| Subject: | Vibration Felt and Heard At Low RPM During Parking Lot Maneuvers |
| Models: | 2004-2007 Buick Rainier |
| 2002-2008 Chevrolet Trailblazer and Trailblazer EXT |
| 2002-2008 GMC Envoy, Envoy XUV and Envoy XL |
| 2002-2004 Oldsmobile Bravada |
This PI was superseded to update model years. Please discard PIT3516B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
An unusual vibration may be felt and heard at very low RPM, especially during parking lot maneuvers. A rattle may also be heard from under the vehicle that can be felt in the floor as the engine is started due to Powertrain movement. This may be due
to stones and debris caught in the transmission mount, transmitting the noise/vibration into the body.
Recommendation/Instructions:
Remove the mount, clean out the debris and reinstall it. Install a 5.5" (14cm) section of 0.75" (19mm) heater hose into the cavity of the transmission mount to prevent debris from entering the mount. There should be no need to replace the mount on trucks
with this issue.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
