GMC Complaints

The contact owns a 2019 GMC Sierra 1500. The contact stated while driving approximately 20 MPH, the vehicle came to a screeching stop. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was diagnosed that the electronic brake control module had short-circuited and there was a miscommunication, which engaged the parking brake and locked up the rear wheels. The vehicle was not repaired. The vehicle was previously taken to the same dealer on two occasions and repaired under NHTSA Campaign Number: 19V889000 (SERVICE BRAKES, HYDRAULIC, SERVICE BRAKES, ELECTRONIC STABILITY CONTROL (ESC); however, the failure recurred. The manufacturer was contacted and opened a case, but no additional assistance was provided. The failure mileage was approximately 7,000.

I CONSTANTLY GET THE FRONTAL CRASH NOT AVAILABLE WARNING THE NAVIGATION PICKS UP ON CONVERSATIONS STEREO FREEZES NAVIGATION SCREEN HAS BEEN BLANK NO MAP DATA VISIBLE SCREEN WILL NOT CHANGE FROM DAYLIGHT TO NIGHTIME ANYMORE (I HAVE TAKEN THE VEHICLE TWICE TO THE DEALERSHIP AND HAVE IT REPAIRED THEN IT HAPPENS AGAIN) WHEN DRIVING THE VEHICLE WILL RANDOMLY BRAKE AND SAYS SOMETHING IS NEAR WHEN THERE IS NOTHING CLOSE

The contact owns a 2022 GMC Sierra 1500. The contact stated that while accelerating to 70 MPH to overtake a dump truck, the vehicle lost automotive power and stalled. During the failure, the message "Transmission in Neutral" was displayed and the vehicle coasted to the side of the road. The contact stated that the vehicle failed to restart and was towed to the local dealer to be diagnosed. The contact was informed that the engine was faulty and needed to be replaced along with the oil delivery system. The vehicle was not yet repaired. The contact was informed of NHTSA Action Number: PE25001; and indicated that the vehicle had experienced the failure listed in the investigation. The failure mileage was 20,016.

Shift to park. Vehicle does not turn off when in park. This recall is in effect on other 2017 Acadias but for some reason ours is not under the recall. Had this issue in 2020 and it was repaired at our cost. It is now doing the same thing.

024 GMC Sierra 2500 Denali Ultimate, which has suffered: •Five catastrophic engine failures at highway speeds. •Total brake failure, leaving the truck unable to stop. •Severe electrical malfunctions, including flickering headlights at night. •Retaliatory actions from General Motors after I refused to waive my legal rights. I have documented proof, including GM’s own service records, emails, and a 7-minute recorded statement from GM’s highest-level technician, confirming that GM installed the wrong computer module (1500 series instead of the required 2500 series) in my truck. Additionally, I have evidence that GM executives instructed technicians to conduct diagnostics, take apart the engine, and reassemble it—but NOT repair the defect—after I refused to sign an affidavit waiving my rights. Due to these failures, I suffered a dislocated shoulder in one of the incidents, and my [XXX] daughter remains traumatized to this day. Given the immediate danger this defect poses to other GMC Sierra 2500 owners, I respectfully request that NHTSA open an investigation and consider issuing a recall before a tragedy occurs. 1. Engine Failures Since 3,000 Miles – GM’s Own Work Orders Confirm Issue Since purchasing my 2024 GMC Sierra 2500 Denali Ultimate, I have experienced five catastrophic engine failures, all occurring while traveling at highway speeds (70 mph): •The truck suddenly lost power, dropping from 70 mph to 5-10 mph within seconds. •This created an immediate risk of being rear-ended or losing control on the highway. •GM’s own service records confirm that my engine issues began at just 3,000 miles. •GM dealerships misdiagnosed the issue FOUR TIMES, returning my truck to me in an unsafe condition. •The real cause was only identified after the FIFTH failure, when a GM-certified head technician finally determined that GM had installed the wrong computer module (1500 series instead of 2500 series). This means that for months, GM knew my vehicle w INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

Brake vacuum pump failed causing engine damage. Camshaft on national back order. Vehicle has been in repair shop for 1.5 months waiting on part. No ETA. There has been recall for similar vehicles with same issue, failure, damage. But not for this VIN. It’s the same failure with same damage. How is this not a recall for this VIN?

While driving at 65 mph on a freeway, the engine failed and cracked a rod with fresh oil and all maintenance done regularly. Truck brakes would not work after engine failure. Truck was fully disabled and I was stranded on freeway @ 90,000 miles. Lights on exterior of the vehicle were dim after engine failed

Shift to park. Dash stating shift to park when vehicle has been put in park. Unable to turn vehicle completely off.

Car shut off while driving down the interstate at 70 MPH. Barely got to side of road. Two children were in the vehicle. The safely of all in the vehicle were at risk. Car would not restart. Had to be towed. GMC dealer told me the motor needs to be replaced. It is the 6.2L.

This morning, while driving to work, my truck was operating smoothly without any prior warning signs. Suddenly, the dashboard displayed a message indicating "Low Oil Pressure" and instructed me to turn off the vehicle. There were no preceding alerts, such as check engine lights or low oil pressure indicators. As I was preparing to follow the instructions, the vehicle dashboard displayed another message directing me to put the truck in neutral, and then the engine automatically shut off. Unfortunately, after this occurred, I was unable to restart the truck.