2018 GMC SIERRA 1500 Complaints

My rear back heated window on the passenger side popped and shattered the window while I was sitting in the passenger’s seat waiting for my husband. The truck smelled like a sweet wire smell and then I heard a loud pop. I looked back and the back window panel was shattered. I do see that there were recalls on some of these windows.

While driving parking lot speeds, when I pressed the brake pedal, it was very very difficult to push causing me to nearly rear end the car in front of me. This happened intermittently during a short time frame (5 minutes). While standing on the brake pedal hoping to stop in time, the brake pedal shook like the Antilock brakes were activating. This caused it to be even more difficult to stop in time. My vehicle is currently at my local dealership's service shop. When the issue occurred, a message stating "Service Brake Assist" popped up in my display.

The contact owns a 2018 GMC Sierra 1500. The contact stated while driving approximately 70 MPH, the trailer wiring harness system warning message was illuminated. The vehicle was taken to a local dealer where it was diagnosed with needing the wiring harness replaced; however, the vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 77,000.

Driver's side seat belt receptacle does not hold. It is difficult to get seatbelt to latch properly. Sometimes it latches and releases later. Dealer confirmed seat belt receptacle needed to be replaced.

At 50,000 miles the "service trailer brake system" error message appears constantly due to factory defects and its very common. These trucks should be recalled everyone is in danger on the roads and its a very common problem. I have not taken it to the dealer because i should not have to pay for this very common problem, it should be recalled.

During down shifting in lower gears while reducing speed , transmission makes a loud noise followed by vehicle hard lounging forward . Occurance is intermittent and unpredictable . In city traffic this has potential to cause an accident because vehicle lounges forward when speed is reduced . Vehicle has 18900 miles . Made in 2017 .

VEHICLE VIOLENTLY SHAKES AT ALL SPEEDS. DEALER BLAMED TIRES, I HAD NEW TIRES INSTALLED, STILL SHAKING. DEALER SAYS "NO PROBLEM FOUND, OPERATING AS DESIGNED" TRUCK IS A NUISANCE TO DRIVE, SHAKING BADLY

Driver Assist-Lane Keeping Assist-Forward Collision Warning-Automatic Emergency Breaking Life Threatening When System Fails and is Intermittent . Vehicle has been said to be dangerous to drive by GM Tech/Can cause life threatening conditions. Fault has been confirmed by Dealership. WARNING LAMP> "SERVICE DRIVER ASSIST SYSTEM" Friday 3 December 2021 at approximately 21340 miles.

The truck displayed warning lights for ABS, traction control, trailer brakes, and front park assist. Additionally speed control (cruise) did not function. This presented a safety issue. I took to dealer asap. They repaired by replacing left rear wheel speed sensor. Cost about $216. Appears to work correctly at this time.

TRANSMISSION IS SLAMMING VIOLENTLY DURING SHIFTING, TRANSMISSION FLUID IS DARK AND CONTAMINATED. DEALER SAYS-" OPERATING AS DESIGNED, NO ISSUE FOUND" ALSO TRUCK SHAKES AND VIBRATES VIOLENTLY WHILE DRIVING