GMC Sierra Complaints

15,732 consumer complaints on file.

#11756257August 11, 2026
SERVICE BRAKES, ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
June 29, 2025, Driving on the St. Francis loop in Amarillo, TX, brake lights start flashing, the warning sounds happening, no brakes. I had already slowed down to 35-45 mph due to road construction ahead. I weaved through the cones and as soon as possible, hit the ditch and then coasted to a stop. (I didn’t think about the emergency brake, in my panic.) I turned the vehicle off and called my husband. I decided that I wasn’t pulled over far enough over in the ditch, so I started the pickup again. The lights and warning signals for the brakes were gone and when I pressed on the brake pedal, there were brakes again. I drove home at 35 mph, knowing I could use the emergency brake at that speed, if needed, and had brakes all the way home. GMC Bender repaired truck. After driving approximately 3 miles since repaired, our daughter took the truck to Grease Monkey. She was at the garage door; employee said the pickup didn't need an oil change. She backed out and didn’t have brakes (no warning lights or sounds) and as the truck continued backing, it hit the Grease Monkey sign at the east end of their lot and broke it, knocked the sign over. An employee walked over to see what happened, she told him that she didn’t have brakes. He sat in the pickup seat and pushed on the brakes and said, yes, you don’t have brakes! The police were called, and the officer who showed up took pictures, gave us his card, talked with my husband and talked to the Grease Monkey boss. August 6, 2025, I called GMC Bender Service Department (11 mins. 8 secs.) I told them what had happened. They sent a tow truck to bring the pickup back to their shop. September 16, 2025, my husband texted me saying GMC Bender said that the pickup shows another EBS Modulator Fault. No new parts… used one would be $1293 installed. A week to get it here, no guarantees. There's more details, but the vehicle cannot be repaired to guarantee brakes will work properly. Please help us know what to do next.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756301August 11, 2026
ENGINE
I was driving doing about 60 mph. All of a sudden the engine stopped and the truck just coasted. I was able to find a safe spot on the side of the road and pull over. Called a tow truck and had it taken to the GM dealership nearby. The trucks engine was just fixed in October of 2025 for the camshaft and lifter rods. It’s currently in the shop and I’m waiting for the diagnostics.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756351August 11, 2026
ELECTRICAL SYSTEM, SERVICE BRAKES
ABS Randomly turns on with the traction control light… All windows except for driver window will not go down and sometimes it does not unlock or lock sometimes. It started the beginning of 2022 and has got worst over the years. It is available for inspection. Safety has been and issue because whenever it rains it can lose control on the road haven’t had the money to fix it so don’t really drive it right now.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756357August 11, 2026
ENGINE
On [XXX] I was driving my 2024 GMC Sierra 1500 Vin # [XXX] on a major highway in Houston when without warning the engine shut off, stranding me in the middle of busy traffic. I was able to get to the shoulder and restart the truck, but no warning lights came on so I continued on my drive when approximately 20 minutes later, while still on a busy freeway, the engine shut off again. I was able to restart the truck and within another 15 minutes the check engine light appeared, the engine lost power and started making a loud rattling noise. Roughly 2 minutes later, as I was attempting to pull over to the shoulder and safety, the truck shut off and would not restart. This was the 3rd time for it to stall out on a busy freeway which was very dangerous for myself and the other drivers. I contacted the local Chevy dealership and they sent a tow truck out to tow the truck back to their dealership service center. I was later contacted by a service advisor that said they found a code P0016. He informed me that the engine would need to be replaced. As of today 8/11/26, they are still waiting on backordered parts to arrive before they can even start on any repairs. 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
#11756360August 11, 2026
UNKNOWN OR OTHER
The OnStar module in the truck is broke it affects all communications. The truck has including things like let me know what the speed limit is. It happened after they did a software update, which seems a little fishy because there was nothing wrong with it before I understand. Some people were having problems with this module, causing their batteries to die, but now I’m the one having issues and they won’t seem to fix it unless I pay them $900.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755885August 10, 2026
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
Was traveling home and started losing power going up a hill on XXX. The truck was surging, the check engine light came on and an audible warning of no (low?) oil pressure. The truck shut off on a busy interstate highway and barely got onto the shoulder. The tow truck driver had to lay on the ground with part of his body in the lane of travel to place "skids" under the rear tires because there is no way to place this vehicle in neutral for a tow without a special GM tool. When I contacted Harry Robinson GMC service center in [XXX], they told me that it was no longer a safety recall because the truck had passed diagnostics and new, high viscosity oil was put in the truck XXX. The GMC app says code P0016 which is the dreaded 6.2L camshaft to crankshaft alignment that accompanies engine component failure. 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
#11755890August 10, 2026
POWER TRAIN
My truck threw the code p0747 for fail valve body. When I do my research its a common problem. GM is stating my truck isnt covered.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755830August 10, 2026
STRUCTURE:BODY
I started to notice detached broken plastic pieces behind the upper grill housing. I notified the dealer, and in the meantime of trying to figure out what to do, the upper grill housing came detached when I was driving down the highway and flew up and back onto the highway. Sounds similar to safety recall N242490120, which was for 2022 model year trucks. Not sure why this stopped at 2022, but it happed on my 2023.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755698August 9, 2026
