bus circuit during the test. Possible Causes: Brake switch signal to the PCM is
missing (circuit problem) CCD Bus circuit is open or shorted to ground CCD Bus circuit is shorted to system power Generator
field control circuit shorted to battery voltage PCM has failed.
P0575 1T: Cruise Control Switch Signal Low Input Conditions: Engine started; engine running and the PCM detected a
continuous "low" voltage condition on the Cruise Control switch circuit. Possible Causes: C/C switch signal shorted to ground
between switch and PCM C/C clockspring is shorted to ground C/C switch is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0576 1T: Cruise Control Switch Signal High Input Conditions: Engine started; engine running and the PCM detected a
continuous "high" voltage condition on the Cruise Control switch circuit. Possible Causes: C/C switch circuit is open or shorted to
VREF or system power C/C switch or clockspring ground circuit is open C/C switch is damaged or has failed PCM has failed.
P0577 1T: Cruise Control Switch Signal High Input Conditions: Engine started; engine running and the PCM detected a
continuous "high" voltage condition on the Cruise Control switch circuit. Possible Causes: C/C switch circuit is open or shorted to
VREF or system power C/C switch or clockspring ground circuit is open C/C switch is damaged or has failed PCM has failed.
P0579 1T: Speed Control Switch No. 1 Performance Conditions: Engine started; and the PCM detected a continuous invalid
voltage condition on the Speed Control Switch No. 1 signal. Possible Causes: S/C switch signal circuit is shorted to chassis or
Sensor ground S/C switch signal circuit is open or shorted to system power S/C switch is damaged or it has failed Sensor
ground circuit is open PCM has failed.
P0580 1T: Speed Control Switch No. 1 Circuit Low Input Conditions: Key on or engine started; system voltage over 10.0v and
the PCM detected the Speed Control Switch No. 1 signal indicated less than 0.43v (exc. Liberty) or 0.60v (Liberty) for 2 minutes.
3 good trips required to turn off MIL. Possible Causes: Intermittent condition S/C switch signal circuit is shorted to chassis or
Sensor ground S/C On/Off switch is damaged or it has failed S/C Resume/Accel switch is damaged or it has failed PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0580 1T: Speed Control Switch No. 1 Circuit Low Input Conditions: Key on. The PCM detected the Speed Control Switch No. 1
signal is below the minimum acceptable voltage. Possible Causes: S/C switch No. 1 signal circuit is shorted to S/C switch return
circuit S/C switch No. 1 signal circuit is shorted to ground Clockspring is damaged or it has failed Speed control switch No. 1 has
failed PCM has failed.
P0581 1T: Speed Control Switch No. 1 Circuit High Input Conditions: Engine started; system voltage over 10v and the PCM
detected an open or shorted condition, or above maximum acceptable S/C switch voltage, in the Speed Control Switch signal
circuit. Possible Causes: S/C switch No.1 signal circuit is shorted to system power (B+) S/C switch ground circuit is open S/C
switch signal circuit is open between PCM and clockspring S/C Sensor ground circuit is open between PCM and clockspring or
clockspring and S/C switch Clockspring has failed S/C switch (one or more) is damaged or has failed PCM has failed.
P0582 1T: Speed Control Vacuum Solenoid Circuit Malfunction Conditions: Ignition on or engine started; Speed Control (S/C)
system activated, and the PCM detected an open or short to voltage condition on the S/C Vacuum solenoid circuit during the
CCM test period. Possible Causes: S/C supply circuit is open or is short to ground or to battery voltage S/C vacuum solenoid
control circuit is open S/C vacuum solenoid control circuit is shorted to ground S/C vacuum solenoid is damaged or has failed
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0586 1T: Speed Control Vent Solenoid Circuit Malfunction Conditions: Engine started; battery voltage over 10v; Speed Control
(S/C) system activated. The PCM detected an unexpected voltage condition on the S/C Vent solenoid circuit during the CCM
test period. Possible Causes: S/C supply circuit is open or is short to ground S/C vent solenoid control circuit is open S/C vent
solenoid control circuit is shorted to ground S/C vent solenoid is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0594 1T Speed Control Servo Power Circuit Malfunction Conditions: Engine started; Speed Control (S/C) system: activated.
The PCM detected an unexpected voltage condition on the S/C Vent solenoid circuit during the CCM test period. Possible
Causes: S/C solenoid or vent solenoid has failed Brake switch is damaged or it has failed S/C brake switch circuit is open or it is
shorted to ground S/C power circuit is open or it is shorted to ground PCM has failed.
P0600 1T: PCM Internal Failure, No SPI Communications Conditions: Key on, system voltage over 10.5v and the PCM detected
the initial serial data communications attempt failed 8 times in succession. Possible Causes: Turn the key off. Remove the PCM
connector(s) and inspect the wiring harness connector pins and PCM pins for damaged, bent or missing pins. If any problems
are located, make the repair and then perform the PCM Reset function. If this code resets after the repairs are made, the PCM
has failed. PCM needs to be replaced, and then reprogrammed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0601 1T: PCM Random Access Memory Failure, Self-Test Failed Conditions: Key on, system voltage over 10.5v and the PCM
detected the Random Access Memory (RAM) test failed in the initial Self- Test. Possible Causes: PCM needs to be replaced,
and then reprogrammed.
P0602 1T: PCM Fueling Calibration Conditions: Key on or engine starting, and the PCM detected one or more parameters was
out-of-range for over one (1) second during testing. Possible Causes: PCM needs to be replaced, and then reprogrammed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0604 1T: PCM/TCM Random Access Memory Failure, Self-Test Failed Conditions: Key on, system voltage over 10.5v and the
TCM detected the Random Access Memory (RAM) test failed during the initial Self- Test. Possible Causes: TCM needs to be
replaced, and then reprogrammed.
P0605 1T: PCM/TCM Random Access Memory Failure, Self-Test Failed Conditions: Key on, system voltage over 10.5v and the
TCM detected the Read Only Memory (ROM) test failed during the initial Self-Test. Possible Causes: TCM needs to be
replaced, and then reprogrammed.
P0606 1T: Powertrain Control Module Malfunction Conditions: Key on or engine running; and the PCM detected an internal
malfunction had occurred during the initialization step. Possible Causes: PCM needs to be replaced, and then reprogrammed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0613 1T: PCM/TCM Internal Failure Conditions: Key on, system voltage over 10.5v and the TCM detected an internal failure
(possible open condition in the TCM ground circuit). Possible Causes: Turn the key off. Remove the TCM connector(s) and
inspect the wiring harness connector pins and TCM pins for damaged, bent or missing pins. Make repairs as needed. Then
perform the TCM Reset function. If the code resets, the PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0622 1T: Generator Field Control Circuit Malfunction Conditions: Engine running. The PCM detected the Generator Field
control circuit had malfunctioned (PCM tries to regulate the generator field with no result). Possible Causes: Generator field
control circuit is open or is shorted to ground Generator field control circuit is shorted to system power (B+) Generator field
ground circuit is open Generator is damaged or PCM has failed PCM has failed.
P0627 1T: Fuel Pump Relay Control Circuit Malfunction Conditions: Engine started; system voltage over 10.5v. The PCM
detected an unexpected voltage condition (open or short) on the Fuel Pump relay control circuit during the CCM test period.
Possible Causes: Fuel pump relay control circuit is open or is shorted to ground Fuel pump relay control circuit is shorted to
system power (B+) Fuel pump relay power circuit (fused ignition) circuit is open Fuel pump relay is damaged or it has failed
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes.
P0628 1T: Fuel Pump Relay Control Circuit Malfunction Conditions: Engine started; system voltage over 10.5v and the PCM
detected an unexpected voltage condition on the Fuel Pump relay control circuit during the CCM test period. Possible Causes:
Fuel pump relay circuit is open, shorted to ground or to power Fuel pump relay power circuit (fused ignition) circuit is open Fuel
pump relay is damaged or it has failed PCM has failed.
P0630 1T: VIN not programmed into the PCM Conditions: Key on, and the PCM determined that the Vehicle Identification
Number (VIN) had not been programmed into its memory. Possible Causes: Reprogram the correct VIN into the PCM, PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0632 1T: Odometer Not Programmed into the PCM Conditions: Key on, and the PCM detected the vehicle mileage had not
been programmed into memory. Possible Causes: Reprogram the correct mileage into the PCM, PCM has failed.
P0633 1T: SKIM Key Not Programmed into the PCM Conditions: Key on, and the PCM determined that the Security Key
Immobilizer (SKIM) information had not been programmed into its memory. Possible Causes: Reprogram the SKIM key into the
PCM, PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0645 1T: A/C Clutch Relay Circuit Malfunction Conditions: Engine started; system voltage over 10.0v, A/C switch "on". The
PCM detected an unexpected voltage condition (open or shorted condition) on the A/C Clutch relay control circuit during the
CCM test. Possible Causes: Internally fused ignition switch output circuit is faulty A/C relay clutch control circuit is open or it is
shorted to ground A/C relay clutch power supply (fused ignition) circuit is open A/C relay is damaged or it has failed PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0660 1T: Manifold Tune Valve Solenoid Circuit Malfunction Conditions: Engine started; ASD relay "on", system voltage over
10.0v, and the PCM detected an unexpected voltage condition on the Manifold Tune Valve (MTV) solenoid control circuit.
Possible Causes: Fused B+ circuit has failed MTV solenoid/relay circuit is open or it is shorted to ground MTV solenoid/relay
circuit is shorted to power MTV solenoid/relay ground circuit is open MTV solenoid/relay is damaged or it has failed PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0685 1T: ASD Relay Control Circuit Malfunction Conditions: Key on; system voltage over 10.0v. The PCM detected an
unexpected voltage condition (open or short) on the Automatic Shutdown (ASD) relay control circuit during the CCM test period
(ASD actual state is not equal to the desired state). 3 good trips are required to turn off MIL. P0688 may also set. Possible
Causes: Fused B+ circuit faults ASD relay connector is damaged, loose or shorted ASD relay control circuit is open or it is
shorted to ground ASD power supply (fused B+) circuit is open ASD relay is damaged, has high resistance, or it has failed PCM
has failed.

 

DTC Trouble Code Title, Conditions & Possible Causes:
P0688 1T: ASD Relay Sense Circuit Low Conditions: Key on, ASD relay energized, system voltage over 10.0v, and the PCM did
not detect any voltage on the Automatic Shutdown (ASD) Sense circuit during the CCM test period. Possible Causes: ASD relay
output circuit is open ASD power supply (fused B+) circuit is open ASD relay is damaged or it has failed Problem in fuse/relay
center PCM no start condition PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes.
P0700 2T: TCM Automatic Transmission Control System Malfunction Conditions: Ignition on or engine started. The PCM
received a message over the CCD Bus from the Transmission Control Module (TCM) that it had detected a problem and set a
trouble code in memory. Possible Causes: The presence of this code means the TCM detected a problem TCM related Sensor
has solenoid is damaged or has failed .This code is for information only - check for other TCM codes TCM or PCM has failed.
