GMC Complaints

Rear defroster failure. The rear defroster was turned on causing smoke to appear from the power sliding rear window, then the rear window shattered causing glass to fly into the backseat and truck bed.

The car has made a high pitched metallic rattle on cold start ever since I received it. I have taken it into the dealership multiple times for this and have had the lifters in the engine replaced but they never addressed the other noise, which I have video evidence of. The car died at 24,740 miles on the odometer in the middle of a highway in the middle of nowhere. The vehicle started to feel like it was braking on acceleration, there were no warning lights. The vehicle just lost acceleration power and I had to coast to the shoulder. Luckily I had time to pull over without interference from other traffic. Once on the side of the road I tried to crank the car again and a very loud metallic sound happened that sounded like I threw a wrench in a fan. The car lost electrical power very shortly after. I called onstar for help and she asked if I could shift the car into neutral which I could not. They had problems finding anyone that wasn’t hours out that could come tow my car and suggested that I try to find an alternate method of transportation since a wrecker service probably wouldn’t transport my entire family. Uber was not around to get me, Lyft was not around to get me and there was no taxi service. I had to rely on the local fire department to rescue us as it was hours with myself, my two children and my dog on the side of the road in 90F heat. Once at the dealership they confirmed it was indeed a catastrophic engine failure and I am currently waiting months for a back ordered engine with a rental I’m paying partially out of pocket for, in a car that’s entirely way too small for my family with no ETA on the engine in sight. I know multiple people personally who this has also happened to, same exact scenario and same exact engine just different model years.

Turned onto highway. Got up to about 60 miles per hour. After a couple minutes the truck lost all power. Was pressing gas and noticed speed declining. Looked at dash and noticed rpm decreasing. All lights were off in the dash. I let the truck coast to the edge of the highway. Attempted to jump start and replace battery and nothing happened. Had it towed to a mechanic who said the motor was seized up.

Sent vehicle into dealership for a knocking noise turns out the lifters. They drove the vehicle 1 mile only to have the engine seize. I have been without a vehicle for 6 weeks with no engine available

My tailgate will randomly open on its own. I’ve had several instances( 5 or 6 times so far) when I’ve had open on its own. Only once so far when i was driving. Luckily, i was on my private road without anything in my bed that could fall out. I often carry mountain bikes over the tailgate which could pose a serious danger if the tailgate were to open when driving. Also earlier this evening when the tailgate came down on its own while driving, when I got to my destination, I was unable to open the tailgate at all from outside the vehicle. It is apparent the button to release the switch is malfunctioning. I was able to get it to open by using release button inside the vehicle.

Trailer braking and stability control randomly disables. This leaves an unsafe condition when towing any trailers that require a trailer brake controller. Has happened on multiple occasions.

The contact owns a 2017 GMC Acadia. The contact stated while driving at an undisclosed speed, the brake pedal was depressed; however, the brake pedal was firm. The contact applied full pressure to the brake pedal, and the vehicle stopped. There was no warning light illuminated. The vehicle was taken to an independent mechanic where it was diagnosed with brake vacuum pump failure. Additionally, the contact was informed that the brake vacuum pump had fractured, and a part of the brake vacuum pump had lodged into the engine. The contact was informed that the brake vacuum pump needed to be replaced. The vehicle was being repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 115,911.

Top section of front grill (directly below the hood) broke and came up while driving down the highway with no prior indication or damage.

The contact owns a 2024 GMC Sierra 2500. The contact's husband stated that while driving 60 MPH, the vehicle started violently bouncing up and down. There were no warning lights illuminated. The vehicle was taken to a dealer; however, the dealer was unable to duplicate the failure or diagnose the vehicle. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 12,000.

WHEN TURNING TRUCK, POWER STEERING WENT OUT AND MADE IT DIFFICULT TO TURN. CODE FOR SERVICE STABILITRACK AND SERVICE ELECTRONIC STEERING SYSTEM CAME ON DASH. COULD NOT PROPERLY TURN VEHICLE AND ALMOST CROSSED INTO ONCOMING TRAFFIC.