ENGINE
Driving on the highway near Rockport, WA, when vehicle suddenly loss propulsion, engine light appeared, and vehicle went into transport mode enabled. Without causing an accident, I was able to pull to the side of the road. Once I put vehicle in park, it shut off and displayed, “Tranport Mode On. Vehicle would not start and was towed home. My son-in-law was able to disable transport mode, but vehicle still will not start. Will notify dealership on Monday.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755699August 9, 2026
ENGINE
Driving on the highway near Rockport, WA, when vehicle suddenly loss propulsion, engine light appeared, and vehicle went into transport mode enabled. Without causing an accident, I was able to pull to the side of the road. Once I put vehicle in park, it shut off and displayed, “Tranport Mode On. Vehicle would not start and was towed home. My son-in-law was able to disable transport mode, but vehicle still will not start. Will notify dealership on Monday.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755700August 9, 2026
STRUCTURE:BODY
Vehicle: 2023 GMC Sierra 1500 SLE VIN: [XXX] While driving southbound on [XXX] near exit [XXX], the front upper grille molding/deflector completely detached from my 2023 GMC Sierra 1500 SLE at highway speed and separated from the vehicle, creating a potential road hazard for other motorists. Prior to the complete separation, I noticed that the upper grille molding was becoming loose and lifting away from the vehicle. I stopped and photographed the component and its attachment areas. The photographs show failed/broken attachment points while the molding was still partially attached to the truck. Later, while driving on [XXX] to work, the remaining attachments failed and the entire molding separated from the vehicle. The part could not safely be recovered from the interstate. The vehicle recently underwent dealer service involving the active grille shutter/damper area near this component. I cannot determine whether that service contributed to the failure, so I am reporting it as part of the vehicle's recent service history rather than asserting it as the cause. I subsequently became aware that NHTSA Recall 25V-060 / GM Recall N242490120 addresses separation of a front upper grille deflector on certain GMC Sierra 1500 vehicles due to fractured attachment points. My vehicle is a 2023 model and does not presently appear to be included in that recall. Because my vehicle experienced a similar failure mode resulting in the exterior component completely separating at highway speed, I am submitting this complaint so NHTSA can determine whether this condition may extend beyond the vehicles currently covered by the recall. Photographs documenting the component and failed attachment areas before its complete separation are available. 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
#11755702August 9, 2026
STRUCTURE:BODY
While driving southbound on Interstate 95 in Florida, the front upper grille molding/deflector completely detached from my 2023 GMC Sierra 1500 SLE at highway speed and separated from the vehicle, creating a potential road hazard for other motorists. Prior to the complete separation, I noticed that the upper grille molding was becoming loose and lifting away from the vehicle. I stopped and photographed the component and its attachment areas. The photographs show failed/broken attachment points while the molding was still partially attached to the truck. Later, while driving on I-95, the remaining attachments failed and the entire molding separated from the vehicle. The part could not safely be recovered from the interstate. The vehicle recently underwent dealer service involving the active grille shutter/damper area near this component. I cannot determine whether that service contributed to the failure, so I am reporting it as part of the vehicle's recent service history rather than asserting it as the cause. I subsequently became aware that NHTSA Recall 25V-060 / GM Recall N242490120 addresses separation of a front upper grille deflector on certain GMC Sierra 1500 vehicles due to fractured attachment points. My vehicle is a 2023 model and does not presently appear to be included in that recall. Because my vehicle experienced a similar failure mode resulting in the exterior component completely separating at highway speed, I am submitting this complaint so NHTSA can determine whether this condition may extend beyond the vehicles currently covered by the recall. Photographs documenting the component and failed attachment areas before its complete separation are available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755712August 9, 2026
ENGINE
2026 Denali, 6.2, failed after getting off express way while on my way for a fishing get away and pulling my boat. NO warning lights, noises, nothing. Came to a stop sign and at the last second slammed into park. Dash went black, 10 seconds later would come back on and try to start, then the dash goes black. Sheriff pulled up 20 or so minutes later and told my wife to get back into the vehicle as she was directing semis and other cars to go around. Towed to a chevy dealership 13 miles away. After Running tests on the truck, came up blown engine. 7600 miles. 5 hours later we left with a loaner and able to continue on with our plans. I do thank the dealership for their help and loaner. 23 business days later they delivered my truck to my house and returned in the loaner. After all my investigating on these engines, I will not be buying another one. Time for GM to invest some of their profits into finding the problem!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755718August 9, 2026
TIRES:TREAD/BELT, TIRES
Catastrophic failure of drivers side rear tire. Complete delamination of tire causing severe vehicle damage. Tire and vehicle is available for inspection upon request. Tire exploded causing serious risk to passengers at highway speeds. Tire has not yet been inspected due to date of incident being on Saturday. Immediately prior to incident a small vibration was noticed in the rear approximately 1 minute before failure. Tire pressure was at 80 psi when troubleshooting vibration while traveling. Tire size 275/65 R20