P0703 1T: A/T Brake Switch Sense Circuit Malfunction Conditions: Engine started; vehicle driven to over 20 mph with the TP
Sensor over 0.02v for 6 seconds, followed by a deceleration period to 0 mph at least 16 times, and the PCM detected the Brake
switch signal status was not correct during the acceleration/deceleration periods. Possible Causes: Brake switch signal circuit or
the switch ground circuit is open Brake switch is damaged, out of adjustment or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0705 1T: A/T Check Shifter Signal Circuit Malfunction Conditions: Key on or engine running; and the PCM detected at least
three occurrences of an invalid TR Sensor PRNDL signal for over 100 ms. Possible Causes: TR1, T3, T41 or T42 sense circuit
is open TR1, T3, T41 or T42 sense circuit is shorted to ground TR1, T3, T41 or T42 Sensor circuit is shorted to system power
Transmission Range Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0711 1T: A/T Transmission Fluid Temperature Sensor Signal - No Rise After Startup Conditions: Engine started; engine
runtime over 20 minutes, and the PCM detected the TFT Sensor signal did not increase at least 16°F; or the PCM detected the
TFT Sensor indicated more than 260°F with the ECT Sensor signal indicating less than 100°F during the CCM test. Possible
Causes: TFT Sensor signal has an intermittent high resistance condition TFT Sensor is damaged, skewed or has drifted out of
range PCM has failed.
P0712 1T: A/T Transmission Fluid Temperature Sensor Low Input Conditions: Engine started and the PCM detected the TFT
Sensor signal was under 1.55v for 2.2 seconds. Possible Causes: TFT Sensor signal circuit is shorted to ground TFT Sensor is
damaged or has failed (it may be shorted) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0713 1T: A/T Transmission Fluid Temperature Sensor High Input Conditions: Engine started and the PCM detected the TFT
Sensor signal was over 3.76v for 2.2 seconds. Possible Causes: TFT Sensor signal circuit is open between the Sensor and
PCM TFT Sensor ground circuit is open between Sensor and PCM TFT Sensor is damaged or has failed (it may be open
internally) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0715 1T: A/T Input Speed Sensor Circuit Malfunction Conditions: Vehicle driven in 1st, 2nd or 3rd gear with Output Speed
Sensor (OSS) signals present, and the PCM did not detect any ISS signals less for 1 second with the vehicle in 2nd gear.
Possible Causes: ISS signal (+) circuit is open, shorted to ground or to power ISS signal (-) circuit is open, shorted to ground or
to power ISS is damaged or has failed (it may be open internally) Overdrive clutch drum lugs are damaged or missing PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0720 1T: A/T Output Speed Sensor - Low Output above 15 MPH Conditions: Engine started; vehicle driven to a speed over 15
mph, and the PCM detected the OSS signal was less than 60 RPM for 2.6 seconds. Possible Causes: OSS signal (+) circuit is
open, shorted to ground or to power OSS signal (-) circuit is open, shorted to ground or to power OSS is damaged or has failed
(it may be open internally) Parking pawl lugs damaged or missing PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0725 1T: A/T Engine Speed Sensor Circuit Malfunction Conditions: Engine running; and the PCM detected an Engine Speed
Sensor reading of less than 390 rpm or more than 8000 rpm occurred for 2 seconds during the CCM test. Possible Causes:
Check for trouble codes related to the CKP Sensor CKP Sensor signal circuit open, shorted to ground or to power CKP Sensor
is damaged or has failed (open or shorted) Intermittent wiring or connector problems PCM has failed.
P0731 1T: A/T Additional Gear Ratio Error In First Gear Conditions: Vehicle driven to a speed of 4-37 mph at more than 500
rpm, gear selector in 1 Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes: U/D and 2/4 pressures less than 105 psi U/D or L/R clutch volume indexes out of specification L/R
accumulator seals are damaged or L/R switch valve stuck L/R switch valve stuck in first gear position Transmission has an
internal leak (U/D or other seals leaking).
DTC Trouble Code Title, Conditions & Possible Causes:
P0732 1T: A/T Additional Gear Ratio Error In Second Gear Conditions: Vehicle driven to a speed of 4-37 mph at more than 500
rpm, gear selector in 2nd Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes: U/D and L/R pressures less than 95 psi at 2000 rpm U/D or 2/4 clutch volume indexes out of specification L/R
accumulator seals are damaged or L/R switch valve stuck Transmission has an internal leak (U/D or 2/4 seals leaking) L/R
switch valve stuck in first gear position.
P0733 1T: A/T Additional Gear Ratio Error In Third Gear Conditions: Vehicle driven to a speed of 4-37 mph at more than 500
rpm, gear selector in 3rd Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes: O/D and U/D pressures less than 75 psi O/D or U/D clutch volume indexes out of specification O/D
accumulator seals are damaged L/R switch valve stuck in first gear position Transmission has an internal leak (U/D seals
leaking).
DTC Trouble Code Title, Conditions & Possible Causes:
P0734 1T: A/T Additional Gear Ratio Error In Fourth Gear Conditions: Vehicle driven to a speed of 4-37 mph at more than 500
rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Possible Causes: Customer may complain of intermittent 4th gear operation O/D and 2/4 pressures less than 75 psi O/D or 2/4
clutch volume indexes out of specification O/D accumulator seals are damaged Transmission enters "limp in" mode running in
4th gear.
P0735 1T: A/T Gear Ratio Error Fourth Prime Conditions: Vehicle driven any forward Gear, and the TCM detected the ratio of
the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes). Possible Causes:
Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
Transmission has internal problems or damage present.
DTC Trouble Code Title, Conditions & Possible Causes:
P0736 1T: A/T Additional Gear Ratio Error In Reverse Gear Conditions: Vehicle driven in Reverse Gear at more than 500 rpm,
and the PCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio during the test.
Possible Causes: Customer may complain of intermittent Reverse gear operation Related Gear Ratio trouble codes may be
stored Transmission has internal problems or damage present.
P0740 1T: A/T Torque Converter Clutch - No RPM Drop At Lockup Conditions: Engine started; vehicle driven at over 1750 rpm
at 50 mph for 20 seconds, TCC command at 100%, and the PCM detected the engine speed was not within 60 rpm of ISS
speed with the TP angle less than 30 degrees. The test must fail 3 times on one trip to set a code. Possible Causes: Internal
transmission component fault (Input or Reaction shaft) Internal transmission leakage (valve body leaking or seal rings)
Converter clutch valve or clutch timing valve is sticking TCC assembly has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0743 1T A/T Torque Converter Clutch Solenoid Circuit Failure Conditions: Key on or engine started, and the PCM: detected an
unexpected voltage condition on the TCC solenoid control circuit during the test. Possible Causes: TCC power circuit is open
between the solenoid and Fused B+ TCC solenoid control circuit is open or shorted to ground TCC solenoid control circuit is
shorted to system power TCC solenoid is damaged or has failed PCM has failed.
P0748 1T: A/T Governor Pressure Solenoid/Transmission Relay Fault Conditions: Engine started, and the PCM detected an
unexpected voltage on the GPS control circuit. This solenoid is used to control governor pressure so the transmission can
determine shift points. Possible Causes: A/T transmission relay power circuit is open (test power to B+) A/T transmission relay is
damaged or has failed Governor pressure solenoid circuit is open or shorted to ground Governor pressure solenoid is damaged
or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0750 1T: A/T Low/Reverse Solenoid Circuit Failure Conditions: Key on, and the PCM detected an unexpected voltage
condition on the L/R Solenoid control circuit after the solenoid was enabled and disabled (the PCM checks for an inductive
spike). Possible Causes: L/R solenoid control circuit is open or shorted to ground L/R solenoid control circuit is shorted to
system power L/R Solenoid is damaged or has failed TCM or PCM has failed.
P0751 1T: A/T Overdrive Switch Pressed Low For Over 5 Minutes Conditions: Engine started; engine runtime over 10 seconds
and the PCM detected the Overdrive Off Switch indicated "low" for over 5 minutes. Possible Causes: Overdrive Switch Off"
circuit is shorted to ground Overdrive Switch is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0753 1T: A/T 3-4 Solenoid/Transmission Relay Circuit Failure Conditions: Key on or engine started, and the PCM detected an
unexpected voltage condition on the 3-4 Solenoid control circuit during the test. Possible Causes: 3-4 Solenoid control circuit is
open or shorted to ground 3-4 Solenoid is damaged or has failed Transmission relay power circuit is open (check the fused B+)
Transmission relay is damaged or has failed PCM has failed.
P0755 1T: A/T 2/4 Solenoid Circuit Failure Conditions: Key on or engine running; and the PCM detected an unexpected voltage
condition on the2/4 Solenoid control circuit immediately the solenoid was energized or de-energized. The PCM checks for an
inductive spike when the solenoid is turned "on" and then "off". Possible Causes: 2/4 Solenoid control circuit is open or shorted
to ground 2/4 Solenoid control circuit is shorted to system power 2/4 Solenoid is damaged or has failed TCM or PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0760 1T: A/T Overdrive Solenoid Circuit Failure Conditions: Engine started, and the PCM detected an unexpected voltage
condition on the Overdrive solenoid control circuit. The solenoids are tested at power-up and then ever 10 seconds. Possible
Causes: O/D Solenoid control circuit is open, shorted to ground or power O/D Solenoid is damaged or has failed TCM relay
power circuit to O/D solenoid is open (loss of B+) TCM or PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0765 1T: A/T Underdrive Solenoid Circuit Malfunction Conditions: Key on or engine running; and the PCM detected an
unexpected voltage condition on the U/D Solenoid control circuit immediately after a Gear Ratio or Pressure Switch error was
detected (this code can set due to a single or multiple circuit faults). Possible Causes: U/D Solenoid control circuit is open or
shorted to ground U/D Solenoid control circuit is shorted to system power U/D Solenoid is damaged or has failed TCM or PCM
has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0783 1T A/T 3-4 Shift Solenoid - No RPM Drop at Lockup Conditions: Engine started; vehicle driven to over 30: mph, and the
PCM did not detect the correct amount of rpm drop after a gear change occurred. Possible Causes: ATF fluid level is burnt,
contaminated or low 3-4 Solenoid control circuit is open or shorted (intermittent fault) 3-4 Solenoid is damaged or has failed
Transmission oil pan has excessive debris.

 

OBD II Trouble Code

P0830 1T: M/T Clutch Pedal Depressed Circuit Malfunction Conditions: Engine cranking or vehicle driven to over 15 mph at an
engine speed of 1550-2880 rpm with the delta throttle at over 1.1v for 4 seconds, and the PCM detected an unexpected voltage
condition on the Clutch Pedal switch circuit (test must fail 5 times during one trip). Possible Causes: CPP switch signal circuit is
open or shorted to ground CPP switch power circuit is open (test the power at the PDC) Clutch pedal is damaged or has failed
PCM has failed.
P0833 1T: M/T Clutch Pedal Released Circuit Malfunction Conditions: Engine cranking or vehicle driven to over 15 mph at an
engine speed of 1550-2880 rpm with the delta throttle at over 1.1v for 4 seconds, and the PCM detected an unexpected voltage
condition on the Clutch Pedal switch circuit (test must fail 5 times during one trip). Possible Causes: CPP switch signal circuit is
open or shorted to ground CPP switch power circuit is open (test the power at the PDC) Clutch pedal is damaged or has failed
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0841 1T: Low/Reverse Pressure Switch Sense Circuit Malfunction Conditions: Engine started; vehicle driven in a forward gear,
and the PCM detected an unexpected voltage condition on the Low/Reverse Pressure Switch Sense circuit during the CCM test.
Possible Causes: L/R pressure switch sense circuit is open or shorted to ground L/R pressure switch sense circuit is shorted to
power (B+) L/R pressure switch is damaged or it has failed TCM relay power circuit to L/R switch is open (loss of B+) TCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0845 1T: A/T 2/4 Hydraulic Pressure Test Malfunction Conditions: Engine speed over 1000 rpm, then immediately after a shift
event, the PCM detected a failure in one or more of the Pressure Switch circuits (i.e., it tests switches that are not operating).
