2023 GMC SIERRA 1500 Complaints

Multiple occasions where the dash lights up while driving, the vehicle will slow down to 40 miles per hour while driving and notes on the dash the truck acceleration will be reduced. It has almost caused accidents while I’ve been driving on the interstate. The truck will jerk and shake and jolt. Multiple sensors have been replaced including drive shaft, crank shaft components and cooling valve components. I’ve also been complained about burning smells and my engine started smoking recently which caused my family to evacuate the vehicle. I believe my vehicle has same issues as the other recall on GMC Sierra 2021-2024 with engine issues

We were driving to dinner on March 28, 2025, when our 2023 GMC Sierra truck with just over 22,000 miles started making a clanking sound with major hesitation while trying to accelerate. At highway speeds, the truck lost nearly all power. We made it to the dealership, which was closer than home. Upon pulling in the parking lot, the truck died and we were unable to start it. The truck was actively losing power on the freeway and hesitating, we were fearful it would die on the freeway in 6 pm traffic. On March 29, 2025, we spoke with a service manager who said it sounded like the motor was blown. On April 2nd, Autonation GMC Corpus Christi South confirmed the oil pan was full of metal shavings and they were ordering a new motor. Upon asking for an estimation of how long we would be without our vehicle, the service advisor said he wasn’t taking it out of the bay and we should have it back by April 15. The check engine light did not come on until 1/4 mile from exiting the highway. On April 12, 2025, we texted the service advisor to make sure the truck would be ready on April 15, 2025. He responded that the motor still hadn’t come in and he would let us know when it did. On April 17, 2025, I escalated his from the service advisor to the service manager for Autonation. I was informed the motor had not been ordered, but he would order it and have the motor broken down to meet GM’s requirement. April 24, 2025, motor has been ordered, but no ETA or location of the motor.

While driving the vehicle the vehicle stopped, and engine seized. I could not move the vehicle out of neutral nor restart the vehicle to get out of the road. It was towed to our local dealership's service department on 2/16/25 and has been there since. They are stating the vehicle needs a new engine and the engine is on backorder. OF COURSE! This seems to be an ongoing issue with the 6.2L V8 engine for GMC vehicles.

Had an engine seizure with no warning. The event occurred on 03/22/2025. The vehicle has been in the dealership since then, with no line of sight to a replacement engine. The vehicle had barely over 15k miles. When the engine seized, it went to neutral, there was not power stirring and no breaks. I was fortunate that it was in a residential area, and my speed was below 30 miles an hour when it happened. The dealer is going to replace the motor when they get it, but it sounds like the engine is back ordered, as this exact issue has been happening to multiple vehicles. Like I said, there were no warning lamps, or messages; the engine just stopped working.

GM needs to look at the excessive failures on their Engine Coolant Control Valve on the 3.0 Duramax Diesel engines. Mine failed at under 35K miles and it looks to be weeks or months before a part is available.

While my husband was driving on the NJ Turnpike at 65 mph, his truck just shut off!! . This was very dangerous, he had to try to get over from the left lane, all the way to the shoulder and park the truck. How has this not been taken care of yet? This needs to be looked into, he could have been in an accident. GMC is aware of this problem but has not recalled these trucks. Please make this known to the public, this is very dangerous!! To add insult to injury, we now are told that we have to pay to replace the engine and the truck is less than 2 years old. How is that right? The warranty is out (60k miles warranty) because my husbands drives a lot of highway miles (80k on truck) to and from work so they say it will cost us $9,000 dollars to replace. Since we still have payments on our truck, we have no choice but to get it repaired. Knowing this is an issue and it should be recalled, this is wrong! I am concerned this will happen again, if they replace it with the same engine. Please help!

My 2023 GMC Sierra 1500 AT4X with 25,000 miles equipped with the 6.2L V8 engine, has experienced engine issues and total failure. Dave Sinclair a GM dealer in St. Louis Missouri indicated that bearing failure and lower lifter defects led to engine seizure, engine failure and block damage. This resulting in the need for a new/ replacement engine. I brought my GMC into Dave Sinclair service center on 2-11-2025 due to engine knocking and loss of power, then on [XXX] experienced complete engine failure and total breakdown on [XXX] resulting in traffic risks and issues. No warning lamps or messages. I routinely have the vehicle maintained at Dave Sinclair per their recommend mileage/time. As of 4-18-2025 I've not receive a replacement engine. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving on a mountain highway pulling a light duty trailer coasting downhill, the truck went into Nuetral and lost all power. There was no warning lights or messages prior to failure. The display showed "Unable to shift under current conditions". Luckily I was in the right lane and had enough momentum to be able to coast into a breakdown lane on a slight grade with my trailer. The electronics still worked, but the engine would no longer turn over or shift into gear. Had the vehicle towed to the dealer I bought it from and the tech said the engine will need to be replaced. I was lucky this did not cause a catastrophic failure while driving at highway speeds and was able to bring the vehicle (and trailer) to a stop safely. There is already an open investigation against this problem on the NHTSA website, and the claims look very similar to my experience.

On [XXX] I was traveling at highway speed south on [XXX] . I was driving my 2023 GM [XXX] The truck had 36,199 miles at the time of the incident. The engine is a 6.2 L EcoTec3 V8. While traveling at highway speed, without any warning, the engine shut down. The shift indicator displayed the vehicle being in neutral. When I tried to shift back into gear, a dashboard display stated "The current conditions are not suited for shifting." Fortunately I was able to coast onto the center median, off the traveled protion of the roadway without incident. I contacted the New Jersey State Police. They sent a tow operator to my location, and I was towed to Lester Glenn Buick-GMC in Tom's River, NJ The next day a representative from the service department informed me the vehicle suffered a catastrophic engine failure. The engine completely seized and the vehicle would need a complete engine replacement. The reason for the engine seizure has not been determined as of this time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6) INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Engine failed and it is available for inspection upon request The engine started coasting down a major highway and it put myself and others on the road at risk. The dealer has confirmed that this 6.2 L engine has been giving the dealership problems with these GMCs. The vehicle has only been inspected by the Dealership. The Warning Message stated that I needed to restart the engine; however, you can't do that on a major highway due to pressing the break. The vehicle was already on; however, the engine was not connected. No other symptoms were happening prior to the incident. The engine trouble appears only at this incident.