Home · 2012 GMC Sierra 2500 Hd · Complaints

What 59 owners told NHTSA about the 2012 GMC Sierra 2500 Hd

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (59)Crash / fire / injury (8)Airbags (12)Electrical system (11)Body & structure (10)Engine (8)Transmission & drivetrain (6)Fuel system (5)Brakes (4)Speed control (3)Steering (3)Suspension (3)

3 of 59 complaints match · Speed control · clear filters

Aug 2, 2023Transmission & drivetrainElectrical systemSpeed control

Failed TRANSMISSION CONTROL MODULE (24256861). While driving in the early morning hours (darkness) taking my child to school, I was navigating through a busy intersection when the vehicle surged and then made a loud metal on metal sound, feeling as if someone had struck me from behind. At that point the power train became inoperable, stranding us and coming very close to being first, struck from behind and then from cross traffic. The vehicle was/has been inspected by a GM technician at Starling Chevrolet, St Cloud, FL and the TCM was found to have failed (trouble code U0101, lost communication with TCM). It has been at the dealership for going on four months awaiting the production of a replacement part(TCM). There was no prior indication that the TCM was about to fail. Upon failure, all lights on the vehicle display flashed and the indicator for the vehicle drive position was lost (P, R, N, D), no longer visible.

NHTSA ODI 11536038

Jun 24, 2013Speed control

TL* THE CONTACT OWNS A 2012 GMC SIERRA K-1500. THE CONTACT STATED THAT WHILE DRIVING 75 MPH, THE VEHICLE BEGAN TO DECELERATE AS THE WARNING LIGHTS IN THE INSTRUMENT PANEL ILLUMINATED. THE VEHICLE WOULD NOT ACCELERATE BEYOND 35 MPH. THE FAILURE WAS RESOLVED MOMENTARILY AFTER THE VEHICLE WAS RESTARTED BUT SOON RECURRED. THE VEHICLE WAS TAKEN TO THE DEALER, BUT THEY WHERE UNABLE TO DUPLICATE THE FAILURE. THE FAILURE WAS NOT REPORTED TO THE MANUFACTURER. THE FAILURE MILEAGE WAS 7,000. THE CURRENT MILEAGE WAS 20,000. KMJ

NHTSA ODI 10521476

Oct 19, 2012Speed control

TL* THE CONTACT OWNS A 2012 GMC SIERRA. THE CONTACT STATED THAT WHILE DRIVING UPHILL AND ATTEMPTING TO DECELERATE. THE VEHICLE ACCELERATED ABNORMALLY. IN ORDER TO STOP THE VEHICLE, THE CONTACT ABRUPTLY APPLIED THE BRAKES AS THE ENGINE EXHIBITED A LOUD THUMP. THE CONTACT TOOK THE VEHICLE TO THE DEALER BUT THEY WERE UNABLE TO DUPLICATE THE FAILURE. THE FAILURE AND THE CURRENT MILEAGES WERE 5,545. UPDATED 13/13/12 *CN

NHTSA ODI 10481134

Working with the data? Download all 59 complaints as CSV · fetched from NHTSA July 19, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2012 GMC Sierra 2500 Hd verdict →