| Subject: | Howl Whine Noise from Rear Axle |
| Models: | 2003-2007 Cadillac CTS |
| 2006-2007 Pontiac Solstice |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Howl or whine noise from the rear axle on accel and/or decel. The noise is most noticeable at speeds between 35-50 mph (56-80 km/h).
Recommendation/Instructions:
Compare the noise to another identically equipped vehicle with similar mileage and make any necessary repairs. Axle break in procedures must be strictly adhered to during initial break-in as outlined in the Owners Manual. This also applies to any replacement
axles that would be installed in a customer's vehicle. For 500 miles (800 km), it is suggested that rapid acceleration be avoided, as well as to avoid driving at the same speed for more than five or ten minutes at a time. The vehicle should also not be used
for towing during the break-in process.
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.
