We purchased from a used car dealer with a one month warranty. We immediately took the family to Disneyland and noticed that after a long period of driving, there is a significant noise that comes from the rear end when turning.

Upon return, the dealer did pay approximately 1/2 of the $800 to shotgun two new hubs at the rear end which did not resolve the issue.

I called a GM dealer to see if this had been serviced in their system, and he mentioned that at 35000 miles, the car did have issues with the AWD module. I don't really know what to do at this point since I can't afford to spend $800/guess.