GMC Complaints

My vehicle started shaking & stalling really badly out of nowhere on April 18, 2025. Had to have it towed to GMC dealership. They said the engine was showing low compression. Got timely oil changes and everything on this engine. The check engine light nor any other warning light ever came on when this happened. After some research, the engine in my car, the 2.4 L engine on the 2014 - 2017 models of the GMC Terrain has known defects which although GMC has known about, they have done nothing to address the issue. There was no prior warning that the engine was failing. It was very sudden and I was in traffic when this happened putting both my safety and the safety of other drivers and pedestrians in danger.

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly downshifted. There was no warning light illuminated. The vehicle was able to restart. The vehicle was taken to the dealer, where it was diagnosed and determined that the transmission had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 70,000.

When dealer took apart my rear brakes the parking brake shoe lining was un bonded from the shoe 26,000 miles and seems to be a defective part

The contact owns a 2021 GMC Yukon. The contact stated that while his wife was driving at 55 MPH with two child passengers, the vehicle went into LIMP Mode. The driver was able to pull over safely to the side of the road. The contact stated that the check engine warning light was illuminated. The vehicle was taken to the local dealer where it was diagnosed and determined that the crankshaft fractured, causing metal shards to enter the engine. The vehicle was not repaired. The dealer recommended that the engine be replaced. The manufacturer was contacted and referred the contact to the dealer and to the NHTSA Hotline. The failure mileage was approximately 94,558.

The contact owns a 2015 GMC Yukon. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently lost motive power. The contact was able to pull to the shoulder of the roadway, where the vehicle failed to restart. No warning lights were illuminated. The vehicle was towed to an independent mechanic, who diagnosed a failure with compression in cylinder 7, resulting in damages to the engine. The contact was informed that the engine needed to be replaced. The vehicle was repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling), but the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 100,000.

Engine misfire, bringing vehicle to low speed. Safety was a main concern, while I was on a highway and could not maintain a flowable speed with other vehicles. The problem was confirmed by the dealer on 4/25/25 milage 77681, repaired. Then happen again on 5/9/15 milage 79091, repaired and confirmed again by a different dealer. There were no pre-warnings, once it happen all warnings went on.

My IntelliBeam function stops working sometimes, I can still use the lights as normal but the IntelliBeam function stops every so often and starts working after about 2 to 10 mins. Lane departure warning stops every so often and will start working after 1 to 10 mins, I have noticed that when it stops working at night time then the IntelliBeam function stops working also. When I press the on/off button for lane departure then it will say that lane departure is unavailable right now. I have been getting a p20ee code showing something is wrong with SCR nox sensor 2. Scan tool reveals that the sensor works normal and then stops. Once I clear the code then it works good for a few days.

I was headed out of town and stopped in the neighborhood at a stop sign. As usual, the Auto Stop/Auto Start feature turned the engine off and when I lifted my foot off the brake pedal to reengage the engine, the truck started rolling backward. The engine would not start even though all the gauges and systems were working as if the engine was on. I had the truck towed to my mechanic and after troubleshooting, they determined the engine was locked up and would need to be totally replaced. My truck has the 6.2L gas engine and have since learned that GMC is recalling later model trucks with this engine in them due to engine failure. If my engine failure had happened anywhere other than at a stop sign in a neighborhood, it could have caused a significant accident. I can't find a new engine because of the GMC recall and the cost to replace the engine with a lower mileage, used engine is approximately $16,500.

Transmission issues 5/5/2025, bearly 15,000 miles on it, was excelerating from a stop heading down hill when rear tires locked up, engine downshifted, engine light and limp mode flashed across my screen. threw it into nutral and coasted to next signal and pulled into gas station back parking lot. No codes pulled. called dealer to share and they knew exactly what was wrong with transmition value body problem. but is my transmission ok? Towed to dealer, no fix in sight. 7th vehicle at dealer with same problem. Others been there for months waiting on same part. Thank God I wasn't towing anything, but now I have to pay for rental and they say they are waiting on parts??

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed and slowing down to stop, the vehicle suddenly shut off and failed to restart. The vehicle was eventually towed to the residence. The cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The local dealer was not yet contacted. The contact was informed of the NHTSA Action Number: PE25001 (ENGINE, ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the NHTSA Action Number. The failure mileage was 115,000.