Possible Causes: 2/4 pressure is incorrect, or internal transmission faults exist 2/4 pressure switch circuit is open, shorted to
ground or power 2/4 pressure switch is damaged or it has failed Transmission solenoids/TRS assembly is damaged or have
failed TCM relay power circuit to 2/4 switch is open (loss of B+) Intermittent wiring or connector problems exist PCM or TCM has
failed.
P0846 1T: A/T 2/4 Pressure Switch Circuit Malfunction Conditions: Engine started; vehicle driven in a forward gear, and the
PCM detected that the 2/4 Pressure Switch circuit indicated open or closed at the wrong time. Related relay DTCs may be
present. Possible Causes: 2/4 pressure is incorrect, or internal transmission faults exist 2/4 pressure switch circuit is open,
shorted to ground or power 2/4 pressure switch is damaged or it has failed TCM relay power circuit to L/R switch is open (loss of
B+) PCM/TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0850 2T: A/T Park/Neutral Switch Performance Conditions: Engine running; gearshift selector in Park, Neutral or Drive position
(not Limp-In mode). The PCM detected an invalid Park/Neutral switch state during vehicle operation. Possible Causes: Check
for any TCM related codes stored in the TCM controller PCM has failed.
P0867 1T: A/T Line Pressure Malfunction Conditions: Engine started; vehicle driven, and the PCM detected the Actual Line
Pressure was not within 10 psi of the Desired Line pressure. Possible Causes: Check for related trouble codes Check TCM
connectors for loose or damaged terminals A/T line pressure is out of range TCM line pressure is out of range.
P0868 1T: A/T Line Pressure Low Conditions: Engine started; vehicle driven, and the PCM detected the Actual Line Pressure
indicated 10 psi less than the Desired Line pressure. Possible Causes: Check for related trouble codes Check TCM connectors
for loose or damaged terminals A/T line pressure is out of range TCM line pressure is out of range.
DTC Trouble Code Title, Conditions & Possible Causes:
P0869 1T: A/T Line Pressure High Conditions: Engine started; vehicle driven, and the PCM detected the Actual Line Pressure
indicated 10 psi more than the Desired Line pressure. Possible Causes: Check for related trouble codes Check TCM connectors
for loose or damaged terminals A/T line pressure is out of range TCM line pressure is out of range.
P0870 1T: A/T Hydraulic Pressure Line Malfunction Conditions: Engine started; vehicle driven at over 1000 rpm, then
immediately after a shift, the PCM detected a malfunction in one or more of the Pressure Switch circuits (it detected the switch
did not close twice). DTC P0944 may be present. Possible Causes: Check for related line pressure trouble codes Check for
related speed ratio and pressure switch codes 5v supply circuit is open or is shorted to ground Transmission Control Relay
output circuit is open OD Pressure Switch sense circuit is shorted to ground or to voltage Excessive debris in the oil pan Line
pressure Sensor connector is loose or damaged Oil pressure switch is damaged or has failed Intermittent wiring or connector
problems exist PCM or TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0871 1T: A/T O/D Pressure Switch Circuit Malfunction Conditions: Engine started; vehicle driven in a forward gear, and the
PCM detected that the O/D Pressure Switch circuit indicated open or closed at the wrong time. Possible Causes: Related DTCs
may be present O/D pressure is incorrect, or internal transmission faults exist O/D pressure switch circuit is open, shorted to
ground or power O/D pressure switch is damaged or it has failed TCM relay power circuit to O/D switch is open (loss of B+)
Intermittent wiring or connector problems exist PCM or TCM has failed.
P0875 1T: A/T U/D Hydraulic Pressure Test Malfunction Conditions: Engine speed over 1000 rpm, then immediately after a shift
event, the TCM/PCM detected a fault in one or more of the Pressure Switch circuits (it detected the switch did not close twice).
Possible Causes: Check for related line pressure trouble codes Check for related speed ratio and pressure switch codes 5v
supply circuit is open or shorted to ground U/D Pressure switch sense circuit is open or shorted to ground or to voltage
Excessive debris in the oil pan Line pressure Sensor connector is loose or damaged U/D Oil Pressure Switch is damaged or it
has failed TCM has failed Intermittent wiring and connector problems.
P0876 1T: A/T U/D Pressure Switch Sense Malfunction Conditions: Engine started; vehicle driven in a forward gear, and the
PCM detected that the U/D Pressure Switch Sense circuit indicated open or closed at the wrong time during the CCM test
period. Possible Causes: U/D pressure is incorrect, or internal transmission faults exist U/D pressure switch circuit is open,
shorted to ground or power U/D pressure switch is damaged or it has failed TCM relay power circuit to L/R switch is open (loss
of B+) TCM has failed.
P0884 1T: A/T U/D Pressure Switch Sense Malfunction Conditions: Engine started; vehicle driven in a forward gear, and the
PCM detected that the U/D Pressure Switch Sense circuit indicated open or closed at the wrong time during the CCM test
period. Possible Causes: U/D pressure is incorrect, or internal transmission faults exist U/D pressure switch circuit is open,
shorted to ground or power U/D pressure switch is damaged or it has failed TCM relay power circuit to L/R switch is open (loss
of B+) TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0884 1T: Power-Up Automatic Transmission Speed Malfunction Conditions: Engine started, TCM relay enabled; and the TCM
detected a valid forward gear PNDRL signal with the Output Speed more than 800 rpm indicating a vehicle speed of over 20
mph. Note: The TCM has separate powers and grounds specifically to its portion of the PCM. Possible Causes: TCM power
supply circuit to direct battery is open TCM power supply circuit to the ignition switch is open TCM power ground circuit is open
or the connector is loose TCM has failed.
P0890 1T: A/T TCM Switched Battery Circuit Malfunction Conditions: Ignition switch position is changed from one position to
another. TCM relay "not" energized, and the TCM detected voltage present at any of the Pressure Switch input circuits. Note:
Due to the integration of the PCM and TCM, the transmission part of the PCM has its own specific power and ground circuits.
Possible Causes: 2/4 switch circuit is shorted to system power (B+) L/R switch circuit is shorted to system power (B+) O/D
switch circuit is shorted to system power (B+) TCM switched battery circuit is damaged Intermittent wiring or connector problems
exist PCM/TCM has failed.
P0891 1T: A/T TCM Relay Always On Conditions: Key on or engine cranking; TCM relay "not" energized, and the TCM detected
voltage present at the TCM output circuit during the test. Note: Due to the integration of the PCM and TCM, the transmission
part of the PCM has its own specific power and ground circuits. Possible Causes: TCM relay output circuit is shorted to system
power (B+) TCM relay control circuit is shorted to system power (B+) TCM relay is damaged or it has failed (it may be stuck
closed) Intermittent wiring or connector problems exist PCM/TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0897 1T: A/T Transmission Fluid Burnt or Worn out Conditions: Engine started; vehicle driven, and immediately after a
transition from full TCC lockup to partial TCC engagement (for A/C bump prevention), the TCM detected vehicle shutter during
engagement. Possible Causes: Automatic transmission fluid is burnt or contaminated Automatic transmission fluid is worn out.
P0932 1T: A/T Line Pressure Malfunction Conditions: Engine started; vehicle driven in any forward gear, and the TCM detected
the Line Pressure Sensor signal was less than 0.20v or more than 4.75v during the CCM test period. Possible Causes: Line
pressure Sensor connector is damaged or loose Line pressure Sensor circuit is open or shorted to ground Line pressure Sensor
circuit is shorted to VREF (5v) Line pressure Sensor ground circuit is open Line pressure Sensor supply circuit (5v) is open or
missing TCM Line Pressure Low or High circuit is open.
DTC Trouble Code Title, Conditions & Possible Causes:
P0944 1T: A/T Loss Of Prime Pressure Conditions: Engine started; vehicle driven, and immediately after a slipping condition is
detected with the pressure switches "not" indicating pressure, the PCM detected a loss of prime pressure. In effect, the TCM
turns "on" available elements to detect if prime pressure exists. The DTC sets if no pressure switches respond. Possible
Causes: A/T pressure switch connector is damaged, loose or shorted Invalid PRNDL code (shift lever position error) Automatic
transmission fluid level is too low Transmission oil filter is clogged or severely restricted Transmission oil pump is damaged or
weak Intermittent wiring or connector problems exist.
P0951 1T: A/T AutoStick Sensor Circuit Malfunction Conditions: Engine started; vehicle driven, transmission not in AutoStick
position, and the TCM that either the Upshift or Downshift switch was closed, or if the Upshift and Downshift switches are closed
at the same time. Possible Causes: AutoStick assembly is damaged or has failed AutoStick connector is damaged, loose or
shorted Downshift switch circuit is shorted too ground Upshift switch circuit is shorted to ground.
DTC Trouble Code Title, Conditions & Possible Causes:
P0987 1T: A/T 4C Hydraulic Pressure Test Malfunction Conditions: Engine started; vehicle driven at over 1000 rpm, then
immediately after a shift and every minute thereafter. After a shift into a forward gear, with engine speed more than 1000 rpm,
the TCM momentarily turns on element pressure to the clutch circuits that don't have pressure to identify the correct pressure
switch that closes. If the pressure switch does not close 2 times, this DTC will set. Related line pressure DTCs are present.
Possible Causes: Check for related speed ratio and pressure switch codes Excessive debris in the oil pan 5v supply circuit is
open or is shorted to ground Transmission Control Relay output circuit is open 4C Pressure Switch sense circuit is shorted to
ground or to voltage Line Pressure Sensor connector is loose or damaged 4C Line Pressure Sensor has failed Transmission
Solenoid/TRS Assembly has failed Internal transmission problems TCM has failed Intermittent wiring and connector problems.
P0988 1T: A/T 4C Pressure Switch Sense Circuit Malfunction Conditions: Engine started; vehicle driven in any forward gear,
and the PCM detected that the 4C Pressure Switch circuit indicated open or closed at the wrong time during the CCM test.
Related Relay DTCs are present. Possible Causes: 4C pressure is incorrect, or internal transmission faults exist 4C Pressure
Switch sense circuit is open, shorted to ground or power 4C Pressure Switch is damaged or it has failed TCM Relay power
circuit to L/R switch is open (loss of B+) PCM/TCM has failed Intermittent wiring and connector problems.
P0992 1T: A/T 2/4 & O/D Hydraulic Pressure Test Malfunction Conditions: Engine started; vehicle driven at over 1000 rpm, then
immediately after a shift, the PCM detected a malfunction in one or more of the Pressure Switch circuits (it tests the switches
that are not operating). If the pressure switch does not close 2 times, the DTC will set. Possible Causes: 2/4 pressure switch
circuit is open, shorted to ground or power 2/4 pressure switch is damaged or it has failed O/D pressure switch circuit is open,
shorted to ground or power O/D pressure switch is damaged or it has failed Internal transmission faults exist TCM relay power
circuit to 2/4 or O/D switch open (loss of B+) PCM/TCM has failed.

 

DTC Trouble Code Title, Conditions & Possible Causes:
P0110 1T: CCM 1999 Decreased Engine Performance Due To High Intake Air Temperature Conditions: Engine started, engine
running, and the PCM detected the Intake Air Temperature exceeded its normal operating range during the test. Possible
Causes: IAT Sensor is contaminated, dirty or skewed Base engine conditions causing the high operating temperature ECM has
failed.