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755734August 9, 2026
ELECTRICAL SYSTEM, SERVICE BRAKES, STEERING
My 2023 GNC Sierra 1500 has experienced a recurring electrical and safety-related malfunction on multiple occasions while driving. The dashboard and warning lights intermittently flash on, and off and numerous warning messages appear simultaneously. During previous occurrences, warnings included power steering service, safety restraint system, check engine and transmission related messages, including a message instructing me to pull over and shut the vehicle off. During one occurrence, the electric power steering assist stopped working while I was driving. The vehicle was taken to an authorized GMC dealership multiple times while under the factory warranty. The dealer replaced the Brake System Control Module and performed vehicle-wide software/programming updates. When the problem continued, the dealer contacted GM Technical Assistance. The Dealer subsequently diagnosed an intermittent open circuit involving the electric power steering rack-and-pinion/steering gear assembly and replaced the complete steering gear assembly. Despite these repairs, the malfunction has occurred again, during another occurrence while driving on the freeway, the dashboard flashed on and off and multiple warning lights and messages repeatedly appeared, similar to the condition that occurred before the steering gear was replaced. The vehicle currently has approximately 55,000 miles. The condition remains intermittent despite multiple repair attempts. I am concerned that this recuring electrical or vehicle communication failure could again cause loss of power steering assistance or affect other safety-related vehicle systems while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755776August 9, 2026
ENGINE
Lifter failure at 20000 miles
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755634August 8, 2026
ENGINE
The lifters collapsed on cylinder 3 causing the camshaft to shed metal into the oil leading to bearing failure. Leaving us stranded 210 miles away from home. Motor has 85,909 miles. This is the same problem that the 2021 model year trucks have that has a recall. The 2019 model years have the exact same problems. I personally know 6 people who have had this happen. Check out the Facebook page. GM 6.2 Lifter and bearing failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755666August 8, 2026
STRUCTURE:BODY
While driving my 2023 GMC Sierra on the highway at highway speeds, a piece of the front grille suddenly detached and flew off the vehicle. There was no prior accident, impact, or external damage to the grille; the part failed and unclipped on its own due to defective manufacturing or weak retaining clips. This creates a severe safety hazard as the flying debris could have struck the windshield of the vehicles traveling behind me, potentially causing a major accident. I am aware that the 2022 GMC Sierra has an active recall (N242490120) for this exact same issue, yet GM is refusing to cover this 2023 model under warranty or recall despite presenting identical component failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755385August 7, 2026
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, VEHICLE SPEED CONTROL, FORWARD COLLISION AVOIDANCE: WARNINGS
Current Unsafe Conditions: Post-Replacement Active Safety Failures. The vehicle presently exhibits two distinct categories of active, ongoing, and dangerous safety failures, both of which were introduced as a direct result of the engine replacement performed by Monument Chevrolet: (a) Severe Drivability Failure. Between approximately 1,500 and 5,000 RPM, the engine repeatedly and without warning lunges forward, drops all power, and lunges again — cycling in this manner between three (3) and six (6) times before stabilizing. This behavior occurs across all gears and driving conditions, which creates a severe and unpredictable hazard particularly when merging into traffic or accelerating onto highways. This failure constitutes an immediate and ongoing risk to the safety of myself and other motorists. (b) Complete ADAS System Failure. The frontal crash response warning light is permanently illuminated on the instrument cluster, rendering the following federally relevant safety systems entirely non-functional: (i) Automatic Emergency Braking / Forward Collision Alert; (ii) Cruise Control; and (iii) Lane Change Assist / Lane Control System. All of these systems were fully operational and properly functioning before the vehicle was submitted for the engine swap. Their failure is an assembly defect introduced by Monument Chevrolet during the course of the repair and constitutes a warranty and safety defect for which General Motors, as the manufacturer and warrantor, bears full responsibility. Medical Hardship and Urgency. This vehicle is my sole personal transportation. It is essential for travel to active medical appointments and upcoming medical procedures. The ongoing failure of General Motors and its authorized service network to restore this vehicle to a safe and fully operable condition has created a serious hardship that directly affects my ability to access needed medical care. Yes, it was driven by a service department supervisor. He did experience the issues.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755389August 7, 2026
ENGINE, FUEL/PROPULSION SYSTEM
- vehicle started misfiring, ECM, valve timing code, throttle system code, data system, gateway, module,. Vehicle is available and currently at the GMC dealership for continued diagnostic. -this happened on the freeway and out of nowhere the vehicle started shaking, rough, losing power and acceleration, I had to cut someone off on the freeway just to get over to the right shoulder and turned off the vehicle called a tow truck and haven’t been able to use the vehicle since. Vehicle is unable to be driven due to safety issues of increased acceleration and loss of power, intense shaking. -the vehicle is at the dealership now, prior there was a diagnostic performed by a different dealer, and it has been confirmed. -the vehicle is at the GMC dealership now. -ECM check engine light came on prior to the vehicle misfiring and other codes coming up.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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