Have a '11 crew which to me,seems like it can't get out of it's own way.Seems very slow and like the tranny isn't right.Is this normal with the '11? I think I read somewhere that that year had a problem with the tranny not being good.Also seems like the mileage has dropped by about a mile a gal as per the on board computer,What would cause this?Now i'm getting about 17.6 thanks for any insight you can give.

 

Tell the dealer what you posted here and have them check for software updates. I also felt that the D's power was a little off also but having it brought up to date seems to have taken care of it.

 

Dnj,

This is the TSB that is currently out regarding shifting issues.

NUMBER: 18-012-11 REV. A
GROUP: Vehicle Performance
DATE: April 26, 2011

SUBJECT:
Flash: MIL Illumination Or Tapping Sound Heard Under Hood At Key Up Or After Key Off
With Driveability And Transmission Improvements
OVERVIEW:
This bulletin involves flash reprogramming the Powertrain Control Module (PCM) and then
the Transmission Control Module (TCM) with new software and then performing a TCM
module initialization.
NOTE: A “Initialize EGS” (TCM module initialization) must be performed after the
reprograming of the PCM and TCM for WK Bodies built before December 20,
2010 to take full advantage of the new software features. If Service Bulletin
18-012-11 has already been performed then a TCM module initialization is not
necessary.
MODELS:
2011 (WD) Durango
2011 (WK) Grand Cherokee

NOTE: This Service Bulletin applies to vehicles equipped with a 3.6L engine (Sales
Code ERB) and NAG1 transmission (Sales Code DGJ) built before March 6,
2011 (MDH 0306XX).
SYMPTOM/CONDITION:
Some customers may notice any of the following;
MIL Illumination
Upon further investigation the Technician may find that any of the following Diagnostic
Trouble Codes (DTC) have been set:
a. P0344 - Camshaft Position Sensor Intermittent - Bank 1 Sensor 1 (WK Body only)
b. P0349 - Camshaft Position Sensor Circuit Intermittent - Bank 2 Sensor 1 (WK Body
only)
c. P0369 - Camshaft Position Sensor Intermittent - Bank 1 Sensor 2 (WK Body only)
d. P0394 - Bank 2 Camshaft Position Sensor 2/2 Circuit Intermittent (WK Body only)
e. P050B - Cold Start Ignition Timing Performance (WK Body only)
f. P0730 - Incorrect Gear Ratio (WK Body only)
g. P0219 - Engine Overspeed (WK Body only)
h. P0108 - Manifold Absolute Pressure Sensor Circuit High (WK/WD Bodies)
i. P0522 - Engine Oil Pressure Sensor Circuit Low (WK/WD Bodies)
j. P06DD - Engine Oil Pressure Control Circuit Stuck Off (WK/WD Bodies)
k. P0298 - Engine Oil Temperature Too High (WK/WD Bodies)
Driveability Improvements or Tapping Sound WK Body only
a. A slight tapping sound is heard from under the hood. This could also be described
as a rattle or clicking sound also. This condition can be heard when the ignition key
is turned to accessory or start or right after ignition key has been turned off. This
condition was caused by a cleaning routine of the cam actuator controller by the
PCM. To correct this condition a calibration change was made to modify the duty
cycle and frequency of the PCM controlled cleaning routine of the cam actuator.
b. At a light throttle tip in (2 to 6%) the RPM may oscillate slightly (+/- 200 rpm). If the
throttle tip in is increased then the issue is not present.
c. Lacks Performance. Some driving conditions can produce circumstances where
some customers may perceive more pedal effort is required to get the Powertrain to
accelerate the vehicle as desired. The PCM calibration for pedal vs. torque
relationship was changed to allow for more torque delivery at less pedal effort/travel.
In accordance with this PCM calibration change, the TCM was re-calibrated to
provide optimal performance and fuel economy. The combined PCM and TCM
software improvements will translate into a feeling of improved performance to the
driver.
d. Customer describdes a temporary ”Loss of Power" event due to transmission going
to Neutral during a heavy throttle 4-3 downshift. This may happen when driving at
moderate speed, 35 to 70 MPH (56 to 112 KPH) when the driver accelerates with
pedal input from 40-100% triggering a 4-3 downshift. The may set the P0730 -
Incorrect Gear Ratio DTC along with the MIL light ON and cause a Neutral condition
within the transmission. This will typically be described as a “Loss of Power”
complaint. The MIL for the P0730 will clear after 3 consecutive ignition cycles
without setting another P0730 DTC. The P0730 DTC will remain stored in the TCM
for 40 consecutive “good” ignition cycles and then be cleared. To correct this
condition the TCM pressure control and torque management were re-calibrated
improve the 4-3 downshift control during these conditions.
18-012-11 REV. A -2-
Transmission Improvements WK Body only:
a. Lack of performance feeling during low vehicle speed turning or cornering
maneuvers. To correct this condition a new TCM feature was developed to detect
when the vehicle is in a turn and will then not perform an upshift.
b. Harsh 3-4-3 change mind shift. This happens when driving at moderate speed of 30
to 50 mph (48 to 80 kmh) when the driver reduces accelerator pedal input to 5-10%.
The TCM then schedules a 3-4 upshift. When the driver accelerates rapidly, pedal
input from 40-100% this will CANCEL the 3-4 upshift and trigger a “change mind”
shift and revert back to 3rd gear. The TCM “change mind” pressure control and
torque management were re-calibrated to smooth the shift control during this
maneuver.
c. Noticeable higher engine RPM during low speed driving. This condition will be
noticed during parking lot or city traffic low speed driving. The TCM logic was refined
to keep the upshift inhibit more linear vs. vehicle speed.
d. Engagement shudder when transmission is shifted into DRIVE or REVERSE
immediately after the vehicle is starting. This shudder is caused by a lack of
hydraulic prime in the transmission pump which requires a higher pressure demand
to the applying clutch to avoid the shudder during the engagement. The TCM logic
was changed to detect an engagement to DRIVE or REVERSE immediately after the
engine starting which will then utilizing a special pressure apply rate ONLY during
these conditions.
e. More pedal effort to maintain speed while towing trailer during HOT ambient
conditions of greater than 100° F (37° C). The TCM logic was optimized to improve
this feeling.
f. Overall Improved shift quality. TCM calibrations were changed to deliver optimal shift
quality during all driving conditions.
g. Poor shift quality when using autostick (-) lever to initiate a transmission down shift.
This will be notice when tapping lever (-) minus around 35 to 45 MPH (56 to 72 KPH)
with a light accelerator pedal input of 5 to 10%. This was caused by B2 clutch apply
pressure being calibrated too high for the 4-3 downshift. The TCM calibration was
changed to lower the B2 clutch apply pressure during this maneuver.