P0115 1T: General Temperature Sensor Performance Conditions: Engine "off" more than 8 hours, then engine started, ambient
temperature above -10°F; and after a calibrated amount of cool-down time, the PCM compares the values from the Ambient Air
Temperature (AAT), Engine Coolant Temperature (ECT) and Intake Air Temperature (IAT) Sensors. If the PCM detects that the
value of any combination of these Sensors (AAT-IAT, AAT-ECT or ECT-IAT) is less than a calibrated value, it will set this trouble
code. Possible Causes: Sensor signal circuit is open or shorted to ground Sensor ground circuit is open or shorted to VREF (5v)
One or more of the identified Sensors is out-of-calibration Ambient air temperature Sensor is damaged or it has failed PCM High
or Low circuit is damaged or it has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0192 1T: Intake Air Temperature Sensor Circuit Low Input Conditions: Engine started; system voltage over 10.5v and the PCM
detected the IAT Sensor signal was less than 0.80v during the CCM test period. Possible Causes: IAT Sensor signal circuit is
shorted to ground IAT Sensor is damaged or has failed PCM has failed.
P0193 1T: Intake Air Temperature Sensor Circuit High Input Conditions: Engine started; system voltage over 10.5v and the
PCM detected the IAT Sensor signal was more than 4.90v during the CCM test. Possible Causes: IAT Sensor connector is
damaged or it is open IAT Sensor signal circuit is open between the Sensor and PCM IAT Sensor ground circuit is open
between the Sensor and PCM IAT Sensor damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0195 1T: O2 (B1 S1) Circuit Insufficient Activity Conditions: Engine started, vehicle driven with the throttle open at a speed
over 18 mph at light engine load for over 5 minutes, ECT Sensor more than 170°F, and the PCM detected the O2 signal
switched from 0.39v to 0.60v too few times during the Oxygen Sensor Monitor test. Possible Causes: Base engine mechanical
fault affecting more than one cylinder Exhaust leak present in exhaust manifold or exhaust pipes O2 element fuel contamination
or has deteriorated O2 signal circuit or ground circuit has high resistance PCM has failed.
P0196 1T: O2 (B2 S1) Circuit Insufficient Activity Conditions: Engine started, vehicle driven with the throttle open at a speed
over 18-55 mph at light engine load for over 5 minutes, ECT Sensor more than 170°F, and the PCM detected the O2 signal
switched from 0.39v to 0.60v too few times in the Oxygen Sensor Monitor test. Possible Causes: Base engine mechanical fault
affecting more than one cylinder Exhaust leak present in exhaust manifold or exhaust pipes O2 element fuel contamination or
has deteriorated O2 signal circuit or ground circuit has high resistance.
P0197 1T: O2 (B1 S2) Circuit Insufficient Activity Conditions: Engine started, vehicle driven with the throttle open at a speed
over 18-55 mph at light engine load for over 5 minutes, ECT Sensor more than 170°F, and the PCM detected the O2 signal
switched from 0.39v to 0.60v too few times in the Oxygen Sensor Monitor test. Possible Causes: Base engine mechanical fault
affecting more than one cylinder Exhaust leak present in exhaust manifold or exhaust pipes O2 element fuel contamination or
has deteriorated O2 signal circuit or ground circuit has high resistance.
DTC Trouble Code Title, Conditions & Possible Causes:
P0281 2T: ECT Engine Is Cold Too Long Conditions: Engine started, engine runtime more than 20 minutes, and the PCM
detected the engine temperature did not exceed 176°F in the period. Possible Causes: Check the operation of the thermostat (it
may be stuck open) ECT Sensor signal circuit has high resistance ECT Sensor is damaged or it has failed Inspect for low
coolant level or an incorrect coolant mixture.
P0282 1T: Fuel Pump Relay Control Circuit Malfunction Conditions: Key on or engine started, system voltage over 10.5v, and
the PCM detected an unexpected voltage condition on the Fuel Pump Relay control circuit during the CCM test period. Possible
Causes: Fuel pump relay control circuit is open or shorted to ground Fuel pump relay power circuit is open (test power from
Ignition) Fuel pump relay is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0283 1T: Idle Select Signal Invalid Conditions: Key on and the Fuel Pump Control Module (VP44) detected an invalid Low Idle
Select signal from the PCM (ECM controller). Possible Causes: Low idle select signal circuit is open or shorted to ground Low
idle select signal circuit is shorted to VREF or to power ECM internal circuit is shorted to ground ECM internal regulator output is
more than 6.0v Fuel injection pump is damaged or has failed.
P0284 1T: Fuel Injection Pump Battery Voltage Out-Of-Range Conditions: Key on and the Fuel Pump Control Module (VP44)
detected an invalid Low Idle Select signal from the PCM (ECM controller). Possible Causes: Fuel injection pump is damaged or
has failed.
P0285 1T: Fuel Injection Pump Controller Always on Conditions: Engine started, engine running, and the PCM detected the Fuel
Injection Pump Controller was in an "always on" condition. Possible Causes: Fuel injection pump relay driver circuit shorted to
system power Fuel injection pump relay output circuit shorted to power Fuel injection pump relay is damaged or has failed ECM
has failed.
P0286 1T: Accelerator Position Sensor Supply Voltage High Input Conditions: Key on or engine running; and the PCM detected
the supply voltage circuit to the Accelerator Position (APP) Sensor was too high. Possible Causes: APP Sensor supply voltage
circuit is shorted to system power APP Sensor signal circuit is shorted to power APP Sensor ground circuit is open ECM has
failed.
P0287 1T: Fuel Injection Pump Battery Voltage Out-Of-Range Conditions: Engine started and the PCM detected the Fuel
Injection Pump battery voltage was too low. Possible Causes: Fuel injection pump ground circuit is open Generator voltage is
less than 12.0v (the Generator has failed) Battery voltage is less than 8.0v (the battery is defective) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0289 1T: Manifold Tuning Valve Control Circuit Malfunction Conditions: Key on or engine cranking; and the PCM detected an
unexpected voltage condition on the Manifold Tuning Valve (MTV) control circuit. Possible Causes: MTV control circuit is open
between the solenoid and PCM MTV control circuit is shorted to Sensor or chassis ground MTV is damaged or has failed PCM
has failed.
P0290 1T: Certified Natural Gas Fuel System Pressure Too High Conditions: Engine started, and the PCM detected the CNG
Fuel System was operating outside of its normal operating range during the CCM test. Possible Causes: CNG pressure Sensor
signal is skewed CNG fuel system component is damaged or has failed PCM has failed.
P0291 1T: No Temperature Rise Detected from the Intake Heaters Conditions: No IAT or IAH Relay codes set. Preheat function
completed before startup. Post-heat function active. Engine cranking for less than 5 seconds. Engine runtime over 15 seconds.
IAT Sensor from 0-66°F. BTS and IAT Sensors within 10°F of each other. Time between engine preheat period and engine run
state is less than 30 seconds. PCM did not detect a temperature increase at the Intake Heaters. Possible Causes: Battery cable
from No. 1 Relay to No. 1 Heater is open Battery cable from No. 2 Relay to No. 1 Heater is open Battery cable to the No. 1
Relay is open or has high resistance Battery cable to the No. 2 Relay is open or has high resistance Intake Air Heater Relay is
damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0292 1T: Certified Natural Gas Pressure Sensor Circuit Low Input Conditions: Engine started and the PCM detected the CNG
Pressure Sensor indicated less than 0.49v. Possible Causes: CNG pressure Sensor signal circuit is shorted to ground CNG
pressure Sensor is damaged or has failed PCM has failed.
P0294 1T: Target Idle Speed Not Reached Conditions: DTC P0106, P0107, P0108, P0121, P0122 and P0123 not set, engine
started, running at idle in Drive or Neutral, and the PCM detected the Actual idle speed was more than 200 rpm over or more
than 100 rpm less than the Target speed for over 14 seconds. Possible Causes: Engine vacuum leak in a hose, brake booster
or in the engine IAC motor control circuits open or grounded in the wire harness Throttle body dirty or restricted (trying cleaning
it and retesting) Throttle linkage or throttle plate not in the correct position PCM has failed.
P0294 1T: Target Idle Speed Not Reached Conditions: DTC P0106, P0107, P0108, P0121, P0122 and P0123 not set, engine
started, engine running at idle in Drive or Neutral, and the PCM detected the Actual idle speed was more than 200 rpm over or
more than 100 rpm less than the Target speed for over 14 Van seconds. Possible Causes: Engine vacuum leak in a hose, Brake
Booster or in the engine IAC motor control circuits open or grounded in the wire harness Throttle body dirty or restricted (trying
cleaning it and retesting) Throttle linkage or throttle plate not in the correct position PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0295 1T: 5-Volt VREF Missing to APP Sensor Conditions: Key on or engine running; and the PCM detected the supply voltage
circuit to the Accelerator Position (APP) Sensor was too low. Possible Causes: APP Sensor supply voltage circuit is open
ACCEL pedal position Sensor is damaged or has failed APP Sensor supply circuit shorted to chassis or Sensor ground PCM
has failed.
P0296 1T: 5-Volt VREF Supply Not Present Conditions: Key on, altitude indicating zero feet above sea level, then the PCM
detected the MAP Sensor was near 101 kPa; or with altitude at 1200 feet above sea level, the MAP Sensor was near 88 kPa.
Possible Causes: MAP Sensor VREF circuit open between the Sensor and PCM MAP Sensor ground circuit open between the
Sensor and PCM MAP Sensor is damaged or has failed PCM has failed.
P0297 1T: No Change In MAP Signal From Start To Run Transition Conditions: Engine started, and with the engine speed
within 64 rpm of the Target idle speed, the PCM detected too small a difference between the BARO and MAP Sensor signals for
8.80 seconds. Possible Causes: Engine vacuum port to MAP Sensor clogged, dirty or restricted MAP Sensor signal is skewed
or the Sensor is out of- calibration MAP Sensor VREF circuit open or grounded (intermittent fault) PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0297 1T: No Change In MAP Signal From Start To Run Transition Conditions: Engine started, and with the engine speed
within 64 rpm of the Target idle speed, the PCM detected too small a difference between the BARO and MAP Sensor signals for
8.80 seconds. Possible Causes: Engine vacuum port to MAP Sensor clogged, dirty or restricted MAP Sensor signal is skewed
or the Sensor is out-of calibration MAP Sensor VREF circuit open or grounded (intermittent fault) PCM has failed.
P0299 2T: IAC Vacuum Leak Present With IAC Valve Fully Seated Conditions: Engine running at idle speed in closed loop, and
the PCM detected the MAP Sensor signal did not correlate to the TP Sensor signal under these operating conditions during the
test. Possible Causes: Leaking engine vacuum hose, brake booster, or in the engine MAP Sensor is out-of-calibration or skewed
TP Sensor is damaged or has failed (perform a sweep test) PCM has failed.
P0388 1T: Auto Shutdown Relay Control Circuit Malfunction Conditions: Key on or engine cranking; and the PCM detected an
unexpected voltage condition on the ASD Relay Control circuit. The ASD Relay coil resistance is 95-105 ohms at 68°F. Possible
Causes: ASD relay control circuit is open between the relay and PCM ASD relay control circuit is shorted to ground ASD relay
power circuit is open (test power from Fused B+) ASD relay is damaged or has failed PCM has failed.
