Engine Controls - Noise at Idle/Steering Wheel Vibration

Engine Vibration/Noise at Idle, Vibration Felt in Steering Wheel/Seat (Reprogram PCM) # 05-06-01-006 - (Feb 9, 2005)

Models:
2003-2005 Cadillac Escalade
2003-2005 Chevrolet Tahoe
2003-2005 GMC Yukon

with 4.8L or 5.3L Engine (VINS V, T, Z, - RPOs LR4, LM7, L59)

Condition

Some customers may comment on an engine vibration or noise while the vehicle is in gear at idle. This vibration can be felt in the steering wheel or seat and may intensify if the A/C is turned on. It should be noted that if the engine speed is raised or lowered approximately 50 RPMs, the vibration/noise will be reduced or go away.

Correction

A new service calibration has been released to lower the engine idle speed to 538 RPM in park/neutral and 525 RPM in gear. Before installing the new calibration, use the Tech 2(R) and go into Powertrain/Special Functions/TAC System Engine Speed Control and when the condition is duplicated (engine running, in gear, foot on the brake, A/C on), command the idle down to 525 RPM. If the condition greatly improves or goes away, reprogram the PCM with the Updated software calibration. This new calibration was released with TIS satellite data update version 1.75 available January 26, 2005. As always, make sure your Tech 2(R) is updated with the latest software version.

Also, if the vehicle is a 2004 model, Corporate Bulletin Number 04-06-01-023 may need to be performed.





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