GMC Sierra Complaints

15,732 consumer complaints on file.

#11732638April 21, 2026
ENGINE
I am reporting two separate stall/loss of propulsion events on my 2022 GMC Sierra 1500 Denali Limited (VIN: [XXX] ), which is subject to NHTSA Recall #25V274000 and GM Special Coverage XXX (L87 Engine Loss of Propulsion). INCIDENT 1 — April 16, 2026: While decelerating off a highway exit ramp, the vehicle stalled without warning. The dashboard prompted me to shift to neutral and restart. I performed a rolling restart successfully and continued driving. This stall occurred while decelerating on a highway exit ramp with vehicles traveling at highway speeds behind me. The sudden and unexpected loss of propulsion created a significant rear-end collision risk. INCIDENT 2 — April 17, 2026 (next day): While traveling at approximately 40 MPH and climbing a hill under load, the vehicle stalled a second time. The dashboard again prompted a neutral restart. This time the vehicle would not restart. All I heard was a single click from the starter, followed by a complete dash reboot. The vehicle lost all power repeatedly upon restart attempts. I was stranded on a narrow, high-speed rural road in Standish, Maine during rush hour, with vehicles passing at speed. I was in serious danger. The vehicle was towed to Weirs GMC in Arundel, Maine (the selling dealer), where it currently remains for diagnosis under RO# XXX. Both stall concerns are documented as Warranty Pay. Additional concern: Since the day after purchase (March 28, 2026), I have noticed a pronounced cold-start tick originating from the bottom end of the engine, confirmed by an independent mechanic as coming from inside the engine. This vehicle passed a Recall #25V274000 inspection on December 28, 2025 at 98,233 miles. The tick and stall events began after that inspection. I am requesting this be formally documented as a safety complaint tied to Recall #25V274000 and Special Coverage XXX. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732667April 21, 2026
UNKNOWN OR OTHER
I did not receive an owners manual when my vehicle was purchased new on January 15 2025. I reported it to the dealership and to GMC both times they said too bad, access it online. I contacted GMC again after recall N252540430 was issued but they still refuse to provide an owners manual because 2025 Sierra 1500 isn't listed it's only the 26 model year.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732844April 21, 2026
UNKNOWN OR OTHER
Engine coolant control valve
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732853April 21, 2026
ENGINE
I was driving and lost engine power in the left lane of a freeway, cut across traffic and coasted to the shoulder. Had truck 6' off of road, though with semis and cars passing at 70mph, I left and waited in the ditch for the tow truck. The electronics worked, but the engine was dead and would not start. When the tow truck arrived, the wheels were locked up and they used rollers to haul the truck to the dealership. After the dealer inspected the truck, they sent a message saying they could not turn the engine over by hand. The engine had metal shavings in the oil filter and after removing a valve cover, found metal contamination circulated throughout the engine. The engine, radiator, oil cooler lone, and battery junction box all require replacement. This truck has a 6.2L L87 engine, and the dealer has had several other vehicles with the same blown engine failure. The truck was in for the recall on this issue about a month before the engine went out, they placed a pico scope in the engine to check the drive shaft, and then added a heavier oil. No warning lights came on until the engine died.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732880April 21, 2026
ENGINE, POWER TRAIN
After owning this truck a little over a year I’ve had to replace the transmission and now it’s in the because the motor sounds like a bag of marbles was put in it and the warranty company is a joke they only want to replace just the cam and lifters but yet the dealership hasn’t be authorized to go to the bottom of the motor to check it out this truck has been nothing but a lemon!!!!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732292April 20, 2026
POWER TRAIN, ENGINE
I bought the truck brand new from Gregg Young in Atlantic, IA. While an hour into the drive home, the truck began shuttering as if the transmission was having problems finding the gear. I immediately made an appt with their parent dealership of Gregg Young in Plattsmouth, NE. They had the truck for a week and couldn’t duplicate the transmission issues after I reported several occurrences and symptoms, they also didn’t provide a service invoice of the work performed while I found was unusual. As I was driving the truck home from repairs it started hesitating and having difficulty finding gears. I didn’t think much of it since the dealer claimed there was nothing wrong. This past weekend while going 65 mph down the freeway the transmission started shuttering as well as the truck and the tires began to lock up to the point of almost losing control, there was also metal on metal noises. I had to pull over and luckily driving real slow I made it home. The Gregg Young dealership were I bought it will take no responsibility and provided falsification since no service was provided nor upon checking app gps there was no indications it left the dealership while in there possession for a week, will contact GMC in the AM since this has now become a safety issue and there was metal on metal contact noises and the serious risk of a crash.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732418April 20, 2026
ENGINE
I bought a brand-new GMC 1500 6.2L AT4 back in 2025. Never have an engine recall. At 39K miles, lost power, and ended up replacing the camshaft and lifters. 2K miles later went back to the dealer for engine replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732442April 20, 2026
ENGINE
Active Fuel Management Miss firing Idle rough Shaking Loss of power #7 cylinder loss of all compression Bad fuel mileage Skipping
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732548April 20, 2026
ENGINE, UNKNOWN OR OTHER
Coolant control valve failing. Warranty not covering this part. Seems to be a manufactured issue. Happening on a lot of 2021 GMNC Sierras with the 3.0l Duramax.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732188April 19, 2026
POWER TRAIN
Engine seized
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732205April 19, 2026
ENGINE
I drive this vehicle on higher speed roads to work everyday. Roads also used by large tractor trailers and like larger vehicles. I was told by dealer that I had broken exhaust manifold studs at a previous oil change. While driving the truck it seemed to lose power for a short time but I was in traffic and assumed the loss of power at that time was related to a possible exhaust leak.I scheduled a appointment to have the repairs addressed. When I picked up the vehicle I was told that there was a ticking noise in the top of the motor. They stated it was the lifters and needed to be repaired for $7136 dollars. I researched the problem and found out how big of an issue this is specifically for the owners of the 6.2l (L86) engine. Highly concerned I schedule the repair and dropped the vehicle off. Shortly after the dealer called and stated the vehicle had bent push rod collapsed lifters damage to the cylinder head, camshaft and worn camshaft bearings now cost are $14350 or replace engine for $17000. I chose to replace top end. The next day I was called back and was told the bearing on the cam journals were down to brass and I would need new engine. Cost in just 24 hours not are $22000. This vehicle was maintained by this dealer also for all fluid changes. The belief is all the failures were related to the active fuel management system. (going from 8 to 4 cylinders ).
