2026 GMC Sierra 1500 problems

Filed Nov 5, 2026 · Engine · OR

See attached document for complaint.

Filed Nov 3, 2026 · Electrical · MN

My radio continues to suddenly reduce volume by approximately 70%. The volume will then come back for a second, then back down again. This can go one for several hours while on a trip, then suddenly back to normal. I have owned this truck for less than 3 months and have about 2500 miles on it. I was informed by a GM Service Technician that this has been an issue that GM is aware of but yet no remedy.

Filed Nov 1, 2026 · Tires · WI

Subject: General Grabber Tire Failure at 13,464 Miles I am reporting a catastrophic General Grabber tire failure on my 2026 GMC Sierra at 13,464 miles\. I am concerned that the failure may involve a defect in materials or workmanship and am requesting that it be recorded and reviewed as a potential safety defect\. The tire is a General Grabber HTS60, size 275/60R20\. Photos of the failed tire are available\. I can provide the tire’s DOT identification number if needed\. After the failure, we contacted a GMC dealership in [XXX], and attended an appointment at Bergstrom in [XXX]\. We received conflicting information from the dealerships and GMC customer service about warranty coverage\. Because I needed a usable vehicle and could not wait for the warranty dispute to be resolved, I purchased a replacement tire from Walmart and my husband installed it\. My safety concern is that this tire suffered a catastrophic failure at only 13,464 miles\. The cause has not been confirmed, and I would like the federal safety agency to assess this report alongside any similar complaints\. Please advise what additional information or documentation would assist your review\. [XXX] Phone: [XXX] Vehicle: 2026 GMC Sierra Mileage at failure: 13,464 Tire: General Grabber HTS60, 275/60R20 INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 23, 2026 · Electrical, Engine · NE

Three different times now (most recent: 10/22/2026), I have had my truck completely shut off when coming to a stop on the highway/interstate. I always have auto start/stop disabled when I drive. When it happens, a message shows on the dash that says press start button. No other codes or check engine light. Thankfully it has started every time, but this is obviously a serious safety concern. After the second time it happened, I had the dealer (Woodhouse Buick GMC Omaha) look at it on 9/14/2026, but they couldn't find anything since there were no codes. I'm not sure if it is an electrical issue or this is related but my audio will stop working at times as well. Nothing from the radio or any blinker sounds. Sometimes it's static with a high pitch noise. 2026 GMC Sierra Elevation 5.3 EcoTec3 v8 10 speed

Filed Oct 22, 2026 · Electrical · 7,329 miles · NC

The contact owns a 2026 GMC Sierra 1500. The contact stated that while the vehicle was stopped, the GPS was not operating as intended. The system failed to update after 15 minutes. The vehicle was difficult to start and had failed to start on another occasion. The vehicle was taken to the local dealer, and an update was forced and the battery was charged. The vehicle was scheduled for a fourth repair. The failure mileage was approximately 7,329.

Filed Oct 21, 2026 · Electrical, Engine · IL

While driving the truck it randomly shuts down, message on dash says shift to park to restart. No check engine light comes on or any other message. When it does this, the truck goes into park. It has been to the dealership 3 times and has not been fixed!

Filed Oct 21, 2026 · Engine · NE

I had driven about 30 minutes on the Interstate at highway speeds and had just exited the Interstate and the truck made a horrible noise, shut off, and the transmission threw itself into park at about 10 mph. At this time, the engine did not want to restart, but did eventually and I had a check engine light on, but I was able to move the truck out of the intersection so that I could be towed to the dealership. Prior to the incident, there were no check engine lights and the vehicle had only been serviced at a GMC dealership. I was very uncomfortable with the way the truck stopped and slammed into park. I am happy that no one was behind me, but it could have been bad. The vehicle has not been inspected yet to my knowledge.

Filed Oct 19, 2026 · Engine · TX

I am writing to formally request that General Motors repurchase my 2026 GMC Sierra 1500, currently with approximately 9,445 miles, due to a serious and unresolved mechanical defect that poses a significant safety risk. Since purchasing this vehicle, I have experienced four separate incidents involving a complete and unexpected loss of engine power, causing the truck to become inoperable. In each instance, the vehicle suddenly lost propulsion and came to a stop without warning. While three of these events occurred while operating the vehicle near my residence, one incident occurred while I was attempting to merge onto a highway. Fortunately, traffic conditions at the time prevented a collision or serious injury. However, the sudden loss of power while entering a highway created an extremely dangerous situation and exposed both myself and other motorists to substantial risk. The vehicle has now been at the selling dealership for nearly one month while technicians attempt to diagnose and repair the issue. To date, I have not been provided with a definitive root cause or a permanent corrective action. The lack of resolution, combined with the recurring nature of the defect, has resulted in a complete loss of confidence in the vehicle's safety and reliability. My concerns are heightened by information suggesting that similar issues may have been experienced by owners of comparable GMC Sierra vehicles. Regardless of the ultimate root cause, the fact remains that my truck has repeatedly exhibited a condition that can unexpectedly disable the vehicle while in motion, creating an unacceptable safety hazard. I purchased this truck with the expectation that it would provide safe, dependable transportation. Unfortunately, after four loss-of-power events and an extended period in the repair facility without a successful resolution, I no longer believe this vehicle can safely fulfill that purpose.

Filed Oct 15, 2026 · Brakes, Engine · TX

On 10/15/2026 I was making a slow right-hand turn up a slight incline into a parking lot when the vehicle braked very hard and the transmission made a grinding noise. I looked at the dashboard, and it was showing that the truck shifted into park while I was driving. The electronic brake engaged as well. I tried putting the truck back into drive, but it would not go into drive. On the dash there was a Service Transmission warning. The push to start engine button still had the green LED on as if the vehicle was running. I pushed the start engine button and the engine started (I didn't realize until now that the engine had shut off). At this point the truck would shift into drive. Another point of note is that I had turned off the Auto Stop feature. I do this every time I start my trip. The truck will be looked at on 10/16/2026 by the dealership. I did report the problem to the service department of the dealership. This incident was the first time it ever happened and there was no warning.

Filed Oct 13, 2026 · Electrical · TX

Since I purchase this truck I've been having no audio twice a week. Dealer has no fix GMC knows they have issues and still they are selling this vehicles. Took a trip to [XXX] a storm was moving in and we had no audio to alert us I also believe with no audio we have no blinkers we almost cause an accident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)