| Subject: | 6.0 Accessory Drive Belt Chirp |
| Models: | 2003-06 Cadillac Escalade |
| 2003-2006 Chevrolet Silverado |
| 2003-2006 GMC Sierra, Yukon |
| Equipped with the 6.0 LS2, LQ4, or LQ9 engines and the 4L65E M32 transmission |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment on a chirp or squeal or squawk noise on a WOT (wide open throttle) 1-2 upshift. This chirp or squeal might be interpreted as a noise coming from the transmission because it occurs during the upshift. Please be sure to verify
the chirp noise is not accessory drive belt related before attempting transmission repairs.
Recommendation/Instructions:
If the noise is determined to be coming from the accessory drive belt complete the current SI diagnostics for drive belt chirping, drive belt squeal, drive belt whine, or drive belt rumbling. Make repairs to the accessory drive belt as needed. Evaluate
the WOT belt chirp after the repairs are completed
If the belt chirp noise is not repaired with a drive belt replacement, or reoccurs shortly after a drive belt is replaced, please complete a field product report as directed in bulletin number 02-00-89-002E.
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.
