2015 GMC Sierra 1500 Complaints

VISIBILITY/WIPER — Filed 11/15/2025

my rear window defrost turned on when i auto started my pickup. i realized it was on after about a half hour and looked back and my drivers side of the rear sliding window was shattered completely

SERVICE BRAKES — Filed 05/01/2026

When backing up, either on a hill or flat surface, the brakes fail to stop the vehicle. There is a pulsing sensation with the brakes due to failure of the vacuum. The brake pedal also becomes impossible to depress. No warning lights appear when this occurs.

SEAT BELTS — Filed 06/07/2026

The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving at 25 MPH, the front driver's seat belt completely failed. The lap belt portion came apart, causing the chest strap to loosen. Upon inspection, the contact observed that the steel anchor cable bolted to the floor had separated. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 153,000.

POWER TRAIN,ELECTRICAL SYSTEM,UNKNOWN OR OTHER — Filed 05/26/2026

For no apparent reason the truck goes into “low power mode” and gives off code p2138 often happens around 30-35 mph. Have had it happen to me also around 45 mph also. I have replaced sensors and parts to which a month or so goes by and it happens again.

SERVICE BRAKES — Filed 05/11/2026

Vehicle doesn't stop in low speeds

SERVICE BRAKES, HYDRAULIC,ELECTRICAL SYSTEM — Filed 05/13/2026

The contact owns a 2015 GMC Sierra. The contact stated that while driving at an undisclosed speed and also while the vehicle was parked, the ABS and stability control warning lights would unexpectedly illuminate. The vehicle was taken to an independent mechanic, where the warning lights were cleared. The contact was informed that if the failure recurred, the EBCM and BPMV would need to be replaced. The vehicle was not repaired. The contact stated that the failure recurred. The vehicle was then taken to the dealer, where it was diagnosed that the EBCM and BPMV had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 90,100.

ENGINE — Filed 04/09/2026

Active Fuel Management Miss firing Idle rough Shaking Loss of power #7 cylinder loss of all compression Bad fuel mileage Skipping

AIR BAGS — Filed 03/21/2026

The contact owns a 2015 GMC Sierra 1500. While traveling on a two-lane highway at approximately 55 MPH, another vehicle suddenly turned into the contact's lane, resulting in a severe frontal "T-bone" collision. The force of the impact caused the other vehicle to be propelled into a ditch, while the contact's vehicle remained on the roadway. Despite the significant nature of the crash and the speed involved, no air bags deployed. The dealer was notified of the failure. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 218,000.

SUSPENSION,STRUCTURE — Filed 03/23/2026

Truck started to make loud clunking noise when driving taken it to two shops and wrong parts were installed as stated below. Bought from a used car dealership and they sold it as is now with the wrong parts.

STRUCTURE — Filed 03/22/2026

Bad paint used by manufacturers that causes frames to rust out.