I would have to suggest that you have your vehicle checked out by your local dealership. Depending on your current mileage you may still be under the 3 year 36,000 mile bumper to bumper warranty or you should still be under the 5 year 100,000 mile powertrain warranty as well. Either of these warranties should cover you for the fix, under normal circumstances. I hope that helps.
Jeff Morris, GMC Customer Service