Have you taken the vehicle into your dealer for an inspection yet? I see that you are on the cusp of the warranty by mileage, how about by date? If the vehicle is still under warranty, you may be able to have the issue repaired under warranty. I would suggest making an appointment for a diagnosis. The dealer should be able to pinpoint the problem with better accuracy. If you have any further questions, please feel free to contact me.


Louis
GM Customer Service