Envoy 2WD V8-5.3L VIN M (2005)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Controls - Low Speed Throttle Tip-In Clunk Noise
Bulletin No.: 05-06-04-017
Date: March 07, 2005
TECHNICAL
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(R) is updated
with the latest software version.
Warranty Information
Disclaimer