P0388 1T: Auto Shutdown Relay Control Circuit Malfunction Conditions: Key on or engine cranking; and the PCM detected an
unexpected voltage condition on the ASD Relay Control circuit. The ASD Relay coil resistance is 95-105 ohms at 68°F. Possible
Causes: ASD relay control circuit is open between the relay and PCM ASD relay control circuit is shorted to ground ASD relay
power circuit is open (test power from Fused B+) ASD relay is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P03891T: No Auto Shutdown Relay Output Voltage to PCM Conditions: Engine cranking; and the PCM did not detect any
voltage on the ASD Relay Output circuit to the PCM during the CCM test. Possible Causes: ASD relay connector is damaged,
loose or shorted ASD relay output circuit is open between the relay and PCM ASD relay power circuit is open (test power from
Fused B+) ASD relay is damaged or has failed PCM has failed.
P03901T: Timing Belt Skipped One Tooth or More Conditions: Engine started, engine running, then with the Inhibit Test not
active, the PCM checked the CKP and CMP Sensor alignment. If the PCM detects the CMP Sensor is offset from the CKP
Sensor signal by 1 tooth, this trouble code is set. The PCM performs the Inhibit Test whenever the engine is cold, if the engine
speed is outside of a given window, or if there is a large change in the MAP Sensor signal. Possible Causes: Camshaft timing is
out of specifications Valve timing is out of specifications.
P03911T: CKP Or CMP Sensor Signal Intermittent Conditions: Engine started, engine running, and after every 69- degree CKP
Sensor leading edge and trailing signal edge is determined, the PCM updates this data and compares it to the true CMP Sensor
port level. If the PCM detects a disagreement between these two values 20 times in succession, this trouble code is set.
Possible Causes: Camshaft Sensor is not installed properly Engine valve timing is not within specifications Perform a CKP and
CMP Sensor relearn with the scan tool Tone wheel or pulse ring is damaged.
P03981T: Misfire Adaptive Numerator At Limit Conditions: Engine started; ECT Sensor under 75°F; engine runtime over 50 sec.;
A/C "OFF"; vehicle speed over 36 mph in 1st gear, or over 65 mph in high gear, followed by a closed throttle decel period. This
code sets if the PCM detects one of the CKP Sensor target windows varies more than 2.86% from the reference window.
Background - PCM needs to learn any variation in engine machining to detect when a misfire is present. CKP Sensor has 2 40
windows that are 180 apart. The window for Cylinders 1 and 4 is the reference window. It is checked against the window for
Cylinders 2 and 3. The PCM checks for any variation to make engine speed adjustments. Possible Causes: Base engine
problem (i.e., low cylinder compression) CKP Sensor crankshaft target variation too large CKP Sensor improperly installed or
the CKP Sensor has failed CKP Sensor signal circuit open or shorted (intermittent fault) Tone wheel or pulse ring is damaged.
DTC Trouble Code Title, Conditions & Possible Causes:
P0475 1T: Auxiliary 5-Volt Supply Circuit High Input Conditions: Key on or engine running; and the PCM detected an
unexpected "high" voltage condition on the Auxiliary 5-volt power circuit. Possible Causes: Auxiliary 5v supply circuit shorted to
system power MAP Sensor VREF circuit is shorted to ground MAP Sensor is open internally PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0480 1T: Positive Crankcase Ventilation Solenoid Circuit Failure Conditions: Engine started and the PCM detected an
unexpected voltage on the PCV Solenoid circuit. Possible Causes: PCV solenoid control circuit is open or shorted to ground
PCV solenoid power circuit is open to the fuse in the PDC PCV solenoid is damaged or has failed PCM has failed.
P0481 1T: EVAP Leak Detection Monitor Pinched Hose Detected Conditions: BTS from 40-96°F, ECT Sensor within 10°F of the
BTS signal at startup (cold engine); engine started, and after the EVAP Leak test started, the PCM detected a no flow condition.
Possible Causes: EVAP vapor hose blocked between the fuel tank and the LDP (check rollover valve) EVAP ventilation solenoid
is damaged or has failed Purge line is loose, damaged or incorrectly routed.
P0486 2T: EVAP Leak Detection Monitor Pinched Hose Detected Conditions: BTS from 40-96°F and ECT Sensor within 20°F of
the BTS signal at startup (cold engine), engine started, and after the EVAP Leak Detection test was enabled, the PCM detected
the LDP switch did not reach 3 closures (i.e., a "no flow" condition was present). Possible Causes: EVAP vapor hose blocked
between the fuel tank and the LDP (i.e., in the OLFV, rollover or vapor hose) EVAP canister is clogged or full of dirt or moisture
EVAP ventilation solenoid is damaged or has failed Purge line is loose, damaged or incorrectly routed PCM has failed.
P0488 1T: Auxiliary 5-Volt Supply Circuit Low Input Conditions: Key on or engine running; and the PCM detected an unexpected
"low" voltage condition on the Auxiliary 5-volt power circuit. Possible Causes: Auxiliary 5v supply circuit shorted to Sensor or
chassis ground Camshaft position Sensor VREF circuit is shorted to ground MAP Sensor VREF circuit is shorted to ground Oil
Pressure Sensor VREF circuit is shorted to ground PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0489 1T: High Speed Radiator Fan Relay Circuit Malfunction Conditions: Key on or engine running; system voltage over 10.5v,
and the PCM detected an unexpected voltage condition on the High Speed Radiator Fan Relay control circuit during the CCM
test. Possible Causes: HFAN radiator relay control circuit is open or shorted to ground HFAN radiator relay power circuit is open
(test power to IGN) HFAN radiator fan relay is damaged or has failed PCM has failed.
P0490 1T: Low Speed Radiator Fan Relay Circuit Malfunction Conditions: Key on or engine running; system voltage over 10.5v,
and the PCM detected an unexpected voltage condition on the Low Speed Radiator Fan Relay control circuit during the CCM
test. Possible Causes: LFAN radiator relay control circuit is Van open or shorted to ground LFAN radiator relay power circuit is
open (test power to IGN) LFAN radiator fan relay is damaged or has failed PCM has failed.
P0491 1T: Radiator Fan Control Relay Circuit Malfunction Conditions: Key on or engine running; system voltage over 10.5v, and
the PCM detected an unexpected voltage condition on the Radiator Fan Control Relay circuit during the CCM test period.
Possible Causes: Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test
power to IGN) Radiator fan control relay is damaged or has failed PCM has failed.
P0492 1T: Battery Temperature Sensor Circuit High Input Conditions: Key on or engine running; and the PCM detected the BTS
signal indicated more than 4.90v for 3 seconds during the CCM test. Possible Causes: BTS signal circuit is open between the
Sensor and the PCM BTS ground circuit is open between the Sensor and the PCM BTS (Sensor) is damaged or the PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0493 1T: Battery Temperature Sensor Circuit Low Input Conditions: Key on or engine running; and the PCM detected the BTS
signal indicated less than 0.30v for 3 seconds during the CCM test. Possible Causes: BTS circuit is shorted to ground between
Sensor and the PCM BTS (Sensor) is damaged or has failed PCM has failed.
P0494 1T: EVAP Leak Detection Pump Switch Or Mechanical Fault Conditions: BTS from 40-96°F and ECT Sensor within 10°F
of the BTS signal at startup (cold engine), engine started, and the PCM detected the LDP switch was not in its expected state at
key "on" or engine running. Possible Causes: LDP switch signal circuit is open or shorted to ground LDP switch power circuit is
open (test power to Fused Ignition) LDP vacuum hose is clogged, loose or restricted LDP assembly is damaged or has failed
(the switch has failed).
P0495 1T: Leak Detection Pump Solenoid Circuit Malfunction Conditions: Engine started, ECT Sensor from 40-90° F and within
10°F of the Battery Temperature Sensor signal, engine running, and the PCM detected the Actual state of the Leak Detection
Pump solenoid did not match the Intended state of the solenoid during the test period. Possible Causes: LDP power supply
circuit from the ignition switch is open LDP solenoid control circuit is open or shorted to ground LDP assembly is damaged or it
has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0496 1T: 5-Volt VREF Supply Voltage Too Low Conditions: Key on or engine running; and the PCM detected the 5-volt VREF
supply was less than 3.5v for 4 seconds during the CCM test. Possible Causes: A/C pressure Sensor has failed (a short to
ground condition) MAP Sensor has failed (a short to ground condition) TP Sensor has failed (a short to ground condition) PCM
has failed.
P0498 1T: No CCD Messages Received from the TCM Conditions: Key on or engine running; and the PCM detected a failure to
communicate with the TCM over the CCD data Bus circuit. Possible Causes: CCD data Bus circuit is open, shorted to ground or
to power TCM or the PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0595 1T: Speed Control Solenoid Circuit Failure Conditions: Engine started, vehicle driven at over 35 mph, S/C enabled with
the Set switch "on", and the PCM detected it could not control the operation of the vacuum and vent control solenoids. Possible
Causes: S/C power supply circuit is open (test power from Brake switch) S/C vacuum solenoid control circuit open or shorted to
ground S/C vent solenoid control circuit is open or shorted to ground S/C vacuum or vent solenoid is damaged or has failed
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0596 1T: Speed Control Switch Continuous High Input Conditions: Key on or engine running; and the PCM detected the S/C
switch was in a continuous high voltage state (over 4.70v) during the CCM test. Possible Causes: S/C On/Off switch is open S/C
switch (MUX switch) is open S/C switch (MUX switch) is shorted to VREF or system power S/C switch (MUX switch) is damaged
or has failed PCM has failed.
P0597 1T Speed Control Switch Continuous Low Input Conditions: Key on or engine running; and the PCM OBD II Trouble
Code List (P1XXX Codes) Continued: detected the S/C switch was in a continuous low voltage state (below 4.50v) during the
CCM test. Possible Causes: S/C On/Off switch is shorted to ground S/C switch (MUX switch) is shorted to ground S/C switch
(MUX switch) is damaged or has failed PCM has failed.
P0598 1T: A/C Pressure Sensor Circuit High Input Conditions: Engine started, engine running, A/C Relay is "on", and the PCM
detected the A/C Pressure Sensor indicated more than 4.90v. Possible Causes: A/C pressure Sensor circuit is open or shorted
to VREF (5v) A/C pressure Sensor ground circuit is open A/C pressure Sensor is damaged or has failed PCM has failed.
P0599 1T: A/C Pressure Sensor Circuit Low Input Conditions: Engine started, engine running, A/C Relay is "on", and the PCM
detected the A/C Pressure Sensor indicated less than 0.70v. Possible Causes: A/C pressure Sensor circuit is shorted to ground
A/C pressure Sensor power circuit is open A/C pressure Sensor is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0602 1T: PCM Not Programmed Conditions: Key on. The PCM detected that it had not been programmed. Possible Causes:
Program the PCM and then retest for this same trouble code PCM has failed.
P0603 1T: PCM Powertrain Control Module Internal Dual-Port Ram Communication Conditions: Key on; and the PCM detected
an error message that indicated that it had not been programmed or that it was programmed properly. Possible Causes: Fused
ignition switch output is missing (off-start-run circuit) PCM is damaged or it has an internal failure.

 

P0604 1T: PCM Internal Dual-Port Ram Read/Write Integrity Failure Conditions: Key on; and the PCM detected an error
message that indicated it had not been programmed, or it was not programmed properly. Possible Causes: Fused ignition switch
output is missing (off-start-run circuit) PCM is damaged or it has an internal failure.
