GMC Troubleshooting Questions? Ask a Mechanic for Answers
hi there, I am cam.The most common issue with these is the brake switch. Bad contacts often cause the system to think the brake is pressed. Replace that switch and evaluate the issue.
I don't have a current part number but any part store will have it and they are about 25 or so.AS for the procedure, this is a wire connector, bolt and clip on the side on the side of the brake pedal.