Electrical System Related Problems of the 2012 GMC Sierra 1500

Table 1 shows two common electrical system related problems of the 2012 GMC Sierra 1500. The number one most common problem is related to the electrical system (seven problems). The second most common problem is related to the instrument panel speedometer/odometer (one problem).

Table 1. Electrical System related problems of GMC Sierra 1500


Recently reported Electrical System problems of the 2012 GMC Sierra 1500

The Electrical System problem

June 29, 2025, driving on the st. Francis loop in amarillo, TX, brake lights start flashing, the warning sounds happening, no brakes. I had already slowed down to 35-45 mph due to road construction ahead. I weaved through the cones and as soon as possible, hit the ditch and then coasted to a stop.   Read details...

The Instrument Panel Speedometer/odometer problem

Odometer fraud. The contact purchased a 2012 GMC Sierra 1500. The contact stated that it was discovered that there was a mileage discrepancy. The vehicle was a private sale. At the time of purchase, the mileage was 111,000, and at the time of registration, it was discovered that the mileage was   Read details...


Electrical System related problems in other GMC Sierra 1500 model year vehicles:



Sierra 1500 Service Bulletins
Sierra 1500 Safety Recalls
Sierra 1500 Defect Investigations