DTC Trouble Code Title, Conditions & Possible Causes:
P0607 1T: PCM Powertrain Control Module Internal Shutdown Timer Rationality Conditions: Cold engine startup, and after the
PCM compared the coolant temperature to the shutdown time, it detected a rationality fault. Possible Causes: Fused ignition
switch output is missing (off-start-run circuit) PCM is damaged or it has an internal failure.
DTC Trouble Code Title, Conditions & Possible Causes:
P0652 1T: Serial Communication Link Malfunction Conditions: Engine started; and after the TCM did not detect any signals on
the Serial Communication Line for more than 20 seconds. Note: Due to the integration of the PCM and TCM, Bus
communication between the modules is internal. Possible Causes: TCM cannot communicate with the Instrument Cluster (MIC)
TCM cannot communicate with the Powertrain Control Module PCM/TCM is damaged or it has an internal failure.
DTC Trouble Code Title, Conditions & Possible Causes:
P0681 1T: PCM No Fuel Level Bus Messages Conditions: Key on, and the PCM determined that it did not receive any Fuel
Level messages over the Data Bus line for 20 seconds. Possible Causes: Data Bus circuit from BCM to PCM is damaged or it
has failed Fuel level Bus message to the PCM is invalid BCM is damaged or has failed PCM unable to communicate with the
Body Control Module.
P0682 1T: Charging System Voltage Too Low Conditions: Engine started; engine speed over 1152 rpm, and the PCM detected
the Battery Sense circuit was 1.0v less than the Charging System circuit for 25 seconds during the CCM test (Generator Lamp is
"on"). Possible Causes: Battery positive or Fused Ignition circuit has high resistance Generator drive belt out-of-adjustment or
worn out Generator field circuit has a high resistance condition PCM has failed.
P0683 1T: Speed Control Relay Or Driver Circuit Malfunction Conditions: Engine started, engine running with the S/C switch
"on"; and the PCM detected an unusual voltage condition on the S/C Relay control circuit during the CCM test. Possible Causes:
S/C power supply circuit is open or shorted to ground S/C dump solenoid (servo) is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0684 1T: PCM Battery Has Been Disconnected Conditions: Key on, and the TCM detected that it had been disconnected from
the Battery Direct (B+) circuit or its Power Ground circuit. This DTC will also set during the scan tool Quick Battery Disconnect
procedure. Note: Due to the integration of the PCM and TCM, the transmission part of the PCM has its own specific power and
ground circuits. Possible Causes: Quick Learn procedure was performed with scan tool TCM battery direct (B+) circuit is open or
disconnected TCM power ground circuit is open PCM/TCM was disconnected or it has been replaced.
P0685 1T: PCM Smart Key Immobilizer Module Invalid Key Conditions: Key on, and the PCM received a message from the
Smart Key Immobilizer Module (SKIM) that an invalid key had been inserted. Possible Causes: A theft attempt may have
occurred. Obtain the correct key and attempt to start the vehicle Do a PCM Reset function to clear the code after engine startup.
P0686 1T: PCM No SKIM Bus Messages Received Conditions: Engine started; and the PCM did not detect any MIC (I/P
Cluster) messages over the Data Bus circuit for 20 seconds. Possible Causes: Data Bus circuit from MIC to the PCM is
damaged or it is open Instrument Cluster is damaged or has failed PCM unable to communicate with the Instrument Cluster
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0687 1T: PCM No Cluster Bus Messages Conditions: Key on or engine running; and the PCM determined that it did not
receive any Security Key Bus Messages over the Data Bus line for 20 seconds. This malfunction may be an intermittent
problem. Possible Causes: Data Bus circuit from SKIM to PCM is damaged or it is open PCM unable to communicate with the
Body Control Module PCM has failed, or the SKIM is damaged or has failed.
P0688 1T: Fuel Injection Pump Internal Malfunction Conditions: Key on or engine running; and the PCM detected an
unexpected "low" voltage condition on the Auxiliary 5-volt power circuit. Possible Causes: Fuel injection pump DTC counter
malfunction Fuel injection pump Good Trip counter malfunction Fuel injection pump is damaged or has failed ECM has failed.
P0689 1T: PCM No Communication Between ECM & Injection Pump Module Conditions: Key on, and the PCM detected the
time between the CAN messages received from the Instrument Panel (I/P) module was more than 3 seconds, or it detected no
messages arrived. Possible Causes: Fuel injection pump ground circuit open or has high resistance Fuel injection module wiring
harness is damaged or has failed CAN data Bus (+) circuit is open, shorted to ground or to power ECM has failed.
P0690 1T: Injection Pump CKP Signal Different Than The CKP Signal Conditions: No CKP or CMP Sensor codes set, engine
started, and the PCM detected that the CKP signal received by the Instrument Panel (I/P) module was not within its normal
operating range. Possible Causes: DTC counter did not change to (0) Fuel injection module wiring harness is damaged or has
failed Fuel injection static timing is incorrect Fuel "sync" circuit is open or shorted to ground ECM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0691 1T: PCM Fuel Injection Pump Calibration Error Conditions: Key on or engine running; and the PCM detected a calibration
error related to the Fuel Injection pump operation during the CCM test. Possible Causes: Fuel Injection pump error at key "on" or
at startup Fuel injection pump is damaged or has failed ECM has failed.
P0692 1T: PCM Diagnostic Trouble Code Set in the Companion Module Conditions: Key on and the PCM detected a diagnostic
trouble code was set in the Companion Module. Possible Causes: Companion Module detected a problem and set a trouble
code in memory ECM has failed.
P0693 1T: PCM Diagnostic Trouble Code Set in the ECM Conditions: Key on or engine running; and the PCM detected a
diagnostic trouble code was set in the Electronic Control Module (ECM). Possible Causes: PCM has detected a problem and set
a trouble code in memory PCM has failed.
P0694 1999- No PCM Bus Messages Conditions: Ignition on or engine started; system voltage over 10.5v and the PCM
determined that it did not receive any Bus messages for 10 seconds. Note: Due to the integration of the PCM and TCM, Bus
communication between the modules is internal. Possible Causes: Data Bus circuit connector is damaged, open or it is shorted
Data Bus circuit to the PCM is damaged or it is open PCM unable to communicate with the body control module Intermittent
wiring or connector problems exist PCM has failed.
P0694: No PCM Bus Messages Conditions: Engine started; system voltage over 10.5v and the PCM determined that it did not
receive any Bus messages for 10 seconds. Possible Causes: Data Bus circuit connector is damaged, open or it is shorted Data
Bus circuit to the PCM is damaged or it is open PCM unable to communicate with BCM or has failed.
P0695 1T: PCM No BCM Bus Messages Conditions: Engine started; system voltage over 10.5v and the TCM determined that it
did not receive any BCM messages for 20 seconds. Possible Causes: Data Bus circuit from BCM to the PCM is damaged or it is
open BCM is damaged or has failed TCM unable to communicate with the TCM, TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0696 1T: PCM EEPROM Write Operation Denied/Invalid Conditions: Engine started or ignition on continuously. PCM detected
an unsuccessful attempt to program/write to the internal EEPROM. Occurred at initialization or shutdown. Possible Causes:
DRB or scan tool displays a "write" failure occurred DRB or scan tool displays "write" refused a second time DRB or scan tool
displays SRI mileage invalid (compare the SRI mileage reading to the reading on the odometer) PCM has failed.
P0696 1T: PCM Failure (EEPROM Write Operation Denied) Conditions: Key on, and the PCM detected an unsuccessful attempt
to "write" to an EEPROM location occurred during initialization. Possible Causes: Clear the trouble codes and retest for the
same trouble code. If DTC P1696 resets, replace the PCM and then reprogram it.
P0697 1T: PCM Failure (EMR/SRI Mileage Not Stored) Conditions: Key on, and the PCM detected an unsuccessful attempt to
"write" the Service Reminder Indicator (SRI) or Emission Mileage Request (EMR) mileage to an EEPROM located occurred
during initialization. Possible Causes: Clear the trouble codes and retest for the same trouble code. If DTC P1697 resets,
replace the PCM and then reprogram it.
P0697 1T: PCM/EMR Or SRI Mileage Not Stored Conditions: Engine started; and the PCM detected an unsuccessful attempt to
"write" the Service Reminder Indicator (SRI) or Emission Mileage Request (EMR) mileage to an EEPROM located occurred
during initialization or at engine shutdown. Possible Causes: DRB or scan tool displays a "write" failure occurred DRB or scan
tool displays "write" refused a second time DRB or scan tool displays SRI mileage invalid (compare the SRI mileage reading to
the reading on the odometer) Clear the trouble codes and retest for the same trouble code. If DTC P1696 resets, replace the
PCM and then reprogram it.
DTC Trouble Code Title, Conditions & Possible Causes:
P0698 1T: PCM No CCD Messages Received from the TCM Conditions: Key on or engine running; and the PCM detected a
failure to communicate with the TCM over the CCD data Bus circuit. Possible Causes: CCD data Bus circuit is open, shorted to
ground or to power TCM or the PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0716 1T: Bus Communication Failure with the PCM Conditions: Key on, and the PCM detected it could not communicate with
the TCM for over 10 seconds. Possible Causes: CCD data Bus circuit is open, shorted to ground or to power extremely low
battery (system) voltage TCM or the PCM has failed.
P0717 1T: Bus Communication Failure with the MIC Conditions: Key on or engine started, and the PCM detected it could not
communicate with the Mechanical Instrument Cluster (MIC) for over 25 seconds during the test. Possible Causes: CCD data
Bus circuit is open, shorted to ground or to power extremely low battery (system) voltage MIC or the TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0738 1T: A/T High Temperature Operation Activated Conditions: Engine started and the PCM detected the TFT Sensor was
more than 240°F during the test. Possible Causes: Engine Cooling Fan System is not operating properly Engine cooling fan has
failed ATF oil level is too high (overfilled) Transmission oil cooler capacity too low, or cooler is plugged TCM or the PCM has
failed.
P0739 1T: A/T Power up Circuit at Speed Conditions: Key on or engine running; and the PCM detected an unexpected "low"
voltage on the TCM power up circuit (battery direct circuit). Possible Causes: Fused Ignition power circuit is open between TCM
and PCM TCM Power UP circuit is open (test power from PDC or Fuse) TCM Power UP circuit is grounded (test power from
PDC or TCM or the PCM has failed.
P0740 2T: PCM/TCM Internal Malfunction Conditions: Engine started; vehicle driven at over 30 mph in 3rd gear with TCC and
Overdrive Clutch engaged, and PCM detected an invalid engine speed to output shaft ratio with the TCC or O/D Clutch
engaged. Possible Causes: ATF fluid is burnt, contaminated or contains excessive debris A/T cooler flow restriction or problems
in the oil pump shaft Internal transmission problem (O/D clutch seals or valve body) Overdrive clutch or TCC clutch is damaged
or has failed Transmission valve body is leaking, damaged or has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0756 1T: A/T Governor Pressure Not Equal To Target At 15-20 PSI Conditions: Engine started; vehicle driven to a speed over
30 mph, and the PCM detected the Governor Pressure Sensor indicated less than 15 psi or more than 30 psi when the
requested pressure was 20-25 psi for 2.2 seconds. This fault must occur 5 times on one trip to set this code. Possible Causes:
Check for the presence of other A/T related trouble codes Governor pressure Sensor is damaged or has failed Governor
pressure Sensor VREF (5v) circuit is open or shorted Transmission valve body is leaking, damaged or has failed PCM has
failed.
