2019 GMC SIERRA 1500 Complaints

Transmission problem I have had 3 transmission replacement. I was told that these trucks have a faulty transmission from the sales representative to the mechanics. After these transmission replacement now I have an engine problem where the lifters need to be replaced and camshaft. I have had all service done on time never missed a service. Now the dealership is telling me that this could be a reason why my transmission keeps going out. And can’t really give me a reason why I keep having the same problem. Truck has 97k miles on it when I purchased it had 45k I can’t even enjoy the vehicle because it’s always at the dealership with the same problem and they don’t know why it’s keeps happening, at this point it is a safety concern for me this is my daily driver where I drive my kids to school now I never know when it will just stop running. It jerks I’m afraid when I’m stop at a stop sign I might hit the car I front of me.

It is the same issue with 2021-2024 6.2L engines that have already been recalled. I have to replace lifters and cam because of the issue.

The original engine (6.2L L87) had to be rebuilt by GM because of lower engine knocking in June 2024, with 57,873 miles. The rebuilt engine had to be replaced with a remanufactured engine in October 2024, but had to wait until the completed work in December 2024. The remanufactured engine started knocking, and that engine was replaced in October 2025. All part of the L87 6.2L engine failures. Problem documented by dealerships. Components were brought to GM's attention. No warning lights or messages - just lower engine knock.

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, several unknown warning lights illuminated, and the engine seized. The vehicle was taken to an independent mechanic, where it was diagnosed with a misfire in cylinder #3 and engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The contact referenced an unknown recall with a similar failure; however, the VIN was not associated. The manufacturer was not made aware of the failure. The failure mileage was approximately 101,000.

Driving at night when the low oil light came on then engine failed. Engine is now blown and will not run. Engine L87.

My truck had a ticking, knocking on the bottom end of the engine as I was driving home with my children. When i pulled into my driveway, the low oil pressure light came on and the truck began to stall while the back of the truck was till in the roadway. Several cars had to come to a complete stop to avoid hitting us, right where my children were seated in the back. I was able to limp the truck into my driveway. The following day I attempted to start the truck. It started hard and immediately gave me a low oil pressure light. I shut the truck off and called the dealership. The dealer wanted $3000 to just diagnose the problem. I had to pay out of pocket to get the truck towed to a private shop. The private shop started the truck and attempted to drive it to reproduce the issue. The truck engine seized and I had to pay to have it towed back to the shop. I then had to purchase a brand new crate engine from GM and pay to have it installed. The seized engine would not even roll over, so the cost of labor was increased due to them not being able to unbolt the torque converter on the engine. My engine is a 6.2l and GM told me based on by truck being a 2019, that it was not included in the recall. So far, the engine replacement has cost me $19,000.

Transmission experiences shuddering while accelerating. Impact on driving performance which is a safety issue. Problem has been confirmed by the dealer. No warning lights are present during this problem.

Was driving at about 55 mph and vehicle popped up with warning and said shift into neutral to restart. I tried to and all power turned off. This was at around 8 p.m. so no headlights or anything. Luckily got it stopped without hitting anything. Had vehicle towed and motor was locked up. Spun bearing they said. Same issue apparently as other 6.2 liter engines have been having.

Without any notice, I lost my power steering while driving. The wheel jerked to the side, and when I corrected I realized that I no longer had power steering. I was still able to "steer" my vehicle, but not without brute force. If it were someone of lesser ability (e.g. elderly) it may have led to a devastating outcome. I have yet to get the issue diagnosed, as it just happened yesterday, but it certainly is concerning! I just wanted to bring this to the attention of the NHTSA, as I've since learned that I'm not the first GM Sierra owner to suffer this malfunction.

Engine suddenly lost power at highway speed. Truck was still running so I was able to get off the highway. Engine failure was caused by bent lifter. Lifter failure also caused damage to the camshaft. Vehicle was at dealership for significant time with a large repair bill that GM is not willing to cover due to the vehicle being 5 weeks out of warranty