2024 GMC SIERRA 1500 Complaints

My vehicle has experienced repeated and unresolved electrical system failures and unexpected loss of power steering assist. The problem involves multiple warning lights, module communication faults, drivability issues, and simultaneous malfunctions affecting systems including power steering, traction control, transmission, four-wheel drive, and other electronic controls. Repair records, diagnostic information, and videos documenting the failures are available for inspection upon request. The most serious incident occurred on August 23, 2026, when the power steering failed unexpectedly while I was driving. The sudden loss of steering assist made the vehicle difficult to control and nearly resulted in a collision with an oncoming vehicle. The failure created a significant safety risk because it impaired my ability to safely steer and control the vehicle. The condition has occurred multiple times over several months and has resulted in repeated dealership visits. Repairs have included replacement an HVAC controller, but the failures have continued. The vehicle has been inspected multiple times by an authorized dealer, and the manufacturer has been notified through an open support case. As of the most recent repair visit, no confirmed root cause or permanent repair had been identified, and the dealership was still working with engineering support to diagnose the issue. Prior to and during these failures, numerous warning lamps and service messages appeared, including warnings related to power steering, traction control, transmission, four-wheel drive, trailer brake system, steering column lock, and tire monitoring systems. In some incidents, the vehicle entered reduced-performance mode. These warning messages first appeared in November 2025 and have continued intermittently despite multiple repair attempts. The recurring and unresolved loss of power steering assist while driving creates an ongoing risk of crash or injury.

I purchased a 2024 GMC Sierra 1500 Denali Ultimate equipped with the 6.2L V8 engine on XXX. The vehicle currently has approximately 25,000 miles. On XXX, the vehicle underwent the GM recall repair related to the 6.2L engine at Don Mealey Chevrolet. On XXX, approximately nine months after the recall repair, my family and I were traveling on the [XXX] with my two children inside the vehicle when the engine suddenly experienced a major failure. The vehicle became inoperable while we were traveling on the highway and had to be stopped and subsequently transported to Schumacher Buick GMC in [XXX]. The failure occurred unexpectedly while the vehicle was being operated normally. Having an engine failure while traveling on a major highway with my two children in the vehicle created a significant safety concern because of the potential for loss of power and the danger associated with becoming disabled in active highway traffic. GM has subsequently authorized replacement of the engine under warranty. The vehicle remains at the dealership awaiting completion of the engine replacement. I am reporting this failure because the vehicle had previously received the GM recall remedy for the 6.2L engine issue and subsequently experienced a major engine failure at only approximately 25,000 miles. The failure occurred approximately nine months after the recall repair. I am concerned that the previous recall remedy may not have adequately addressed the underlying condition associated with these 6.2L L87 engines. I am requesting that NHTSA document this failure as part of its investigation into 6.2L L87 engine failures and evaluate whether the existing recall remedy adequately addresses the safety-related engine failure condition. Vehicle information: * [XXX] GMC [XXX] 1500 Denali Ultimate * 6.2L V8 engine INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The vehicle was part of the GM L87 engine recall. The vehicle was taken to the dealership in late 2025 for recall service. The dealership inspected the vehicle for vibration and determined that it required an oil change and updated service manual to require 0W-40 oil. On June 21, 2026 the vehicle experienced an engine failure.