P0757 1T: A/T Governor Pressure Above 3 PSI In Gear At 0 MPH Conditions: Engine started; vehicle driven to a speed over 30
mph, and the PCM detected the Governor Pressure Sensor was more than 3 psi with the requested pressure at 0 psi (95% duty
cycle command) for 2.65 seconds. The fault must occur twice on one trip to set the code. Possible Causes: Check for the
presence of other A/T related trouble codes Governor pressure Sensor is damaged or has failed Governor pressure Sensor
VREF (5v) circuit is open or shorted Transmission valve body is leaking, damaged or has failed PCM has failed.
P0762 1T: A/T Governor Pressure Sensor Offset Volts Too High/Low Conditions: Key on or engine running. Gear selector in
Park or Neutral. PCM detected an out-of-range Governor Pressure Sensor signal for 1.3 seconds. The fault must occur 3 times
on one trip to set a code. Possible Causes: Governor pressure Sensor VREF (5v) circuit is open Governor pressure Sensor
ground circuit is open P/N switch is damaged or has failed (not operating properly) Transmission fluid has excessive debris or it
is contaminated PCM has failed.
P0763 1T: A/T Governor Pressure Sensor Signal Too High Conditions: Key on or engine running; and the PCM detected the
Governor Pressure Sensor signal indicated more than 4.89v for 8.5 seconds. Possible Causes: Governor pressure Sensor
signal circuit is open Governor pressure Sensor ground circuit is open Governor pressure Sensor signal circuit is shorted to
VREF Governor pressure Sensor is damaged or has failed Transmission harness solenoid circuit has a problem PCM has
failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0764 1T: A/T Governor Pressure Sensor Signal Too Low Conditions: Key on or engine running; and the PCM detected the
Governor Pressure Sensor signal indicated less than 0.10v for 8.5 seconds. Possible Causes: Governor pressure Sensor signal
circuit is shorted to ground Governor pressure Sensor VREF (5v) circuit is open Governor pressure Sensor is damaged or has
failed Transmission harness solenoid circuit has a problem PCM has failed.
P0765 1T: A/T Transmission Relay Circuit Malfunction Conditions: Key on or engine started, and the PCM detected an
unexpected voltage condition on the TCC solenoid control circuit during the test. Possible Causes: Generator power source
circuit to relay control circuit is open Transmission relay power circuit is open (check fuse in PCC) Transmission control circuit is
open or shorted to ground Transmission relay is damaged or has failed PCM has failed.
P0767 1T: A/T Transmission Relay Circuit Malfunction Conditions: Key on or engine started, and the PCM detected an
unexpected voltage condition on the TCC solenoid control circuit during the test. Possible Causes: Generator power source
circuit to relay control circuit is open Transmission relay power circuit is open (check fuse in PCC) Transmission control circuit is
open or shorted to ground Transmission relay is damaged or has failed PCM has failed.
P0768 1T: A/T Transmission Relay Output Always off Conditions: Engine started; and the TCM did not detect voltage on the
Transmission Control Relay output circuit with the relay "on". Possible Causes: 2/4 or L/R Solenoid control circuit is open O/D or
U/D Solenoid control circuit is open Transmission control relay power circuit is open to Fused B+ Transmission control relay is
damaged (contacts have failed) TCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0775 1T: A/T Solenoid Switch Latched in TCC Position Conditions: Engine started; vehicle driven to over 15 mph and the TCM
detected the Transmission did not shift into 1st Gear (test must fail 3 times). Possible Causes: Related DTC P0841 may be
present. Intermittent wiring or connector problems Extremely low battery (system) voltage L/R Solenoid pressure switch circuit is
open or switch has failed Transmission solenoid pack is damaged or has failed Transmission control relay circuit is shorted to
L/R solenoid Valve body engine idle too high Valve body solenoid switch stuck in "lockup" position PCM has failed.
P0776 2T: A/T Solenoid Switch Latched in Low/Reverse Position Conditions: Engine started; vehicle driven to over 30 mph and
the TCM detected the L/R switch was closed while performing partial or full PEMCC or FEMCC. Possible Causes: Related DTC
P0841 may be present. Intermittent wiring or connector problems L/R pressure switch sense circuit is open, shorted to ground or
to voltage extremely low battery (system) voltage Transmission pan has debris caused by valve body damage Transmission
internal problems, SSV sticking, or valve body damage PCM has failed.
P0781 1T: A/T Overdrive Pressure Switch Circuit Malfunction Conditions: Engine started; engine runtime over 2 seconds,
engine speed over 500 rpm, no "loss of prime" test in progress, no pressure switch mismatch detected, and the TCM detected
the Overdrive pressure switch was open or closed at the wrong time in any gear position. Possible Causes: O/D pressure switch
circuit is open or shorted to ground O/D pressure switch circuit is shorted to the TCR solenoid pack O/D pressure switch is
damaged or has failed O/D solenoid is damaged or has failed Transmission seals are damaged or have failed.
P0782 1T: A/T Overdrive Pressure Switch Circuit Malfunction Conditions: Engine started; and the TCM detected an unexpected
voltage condition on the Overdrive Pressure Switch while driving in any gear positions during the CCM test. Possible Causes:
2/4 line pressure is too high 2/4 pressure switch is open or shorted to ground Solenoid pack is damaged or has failed
Transmission has internal problems or has failed Valve body torque is out of specification.
DTC Trouble Code Title, Conditions & Possible Causes:
P0784 1T: A/T Additional L/R Pressure Switch Circuit Malfunction Conditions: Engine started; vehicle driven to a speed over 30
mph in Drive, and the PCM detected an invalid Low/Reverse Pressure switch value. Possible Causes: L/R pressure switch
circuit open, shorted to ground or to power L/R solenoid switch valve is stuck in "lockup" position L/R solenoid is damaged or
has failed Solenoid pack is damaged or has failed (causing this code) Valve body bolt torque is out of specification.
P0788 1T: A/T Additional 2/4 Pressure Switch Circuit Malfunction Conditions: Engine started; vehicle driven to a speed of 4-37
mph in Drive, and the PCM detected an invalid 2/4 Pressure Switch circuit pressure. Possible Causes: 2/4 pressure switch
circuit is open or shorted to ground 2/4 pressure switch circuit is shorted to TCR output circuit 2/4 solenoid is damaged or has
failed.
P0789 1T: A/T Overdrive/2/4 Pressure Switch Circuit Malfunction Conditions: Engine started; vehicle driven in 1st, 2nd or 3rd
Gear at an engine speed over 1000 rpm, and the TCM detected the O/D or 2/4 Pressure switch did not close (test fails twice to
set a code). Possible Causes: Extremely low battery (system) voltage 2/4 pressure switch circuit is open or shorted to ground
O/D pressure switch circuit is open or shorted to ground.
DTC Trouble Code Title, Conditions & Possible Causes:
P0790 1T: A/T Malfunction Immediately After Shift Event Conditions: Engine started; vehicle driven to a speed over 10 mph in
Drive, and the TCM detected a Speed Ratio error within 1.3 seconds of a shift. Possible Causes: Transmission internal
mechanical problem.
P0791 1T: A/T Loss of Prime Malfunction Conditions: Engine started; vehicle driven to a speed of 4-37 mph in Drive, and the
vehicle exhibited a "no drive" condition during the CCM test. Possible Causes: ATF cooler lines damaged or leaking ATF fluid
level incorrect or filled with debris Customer complains of "no Van drive" condition Oil pump pressure drop occurs with "no drive"
condition Transmission filter clogged or restricted.
P0792 1T: Battery Was Disconnected Conditions: Key on and the TCM detected an interruption of the Battery Direct Power (B+)
circuit. Possible Causes: Battery direct power (B+) circuit is open (test power to PDC) Battery direct power (B+) circuit is shorted
to ground (test fuse) Battery was discharged to a low voltage state or disconnected scan tool "quick learn" for quick disconnect
function performed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0793 1T: Torque Management Request Circuit Malfunction Conditions: Key on and the TCM did not detect any signals on the
Torque Management Request circuit. Possible Causes: Extremely low battery (system) voltage Torque management request
circuit is open, shorted to ground or shorted to system power (i.e., the TRD circuit has failed) or the TCM has failed.
P0794 1T: A/T Speed Sensor Ground Circuit Malfunction Conditions: Engine started; gear selector position indicating Neutral,
and the PCM an error in the Output Speed Sensor signal during the test. Possible Causes: Extremely low battery (system)
voltage TCM "reset" function has just been performed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0795 1T: Transmission Control Module Internal Malfunction Conditions: Engine started; gear position is Neutral, and the PCM
detected the engine model stored in RAM was different than the EEPROM value. Possible Causes: Extremely low battery
(system) voltage Engine "starts" since set counter less than three (3).
P0796 1T: A/T Additional AutoStick Input Circuit Malfunction Conditions: Engine started; vehicle driven to a speed of 4-37 mph
in Drive, and the PCM detected a problem on the AutoStick signal circuit. Possible Causes: AutoStick switch ground circuit is
open AutoStick downshift switch is stuck in open or closed position AutoStick downshift Sensor circuit is open or shorted to
ground AutoStick switch power circuit is open (test power at Fused B+) AutoStick Upshift switch is stuck in open or closed
position AutoStick Upshift switch Sensor is open or shorted to ground.
P0797 1T: A/T Manual Shift Overheat Malfunction Conditions: Engine started; vehicle driven to a speed over 30 mph in Drive,
and the TCM detected A Manual Shift Overheat condition was present. Possible Causes: ATF fluid level too high (transmission
may be overfilled) Engine Cooling System or engine cooling fan malfunction Excessive drive time in low gear, or aggressive
drive patterns Transmission oil cooler is clogged or restricted.
DTC Trouble Code Title, Conditions & Possible Causes:
P0798 1T: A/T Transmission Fluid Is Burnt Or Contaminated Conditions: Engine started; vehicle driven to a speed over 30 mph
in Drive, and the TCM detected a vehicle "shutter" condition during TCC lockup. Possible Causes: ATF is burnt, contaminated or
very dirty extremely low battery (system) voltage Transmission pan has debris Transmission has internal damage causing the
vehicle shudder.
P0799 1T: A/T Calculated Oil Temperature in Use Malfunction Conditions: Engine started; vehicle driven to a speed over 30
mph in Drive, and the TCM detected A Manual Shift Overheat condition was present. Possible Causes: TFT Sensor signal
circuit is open TFT Sensor ground circuit is open TFT Sensor signal circuit is shorted to ground TFT Sensor signal circuit is
shorted to VREF (5v) TFT Sensor signal not correct for the ATF fluid temperature Speed Sensor signal circuit is open or shorted
to ground Speed Sensor signal circuit is shorted to system power TCM oil temperature Sensor high or low circuit has failed.

 

DTC Trouble Code Title, Conditions & Possible Causes:
P0899 1T: A/T Park Neutral Switch Stuck in Park Position or In Gear Conditions: Key on or engine running (while not in Limp-In
mode), gear selector in Park, Neutral or Drive position, and the PCM detected an invalid P/N position switch state for a given
mode of vehicle operation. Possible Causes: P/N switch signal circuit is open between the switch and PCM P/N switch signal
circuit is shorted to Sensor or chassis ground P/N switch ground circuit is open (at the switch mounting point) P/N switch is stuck
in P/N position, or stuck in Drive position P/N switch is damaged or has failed PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0302 1T: Ignition Coil No. 1 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 1 secondary "burn time" was insufficient, or it was missing. Possible Causes: Intermittent condition Cylinder No.
