The best way to have this problem diagnosed would be to take your vehicle to the dealership and have a service technician take it for a ride with you so that they can hear the noise.
It's hard to diagnose this problem without driving the vehicle and hearing the noise. It could just be an issue with the tires, they should be able to tell you after they hear the noise.
〉 Answered on Apr 24th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines
Zoey, You most likely are hearing the power steering pump whine or your alternator. Have an auto parts store test your alternator to verify prime operation.
There is a common issue on this vehicle with noise from the rear differential on sharp turns (parking lot maneuvers). First, verify that all 4 tires are the same, including tread depth. Tires on this vehicle should always be replaced as a set. Uneven tread depth from one tire to the next will cause damage to the differentials/AWD system.
If all 4 tires are the same, there is a service bulletin for replacing the rear differential fluid with an upgraded fluid. Depending on the condition of the internals of the rear differential, the rear differential may need to be rebuilt.
You do not have to go to the dealer for this, but make sure the repair shop you choose knows to use the correct fluid and follow GM's procedures for fluid replacement to correct this condition.
〉 Answered on Oct 25th, 2013 by Helaine Kurot, Owner/Technician at 360 Automotive
Hi Zoey, From your description. I would have the tire circumference checked. All four tires should be within a 1/4" of each other. This could affect AWD. Another issue could be a faulty wheel bearing. Good luck.
〉 Answered on Oct 25th, 2013 by Maryann Croce, Owner at Croce’s Transmission Specialists