A/T - Shift Hesitation/Engine Flare/Harsh Cold Shifts
Bulletin No.: 04-07-30-043Date: December 02, 2004
TECHNICAL
Subject:
Automatic Transaxle Shift Hesitation/Engine Flare During 2-3 Shift At Light Throttle and/or Harsh Reverse to Drive Shift, Both at Cold Operating Temperatures (Reprogram Transaxle Control Module (TCM))
Models:
2005 Chevrolet Equinox
with All Wheel Drive (AWD) (RPO M45) and Front Wheel Drive (FWD) (RPO M09)
Built Prior to:
VIN Breakpoint with All Wheel Drive (AWD) 56091857
VIN Breakpoint with Front Wheel Drive (FWD) 56091812
Condition
Some customers may comment on a hesitation/engine flare during the 2-3 shift and/or a harsh reverse to drive garage shift, both at cold operating temperatures.
Diagnosis may show a false power steering code DTC C0000 set with NO service vehicle soon light on.
Cause
The TCM calibration may be the cause.
Correction
1. Reprogram the Transaxle Control Module (TCM) with a new service calibration released with TIS satellite data update version 11.25 on November 15, 2004 or newer. Refer to Service Programming System (SPS).
Important:
^ An in-depth road test drive procedure is required to allow the TCM to adapt/"fine tune" the software calibrations to the transaxle in order to achieve optimum performance and shift characteristics.
^ If any of the road test/relearn procedure is not completed as outlined during the service visit to the dealership, it is possible that the customer may experience a less than desired or uncharacteristic shift quality for that certain shift point until the adaptive values for that shift are adapted by the TCM.
^ This "uncharacteristic shift quality" should not be misunderstood as an internal transaxle concern unless the concern continues after the complete relearn procedure has been completed.
1. Perform the transmission adaptive learn procedure.
Warranty Information
For vehicles repaired under warranty, use the table.
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