Low Speed (15-30 mph) Final Drive Whine Noise - keywords drive final gear howl internal low moan noise slow speed
| Subject: | Low Speed (15-30 mph) Final Drive Whine Noise |
| Models: | 2007-2008 Cadillac DTS |
| 2007-2008 Buick Lucerne |
| with 4T80E transaxle |
This PI was superceded to advise repair is not available at this time. Please discard PIP4231E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Several TAC cases with reported final drive whine noise. Noise seems to be present in the 15-30 mph range. Noise should be evaluated at approximately 19 mph with radio off; HVAC should be on fan speed 3. Compare complaint vehicle to like vehicle. If complaint vehicle is not louder than like vehicle and noise can't be heard above fan speed 3 with radio off then this may be a normal charateristic of this vehicle.
Recommendation/Instructions:
Engineering is aware of the concern and is working on a repair procedure.
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.
