Trouble codes, Grrrrr
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Veteran
Joined: May 2009
Posts: 353
Likes: 1
From: Sultan, WA
Trouble codes, Grrrrr
Okay, so the check engine light came on last Tuesday. Turned off sometime between Friday and Sunday as it sat.
Trouble Codes:
P0846
P0871
P0988
P0876
P0882
I found info on the first four, but can't find anything on last one.
Thoughts?
BTW, I had my new winch installed on Tuesday. Engine light came on after driving for about an hour and it parking for another two ~ hours.
Trouble Codes:
P0846
P0871
P0988
P0876
P0882
I found info on the first four, but can't find anything on last one.
Thoughts?
BTW, I had my new winch installed on Tuesday. Engine light came on after driving for about an hour and it parking for another two ~ hours.
Veteran
Joined: Jun 2011
Posts: 387
Likes: 18
As I'm sure you've already discovered, the first four are pointing to rationality faults for the transmission pressure switches.
I took a look in the service manual, and following the troubleshoot for P0846, there's a line that says if there are two or more related pressure switch rationality DTCs present, and if (hypothetically) the event data indicates they all read closed, to preform diagnostics for P0888. Looking at P0888, I found this:
P0882 wasn't in the service manual, but a general internet search pulled up this:
It all sounds like an electrical power issue. You said you just had a winch installed, did they make all the proper connections or disconnect anything they shouldn't have? Is the TCM plug secure?
Also going with P0882 from above, it mentions that if power supply to the TCM is cut off from a removed (disconnected) battery, and the self-diagnostics memory function stops, that it will detect a malfunction. Maybe they hadn't properly reconnected the battery right the first time and it interrupted the self-diagnostic?
If it were me, I would disconnect the battery overnight and let the PCM/TCM do a hard reset.
I took a look in the service manual, and following the troubleshoot for P0846, there's a line that says if there are two or more related pressure switch rationality DTCs present, and if (hypothetically) the event data indicates they all read closed, to preform diagnostics for P0888. Looking at P0888, I found this:
Set Condition:
This DTC is set when less than 3.0 volts are present at the transmission control relay output circuits at the
Powertrain Control Module when the PCM is energizing the relay.
Possible Causes:
(A104) FUSED B+ CIRCUIT OPEN
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND
(T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN
(T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND
(Z915) TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN
TRANSMISSION CONTROL RELAY STUCK OPEN
POWERTRAIN CONTROL MODULE
Theory of Operation:
The transmission control relay is used to supply power to the solenoids and pressure switches when the transmission
is in normal operating mode. The relay output is fed back to the TCM through pins 16, 17, and 36. It is referred
to as "Transmission Control Relay Output". This circuit does not supply power to the TCM, it is only a sense circuit.
When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in
"limp-in" or "default" mode. Note: Inadequate Transmission Control Relay Output voltage can also cause DTCs
P0846, P0869, P0871, P0876 or P0988 to set. This does not indicate an internal transmission or solenoid/
TRS problem. Repairing the P0888 fault should also eliminate the related DTCs.
This DTC is set when less than 3.0 volts are present at the transmission control relay output circuits at the
Powertrain Control Module when the PCM is energizing the relay.
Possible Causes:
(A104) FUSED B+ CIRCUIT OPEN
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND
(T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN
(T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND
(Z915) TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN
TRANSMISSION CONTROL RELAY STUCK OPEN
POWERTRAIN CONTROL MODULE
Theory of Operation:
The transmission control relay is used to supply power to the solenoids and pressure switches when the transmission
is in normal operating mode. The relay output is fed back to the TCM through pins 16, 17, and 36. It is referred
to as "Transmission Control Relay Output". This circuit does not supply power to the TCM, it is only a sense circuit.
When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in
"limp-in" or "default" mode. Note: Inadequate Transmission Control Relay Output voltage can also cause DTCs
P0846, P0869, P0871, P0876 or P0988 to set. This does not indicate an internal transmission or solenoid/
TRS problem. Repairing the P0888 fault should also eliminate the related DTCs.
P0882 - Transmission Control Module Power Input Signal Low
Possible causes:
- Transmission Control Module (TCM) harness is open or shorted
- Transmission Control Module (TCM) circuit poor electrical connection
- Low battery power
- Faulty Transmission Control Module (TCM)
Tech notes:
sometimes this code is triggered when the battery charge gets too low or is replaced. Cleared the code and drive the vehicle. If the code comes back and there are no other symptoms, you may have to replaced the Transmission Control Module (TCM).
Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
P0882 Description:
When the power supply to the Transmission Control Module (TCM) is cut “OFF”, for example because the battery is removed, and the self-diagnostics memory function stops, malfunction is detected.
- Transmission Control Module (TCM) harness is open or shorted
- Transmission Control Module (TCM) circuit poor electrical connection
- Low battery power
- Faulty Transmission Control Module (TCM)
Tech notes:
sometimes this code is triggered when the battery charge gets too low or is replaced. Cleared the code and drive the vehicle. If the code comes back and there are no other symptoms, you may have to replaced the Transmission Control Module (TCM).
Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
P0882 Description:
When the power supply to the Transmission Control Module (TCM) is cut “OFF”, for example because the battery is removed, and the self-diagnostics memory function stops, malfunction is detected.
Also going with P0882 from above, it mentions that if power supply to the TCM is cut off from a removed (disconnected) battery, and the self-diagnostics memory function stops, that it will detect a malfunction. Maybe they hadn't properly reconnected the battery right the first time and it interrupted the self-diagnostic?
If it were me, I would disconnect the battery overnight and let the PCM/TCM do a hard reset.