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732209April 19, 2026
SERVICE BRAKES
The electronic part of the truck gave a warning and shut off my trailer brake system while towing a 21K 5th wheel trailer (X2). The truck is available for inspection. Any part of the electronics package that has the ability to disable a trailer braking system while towing needs to be removed/disabled immediately. The truck has not been seen by a dealer yet. yes there was a warning I briefly saw both times, but I can't say what it said.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732214April 19, 2026
ENGINE
After completion of recall repair, changing oil weight from 0w20 to 0w40, I encountered loud squealing and knocking sounds from the engine bay. As catastrophic failure has been reported the vehicle was immediately taken to the closest GM dealership, Southern Chevrolet of Chesapeake, VA.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732220April 19, 2026
ENGINE
2022 GMC Sierra Denali 6.2 L Engine failure at 32,000 miles/924 Hours on 9/2024. Was driving truck dashboard lit up, popped into neutral entering a main road. Thankfully my son wasn’t hit by oncoming traffic. Vehicle would not start called Police, tow truck and was found to be total catastrophic engine failure. New engine was replaced. New engine has roughly 22,000 trouble free miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732252April 19, 2026
UNKNOWN OR OTHER
Safety Complaint – Delayed Acceleration from Automatic Engine Stop/Start I am reporting a safety concern regarding the automatic engine stop/start system in my GMC truck. During normal operation, the system shuts the engine off when the vehicle comes to a complete stop. When I release the brake and press the accelerator, there is a noticeable delay while the engine restarts before power is delivered to the wheels. This creates a hesitation between driver input and vehicle response. This delay presents a safety concern because it affects my ability to react quickly in situations that require immediate acceleration. I have experienced multiple real-world scenarios where this hesitation impacts safe operation: While stopped at an intersection preparing to turn, I observed oncoming traffic approaching faster than expected. When I attempted to accelerate to complete the turn, the delay caused by the engine restart reduced my ability to clear the intersection promptly. In stop-and-go traffic, I needed to move forward quickly to maintain safe spacing or respond to changing traffic conditions. The hesitation before acceleration limited my ability to react immediately. When pulling into traffic from a parking lot or side street, heavy traffic often creates small gaps that require prompt acceleration. Due to the delay in engine restart, it is difficult to accurately gauge and anticipate the truck’s response when pressing the accelerator. With this hesitation, safely merging into traffic in these conditions becomes extremely difficult and, at times, effectively impossible. In situations where a vehicle encroaches into my lane or a hazard develops unexpectedly, the delayed throttle response reduces my ability to maneuver out of the way quickly. This is not simply a convenience issue. The system introduces a delay between driver input and vehicle response, which can reduce reaction time in situations where immediate acceleration is necessary to avoid a potential hazard.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732008April 18, 2026
UNKNOWN OR OTHER
OnStar module failed. Unable to fix and needs replaced. Thousands of other individuals having same issue. Car can shutdown without warning while driving. This issue must be addressed by GM.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732074April 18, 2026
ENGINE, ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
I brought this truck brand new. Had issues the first couple days of purchase that was a quick fix, but as time went on things got worse. Truck always stalling out, engine has been replaced once already due to a recall and months after the first replacement, it stalled out on me again in the middle of the freeway and I just got a call from the dealership that it needs another new engine! How is this right! How is this safe! I could've lost my life on every occasion it has happened.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732122April 18, 2026
ELECTRICAL SYSTEM, ENGINE, FORWARD COLLISION AVOIDANCE: WARNINGS
My GMC sierra with 40000 miles The check engine light turn on and was steady on when driving on the highway I loose a power on the vehicle for a few seconds and almost a semi truck behind me hit me because I don’t have any power on the vehicle, I stop on a safe place and try to start the vehicle again immediately call dealer for appointment an start drive to home. The lady on General Motors say I can drive safe with my vehicle but I don’t feel safe because nothing on the onstar computer works the emergency button and GPS it’s not working at all.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732123April 18, 2026
ENGINE
My L87 engine has failed due to a manufacturing issue. The recall number for this issue is N252494000. Upon contacting GMC, they state that my VIN number is not included in this recall despite having the same exact issues. I took the vehicle into a mechanic as soon as a problem had arose.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11732142April 18, 2026
UNKNOWN OR OTHER
I took my truck in for routine maintenance. When i got it back and turn the truck on, the instrument cluster was completely black. I couldn't get it to turn on. I went back into the dealer and informed them of the issue. The claimed they had not done anything electrical The dealer has told me that they are not sure why it has stopped working but they did let me know they had to replace several instrument clusters with other customers. I am unsure if they had paid for the replacement or not. I've looked online as well and seen multiple GMC truck owners having the same issue and getting their instrument clusters replaced as well. I've noticed this is happening with 2022 models and above. Please look into. Thank you
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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