GMC Complaints

The power steering and Stabilitrak systems intermittently fail while the vehicle is in operation. The issue occurs unpredictably, both immediately after startup and while driving. On several occasions, the systems have failed during turns, requiring sudden corrective action and increased steering effort to maintain control and avoid veering off the road or colliding with nearby vehicles. No warning signs or noticeable symptoms are present prior to the failure occurring.

I am submitting this complaint regarding ongoing mechanical and electrical issues with my 2021 GMC ACADIA that have been occurring intermittently for approximately the past year and a half. The primary issues involve the coolant temperature sensor, thermostat system, engine cooling fan, and dashboard warning messages. The vehicle repeatedly experiences problems related to the coolant temperature sensor and thermostat. During these episodes, the engine cooling fan continues running even after the vehicle has been turned off, sometimes for an extended period of time. In addition, the dashboard frequently displays the warning message: “Steering Assist is Reduced – Drive With Care.” These warning messages and symptoms occur off and on without consistent resolution. The vehicle has already undergone repairs, including replacement of the radiator, yet the problems continue to return. Despite previous service attempts, the underlying issue has not been permanently corrected. The recurring nature of these problems raises concerns about the reliability, safety, and dependability of the vehicle, especially considering the steering assist warning and possible overheating or electrical system concerns connected to the cooling system malfunction. The repeated failures have caused significant inconvenience, concern for safe operation of the vehicle, loss of confidence in the vehicle’s reliability, and ongoing disruption due to repeated repair needs. I am requesting a thorough diagnosis and permanent repair of the coolant temperature sensor, thermostat, cooling fan system, and any related electrical or control module issues contributing to these recurring problems.

Car reduced speed and the smell of gas filled the car. Car shut off. Check engine light came on with reduced speed. This is the second time this has happened. Gas leaked onto ground from car. Car stalls immediately while driving and does not allow you to press the gas to keep moving. Almost hit from behind on Main Street.

Car reduced speed and smells of gas. Will not crank and will stall immediately and just stops immediately. Car has only 30,000 miles and it has stalled out for the second time with the same issue. The first time the car stalled on the freeway and I was almost hit from the back. This second time reduced speed and quickly shut off on a Main Street and was almost hit again. Car does not allow you to press the gas and coast during the incident.

The vehicle has experienced recurring suspension, drivability, and pulling issues associated with the 4-corner air ride leveling suspension system since early ownership. The first major incident occurred at approximately 4,600 miles when the vehicle displayed suspension warnings and would not accelerate properly past highway speeds. Since that time, the vehicle has repeatedly experienced pulling during acceleration, unstable ride behavior, suspension/leveling concerns, alignment-related issues, and drivability instability. The problem has been reproduced multiple times and documented through approximately 16 repair visits and roughly 74 cumulative days out of service. Dealership service records include repeated suspension inspections, drivability evaluations, wheel alignments, and related repair attempts. The issue remains unresolved and the vehicle is currently back in service again for the same concern. The recurring pulling and instability create safety concerns because the vehicle does not consistently track properly during acceleration and normal driving conditions. Suspension warning messages and drivability symptoms first appeared early in ownership while the vehicle was still under factory warranty. I have also found many similar owner complaints online involving the same suspension system in comparable GM full-size SUV models.

Brake module malfunction Codes: “service ESC” “break assist failure. Press hard to break. Speed limited”

I passed the recall inspection on 12/17/2025 and the higher viscosity oil was put into my vehicle. On 12/25/2025 my vehicle's engine shut off while I was traveling on the highway (I-25). The vehicle went into to neutral and I had to pull over to the side of the highway without power. The vehicle started again and as I was merging onto the highway it shut down again. The truck started again and I was able to drive it home. There were no codes found when I took it in for service on 12/26/2025. On 01/24/2026 I was driving on the highway (US-40) and I had complete engine failure. I had to get my vehicle towed to the service center and a new motor was installed. On March 27th the vehicle's engine shut off again while driving on the highway (US-191). There were no codes or check engine lights on this time either. The service records state that the starter mount stud was loose.

The contact owns a 2022 GMC Sierra LD Crew SLT. The contact stated that the vehicle's front driver side and passenger side doors do not lock when depressing the key fob and while inside the vehicle. The dealer was contacted; however the vehicle was not diagnosed or repaired. The manufacturer was not notified of the issue. The approximate failure mileage was 68,000.

The 2019 vehicle experienced a significant engine failure consistent with widely reported issues involving GM 6.2L V8 engines in GMC Sierra and Chevrolet Silverado platforms. Prior to failure, the vehicle developed abnormal engine noise including ticking/knocking sounds, followed by loss of engine performance and mechanical failure. Vehicle diagnosis indicated internal engine damage requiring major repair or full engine replacement. The failure occurred despite normal maintenance and relatively low mileage for a modern full-size truck. The vehicle had no prior abuse, modification, or racing use. Based on technician feedback from December 2025 service call and publicly reported incidents, the failure appears consistent with commonly reported GM 6.2L issues involving: connecting rod bearing failure crankshaft/bottom-end damage lifter or valvetrain failure internal metal contamination sudden engine seizure or loss of propulsion This issue presents a serious safety concern because sudden engine failure can occur during normal roadway operation, potentially resulting in: sudden loss of power inability to accelerate vehicle shutdown while driving increased crash risk in traffic conditions I am aware of numerous similar complaints involving GM 6.2L V8 engines across multiple model years, including investigations and recalls affecting related vehicles and powertrains. My vehicle appears to exhibit the same or substantially similar failure characteristics. I request that NHTSA continue investigation into 2019 model-year GMC Sierra 6.2L engine failures and evaluate whether these earlier vehicles should be included in broader recall or warranty coverage.

I have had an incident where my 2023 gmc 3500 hd was had left me stranded earler this week. i towed the new truck to a certified dealer and i haven't heard anything since then. they mentioned my transmission will need to be fully replaced because valve body issues of solenoid a,e,f, are stuck open and closed codes on the 10 speed transmission upon researching my trucks history it was manufactured in 2022 and pulled out for sale october 2022 and i have seen. 242454441 special recall the same issues i experienced shudder and engine power reduced and no parking gear or driving. i need help and didnt have any warning of anything about this till now since it was showing my vehicle only had a tailgate issue which gmc didnt help me out when i had to pay for my taillight after firewood flew out with the tailgate opening in jan 2023 they said it wasnt a known issue then fixed the tailgate but not the taillight so i need help proving my truck belongs with the 242454441 class of recalls because not only does the transmission the exact same as previous models obviously 1000s of others are getting this issue thank you