Have you contacted your local dealership? There are many benefits to taking a vehicle to your local dealership. You can guarantee that technicians are ASE certified and that the parts come with a GM parts warranty. For these reasons, I would recommend taking the vehicle to your local dealership to be diagnosed. They should be able to assist you further and have a plan for addressing the issue. I can also look into this issue further. In order to do so, I will need some more specific information from you. If you could please send me your full name, address, phone number, the VIN for the vehicle, and current mileage, I will be able to take further steps. If you have further questions, please feel free to contact me directly. Thank you.
Tricia, GM Customer Service.