After the initial recall inspection was performed, I was informed that my vehicle was not affected. Subsequently, the vehicle experienced a catastrophic engine failure while traveling westbound on [XXX] near [XXX], approximately one mile from [XXX]. While traveling at highway speed, the vehicle suddenly began losing speed and power. I was positioned between two semi-trucks, creating an extremely dangerous situation. At first, I looked to see if I was traveling uphill because of the unexpected loss of speed. I then pressed the accelerator in an attempt to maintain highway speed. The vehicle abruptly downshifted and the engine RPM increased dramatically. Immediately afterward, warnings appeared on the instrument cluster, including “Engine Oil Temperature High” and instructions to pull over and allow the vehicle to cool down. The vehicle continued to lose power, creating a serious risk of collision due to the surrounding highway traffic. The vehicle was subsequently towed to Findlay GMC, where it was inspected and diagnosed with a failed engine. The engine was ultimately replaced. This failure occurred after the vehicle had been inspected under the recall and I had been advised that it was not affected. I am concerned that my vehicle may have been incorrectly excluded from the recall or that the recall does not adequately identify all affected vehicles. The sudden loss of propulsion at highway speed presented a significant safety risk and warrants further investigation. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Engine stopped working while driving 65 mph on I435 Kansas City. Engine failure had to pull over in 3 lane traffic to get off of roadway. Engine just stopped working. Had towed to GM dealer who performed full engine replacement. 6.2 L . No warning. Just stopped working. Safety traveling on 3 land highway engine stopped with no warning had to work way over the shoulder with no engine.

I received a notice months ago for possible engine problems. my dealer checked it out and everything was good except for changing oil from 0W-20 to 0W-40. i was in Atlanta, GA on 8/26 and by the time i got home on 8/27, engine was knocking. I barely made it home. the dealer has had the truck since. they said i have to have a new engine. no idea when they will get one inn or when i will get my truck back. i opened a claim with GM (Case #108927907). GM basically offered no assistance, help, etc. i even tried to trade the truck back to my local GM dealership for another truck and they wouldn't offer enough on trade inn (says they wouldn't be able to sell it), GM Corporate wouldn't offer buy back, loyalty program money, etc. as they claim it's under a recall. I have never received anything about a recall for the engine. local Ford or Toyota dealerships will not even consider taking it in on a trade after new engine, says they cannot sell because of engine issue with 6.2L engine. so i'm stuck with a truck that i cannot sell or trade and is now worthless. I'm sure the new engine will fail as well.

My vehicle is under the L87 Recall from GM for engine failure. In September 2025 it was given the recall “fix”, different thicker oil. But on July 1 2026, my engine seized while I was driving 60 mph on the highway. GM has since replaced the entire engine and the radiator. But the “fix” obviously did not work.

On 8/31/2026 at approximately 2330 hours I was driving my 6.2L Sierra home. I took a left hand turn and the engine stopped. This happened with zero warning. I attempted to restart the engine after coming to a stop and the starter clicked once and nothing happened. Had it towed to my dealership for service. I was told the engine seized and will need to be replaced. I went through the recall process earlier where I was told my engine passed inspection and the oil was replaced with heavier weight oil and I was told it was good to go.

10/01/25: Vehicle brought to dealership for the 6.2L Engine Loss of Propulsion Recall. Engine Passed the Pico vibration test. Oil was changed from 0W-20 to 0W-40. Mileage was 29K. 06/17/26: Engine Seized at 43K miles. Was travelling 50 MPH up a Mtn Pass. Barely had enough momentum to roll to the right shoulder out of traffic. 07/07/26: New motor installed. Back to 0W/20 oil. Since ownership, I have to on a regular basis reset the Collison Warning from Seat Vibration to Beeps. It appears to reset back from Beeps to Seat Vibration every time there is an over the air software update. It might even just randomly reset. I cant tell for sure. I recently had a small backing accident were I was expecting the Beeps to alert me. I mentioned this to my auto insurance company. They told me this was not the first time they have heard of this type of situation.

On 06/26/26, I was driving my 2024 GMC Sierra 1500 AT4 with 6.2 engine (Aug. 2024 engine build date) with 27,614 miles down the highway at 60-65mph and my RPMs started jumping and I lost engine power and received this P0016 error message. I was able to coast off the highway at the next exit but this put me and my family at risk. Once I was able to coast into a parking lot, my truck wouldn't start anymore. My dealer picked up my truck and the engine was on backorder and then was replaced and I got the truck back on 08/21/26.