GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, my name is Bobby. Thank yiou for the question. Can you tell me if all of these issues appeared to start at the same time or at different times?
Thank you. Can you tell me if it seems as if the idle is getting really low at that time also?
Thank you. These problems may or may not be related. I would first check charging voltage. If the voltage in the system drops low enough then both of these problems will occur. This vehicle has a history of battery cable issues that will cause voltage problems. If all of this is fine then the noise or vibration may be from the cylinder shit down system. If the solenoid pack is failing or if you have a cheap oil filter on the vehicle then this will occur. The brake and traction control issue may be the result of a failing steering sensor or yaw sensor. Both of these are common also on this vehicle. Did you plan on fixing this yourself?
I wouldn't. The best thing to do would be to install a scan tool that reads these modules and see what they say when the lights come on.