1 spark plug or wire is damaged or it has failed Ignition Coil No. 1 is damaged or it has failed Ignition coil control circuit is open
or shorted to ground ASD relay output circuit problems PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0305 1T: Ignition Coil No. 2 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 2 secondary "burn time" was insufficient, or it was missing. Possible Causes: Intermittent condition Cylinder No.
2 spark plug or wire is damaged or it has failed Ignition Coil No. 2 is damaged or it has failed Ignition coil control circuit is open
or shorted to ground ASD relay output circuit problems PCM has failed.
P0308 1T: Ignition Coil No. 3 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 3 secondary "burn time" was insufficient, or it was missing. Possible Causes: Intermittent condition Cylinder No.
3 spark plug or wire is damaged or it has failed Ignition Coil No. 3 is damaged or it has failed Ignition coil control circuit is open
or shorted to ground ASD relay output circuit problems PCM has failed.
P0311 1T: Ignition Coil No. 4 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 4 secondary "burn time" was insufficient, or it was missing. Possible Causes: Intermittent condition Cylinder No.
4 spark plug or wire is damaged or it has failed Ignition Coil No. 4 is damaged or it has failed Ignition coil control circuit is open
or shorted to ground ASD relay output circuit problems PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0314 1T: Ignition Coil No. 5 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 5 secondary "burn time" was insufficient, or it was missing. Possible Causes: Intermittent condition Cylinder No.
5 spark plug or wire is damaged or it has failed Ignition Coil No. 5 is damaged or it has failed Ignition coil control circuit is open
or shorted to ground ASD relay output circuit problems PCM has failed.
P0317 1T: Ignition Coil No. 6 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 6 secondary "burn time" was insufficient, or it was missing. Possible Causes: Intermittent condition Cylinder No.
6 spark plug or wire is damaged or it has failed Ignition Coil No. 6 is damaged or it has failed Ignition coil control circuit is open
or shorted to ground ASD relay output circuit problems PCM has failed.
P0320 1T: Ignition Coil No. 7 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 7 secondary "burn time" was insufficient, or it was missing. Possible Causes: Cylinder No. 7 spark plug or wire
is damaged or it has failed Ignition Coil No. 7 is damaged or it has failed Ignition coil control circuit is open or shorted to ground
PCM has failed.
P0323 1T: Ignition Coil No. 8 Secondary Circuit Insufficient Ionization Conditions: Engine started; and the PCM detected the
Ignition Coil No. 8 secondary "burn time" was insufficient, or it was missing. Possible Causes: Cylinder No. 8 spark plug or wire
is damaged or it has failed Ignition Coil No. 8 is damaged or it has failed Ignition coil control circuit is open or shorted to ground
PCM has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0503 1T: Charging System Voltage Low Conditions: Engine started; engine speed over 1157 rpm; PCM detected the Battery
Sense voltage was 1v less than the Charging system voltage "goal" for 13.47 seconds during the CCM test. The PCM senses
the battery voltage turns off the field driver and then senses the battery voltage again. If the voltages are the same, the DTC is
set. Possible Causes: Battery sense circuit has a high resistance condition Generator ground circuit has a high resistance
condition Generator field ground circuit is open Generator field control circuit is open or shorted to ground Generator is damaged
or it has failed.
P0700 1T: A/T L/R Inadequate Element Volume Detected Conditions: Engine started; transmission fluid temperature more than
110°F, vehicle driven, and the PCM updated the L/R volume (during a 3-1 or 2-1 Manual downshift) with the throttle angle less
than 5 degrees, and it detected that the L/R volume fell below 16 during the test. Possible Causes: L/R volume clutch index is
too low TCM L/R volume clutch circuit is damaged or has failed.
P0701 1T: A/T 2C Inadequate Element Volume Detected Conditions: Engine started; transmission fluid temperature more than
110°F, vehicle driven, then after the PCM updated the 2C volume (during a 3-2 kickdown event) with the throttle angle from 10-
54 degrees, the PCM detected that the 2C volume fell below 5 during the CCM test. Possible Causes: 2C volume clutch index is
too low TCM 2C volume clutch circuit is damaged or has failed.
DTC Trouble Code Title, Conditions & Possible Causes:
P0702 1T: A/T O/D Inadequate Element Volume Detected Conditions: Engine started; transmission fluid temperature more than
110°F, vehicle driven, then after he PCM updated the O/D volume (during a 2-3 Upshift event) with the throttle angle from 10-54
degrees, the PCM detected that the O/D volume fell below 5 during the CCM test. Possible Causes: O/D volume clutch index is
too low TCM O/D volume clutch circuit is damaged or has failed.
P0704 1T: A/T 4C Inadequate Element Volume Detected Conditions: Engine started; transmission fluid temperature more than
110°F, vehicle driven, then after the TCM updated the 4C volume (during a 3-4 Upshift event) with the throttle angle from 10-54
degrees, the PCM detected that the 4C volume fell below 5 during the CCM test. Possible Causes: 4C volume clutch index is
too low TCM 4C volume clutch circuit is damaged or has failed.
P0706 1T: A/T MS Solenoid Circuit Malfunction Conditions: Engine started; vehicle driven in a forward gear, and immediately
after a gear ratio or pressure switch change, the TCM detected a detected a MS solenoid error. The PCM sets this code when it
detects three consecutive solenoid continuity test faults; or 1 failure if the test is run in response to a gear ratio of pressure
switch fault. Possible Causes: Check for a loose connector to the MS solenoid (intermittent) MS solenoid control circuit is open
or shorted to ground MS solenoid control circuit is shorted to system power (B+) MS solenoid is damaged or it has failed
Transmission control relay output supply circuit is open TCM MS solenoid circuit is damaged or it has Failed.
Glossary of Terms & Acronyms
(<) - Indicates less than the value
(>) - Indicates more than the value
A/C - Air Conditioning System
A/D - Analog to Digital Converter
A/F - Air Fuel Ratio
A/T - Automatic Transmission
ABS - Antilock Brake System
ACM - Airbag control Module
AIR - Secondary Air Injection System
AIS - Automatic Idle Speed
ASD - Automatic Shutdown Relay
AWD - All Wheel Drive
B+ - Battery Voltage
BARO - Barometric Pressure Sensor
BCM - Body Control Module
BOB - Breakout Box
BTDC - Before Top Dead Center
CANP - EVAP Canister Purge Solenoid
CARB - California Air Resources Board
CCD - Chrysler Collision Detection Serial Data Bus
CCP - Comprehensive Component Monitor
CCS - Coast Clutch Solenoid
CKP - Crankshaft Position
CKT - Circuit
CMP - Camshaft Position
CNG - Certified Natural Gas
CO - Carbon Monoxide
CO2 - Carbon Dioxide
CTRL - Control
CYL - Cylinder
DI - Distributor Ignition
DIS - Direct Ignition System
DLC - Data Link Connector
DOHC - Double Overhead Cam Engine
DTC - Diagnostic Trouble Code
DRL - Daytime Running Lights
DVOM - Digital Volt/Ohm Meter
EATX - Electronic Automatic Transaxle
EBCM - Electronic Brake Control Module
EBTCM - Electronic Brake T/C Module
ECT - Engine Coolant Temperature
DaimlerChrysler
OBD II GLOSSARY
EEPROM - Electronic Erasable Programmable Read Only Memory
EFI - Electronic Fuel Injection
EGR - Exhaust Gas Recirculation
EGR Monitor - OBD II EGR Test
EI - Electronic Ignition System
EMCC - Electronically Modulated Converter Clutch
EPA - Environmental Protection Agency
EVAP - Evaporative Emission System
FAN - Cooling Fan (Low or High Speed)
FF - Flexible Fuel Vehicle
FTP - Fuel Tank Pressure
FWD - Front Wheel Drive
GEM - Generic Electronic Module
GND - Electrical ground connection
GPS - Governor Position Sensor
GVW - Gross Vehicle Weight
HC - Hydrocarbons
HMSL - High Mounted Stop Lamp
O2 (B1 S1) Bank 1, Sensor 1
O2 (B1 S2) Bank 1, Sensor 2
O2 (B2 S1) Bank 2, Sensor 1
O2 (B2 S2) Bank 2, Sensor 2
O2 - Heated Oxygen Sensor
Hz - Hertz
IAC - Idle Air Control Sensor
IAT - Intake Air Temperature Sensor
ICM - Ignition Control Module
IGN GND - Ignition Ground
ISO - International Standards Organization
JTEC - Jeep/Truck Engine Control Module
KAM - Keep Alive Memory
KAPWR - Direct Battery Power
Kg/cm2 - Kilograms/Cubic Centimeters
KOEC - Key On, Engine Cranking
KOEO - Key On, Engine Off
KOER - Key On, Engine Running
KS - Knock Sensor
LDP - Leak Detection Pump
LED - Light Emitting Diode
LONGFT - Long Term Fuel Trim
LOOP - Engine Operating Loop Status
LPG - Liquid Petroleum Gas
MAF - Mass Airflow (Sensor)
MAP - Manifold Air Pressure
MFI - Multiport Fuel Injection
MIL - Malfunction Indicator Lamp
MPD - Manifold Pressure Differential
MPH - Miles Per Hour
MPI - Multiport Injection (relay)
M/T - Manual Transmission
MTV - Manifold Tuning Valve
Ms(ms) - Milliseconds
MV(mv) - Millivolt
NGV - Natural Gas Vehicles
NOx - Oxides of Nitrogen
NTC - Negative Temperature Coefficient
OBD I - On Board Diagnostics Version I
OBD II - On Board Diagnostics Version II
ORD - Overdrive Running Clutch
OSS - Output Speed Shaft
PCI - Programmable Communications Interface
PCM - Powertrain Control Module
PCV - Positive Crankcase Ventilation
PDC - Power Distribution Center
PFI - Port Fuel Injection
PID - Parameter Identification Location
PNP - Park Neutral Position (switch)
PSP - Power Steering Pressure (switch)
PWR GND - Power Ground for PCM
PWM - Pulse width Modulated (signal)
RAM - Random Access Memory
ROM - Read Only Memory
RPM - Revolutions Per Minute
RWD - Rear Wheel Drive
S/C - Speed Control
SBEC - Single Board Engine Controller
SCI - Serial Communication Interface
SFI - Sequential Fuel Injection
SIL - Shift Indicator Lamp
SKIM: Sentry Key Immobilizer Module
SMEC- Single Module Engine Controller
SOHC - Single Overhead Cam Engine
SRI - Service Reminder Indicator
SRS - Supplemental Restraint System
TAC - Thermostatic Air Cleaner
TACH - Tachometer (signal)
TBI - Throttle Body Injection
TCC - Torque Converter Clutch
TCCS - Torque Converter Clutch Solenoid
TCM - Transmission Control Module
TCS - Traction Control Switch
TDC - Top Dead Center
TPS - Throttle Position Sensor
TRS - Transmission Range Switch
TSB - Technical Service Bulletin
TTS - Transmission Temp. Sensor
Turbo - Turbo Charged
TWC - Three Way Catalyst
VAC - Vacuum
VAF - Volume Airflow (Sensor)
VECI - Vehicle Emission Control Information (Label)
VREF - Reference Voltage (from PCM)
VSS - Vehicle Speed Sensor
WOT - Wide Open Throttle