Throttle Tip-in Clunk Noise at Low Speeds (Reprogram ECM)
| Subject: | Throttle Tip-in Clunk Noise at Low Speeds (Reprogram ECM) |
| Models: | 2005 Buick Rainier |
| 2005 Chevrolet TrailBlazer Models |
| 2005 GMC Envoy Models |
| with 5.3L Gasoline Engine (VIN M -- RPO LH6) |
Condition
Some customers may comment on a clunk type noise on light throttle tip-in at low speeds. The clunk type noise may be evident but not as significant at higher speeds.
Cause
Torque reversal in the driveline may cause this condition. Engineering made Calibration changes to increase air flow during a decel to help keep a positive driveline torque. These air flow changes also drive changes to the cruise control operation.
Correction
Reprogram the ECM with calibration P/N 12597129 or P/N 12597130 using the appropriate Service Information (SI) procedures. The new calibrations were released beginning with TIS satellite data update version 11 for 2004, available November 2004. As always, make sure your TECH 2® is updated with the latest software version.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6354 | Module, Engine Control - Reprogram | Use published labor operation time |
