GMC Sierra Complaints

15,732 consumer complaints on file.

#11753693July 30, 2026
ENGINE, POWER TRAIN
2021 Harley Davidson Sierra 4WD, 6.2L L87. Started the truck in the morning and immediately heard intermittent, very loud banging noise coming from engine. Shut truck down quickly and had it towed to dealer. Diagnosis was bent pushrods & failed lifters which were replaced under warranty. Factory warranty expired only 4 months after this failure, and the recall does not include my VIN so I did not get an extended warranty or any other protection. GM has yet to even reimburse the tow bill. Completely unacceptable for a truck that was well over $100k when new.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753775July 30, 2026
POWER TRAIN
While driving my 2022 GMC Sierra 1500 (VIN: [XXX]) in active traffic, the 10-speed automatic transmission suffered a sudden and catastrophic internal failure. Without warning, the vehicle stalled in the middle of traffic and forced itself into a hazardous "limp mode," severely restricting my speed and acceleration. This created an immediate, high-risk safety emergency, leaving my passengers and me vulnerable to a rear-end collision before we could navigate out of the live roadway. The vehicle was towed to an independent facility (Kenny's Transmission, Repair Order #XXX) at 65,579 miles. Diagnostic troubleshooting confirmed a "Number 6 Solenoid Code" and "Internal Transmission Mechanical Failure" (3-4 races away, total loss of reverse gear), requiring a complete replacement of the transmission assembly utilizing an official GM service part at a personal cost of $6,673.10. General Motors has previously acknowledged 10-speed transmission control valve defects and wheel-lockup hazards by issuing safety recalls for diesel variants, but gas-powered models like my 6.2L L87 engine are experiencing identical, highly dangerous sudden losses of motive power without federal recall protection. I am requesting that the NHTSA investigate this systemic failure rate on 2022 gas models before it causes a major collision. 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
#11753415July 29, 2026
ENGINE
Engine started making a loud knocking noise and it sounded like the engine was about to throw a rod. Turned engine off and called GM. Vehicle was towed to dealership and it was diagnosed with a thrust bearing failure. My truck only had 14k miles on it. To fix the bearing issue, it will need a new engine. GM does not currently have engines to replace the faulty ones so it has sat at the dealership for 3 weeks with No ETA as to when it will be fixed. This is apparently a common problem in the 2025-2026 models LZ0 3 liter diesel. They are still selling these affected vehicles currently, knowing that they may have a problem. GM needs to issue a recall and take these vehicles back.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753440July 29, 2026
ENGINE
ENGINE DIED!!,Had it towed to local dealer and was told I have L87 engine failure ,but the recall dosen't cover 2019 models. Service tech says it only covers 2021-2024 6.2 engines. Is there any action I can follow to be added to the recall. Thanks for your swift attention.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753444July 29, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving approximately 70 MPH, the vehicle suddenly lost motive power, decelerated, and failed to properly accelerate while depressing the accelerator pedal. The check engine warning light was illuminated. After exiting the freeway, the vehicle stalled. The vehicle was towed to the residence and then later towed to the dealer for assistance. The contact was informed that there were metal shavings inside the engine oil. The contact was informed that the engine needed to be replaced. The vehicle was not yet repaired. The contact was informed that the VIN was not included in NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the recall. The manufacturer was not yet contacted. The failure mileage was 149,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753455July 29, 2026
ENGINE
While traveling from [XXX] to [XXX] for vacation, I was in [XXX], and when I pulled off the interstate and came to a stop sign the vehicle quit. At first, I was unable to restart the Vehicle, but after sometime I got it started and was able to pull it off the road while the engine was making very loud clattering noise and the vehicle would not stay running. Prior to this there were no warning, lights or indications that the engine was going to quit. I checked the engine oil and it was full. I had the vehicle transported to a GMC dealer in [XXX], where it was diagnosed as requiring a new engine. The vehicle is a 2026 GMC Sierra 1500 Denali purchased in December 2025 and has 8,865 miles on it. A little over 4000 miles I had the vehicle oil changed at Starling GMC Titusville Fl. At the time of my service visit, I asked the service writer, [XXX] to check the engine idle because at times it seemed to run a little rough and it quit while pulling in my driveway one day. [XXX] advised me that there is no idle adjustment on the vehicle, so I said I’ll just keep an eye on it. There were never any indications of an engine problem prior to this or even as of now there are no warnings displayed on the instrument panel. I also subscribe to onstar and it indicates everything in the vehicle is normal with no issues. 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
#11753509July 29, 2026
POWER TRAIN
My truck is at the dealership for a failed transmission valve body. I was doing some research on this issue and saw recall N242454441. I asked the service writer about this and he said my truck was not covered by the recall. I had all of the same issues as described in the recall. effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code. I was driving along when the check engine light came on then a message on the dash said reduced power mode. I barely made it to work then called the dealership and told them I was bringing it in if I could make it. When I tried to take it to the dealership the rear wheels seemed to be locked up when in drive but would move in reverse. After coasting forward in neutral then reversing the wheels seemed to unlock in drive but then I didn’t have reverse. I have the same drive train with the 10 speed transmission. I think this recall needs to be expanded to include my truck as well as countless others for this known issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753543July 29, 2026
ENGINE, FUEL/PROPULSION SYSTEM
CORRODED GROUNDING STRAP FAILED CYLINDER 5 GLOW PLUG CIRCUIT CRACKED AND SEPARATED EXHAUST BACKPRESSURE VALVE
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753614July 29, 2026
ENGINE
6.2 l just blew up per dealership
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753626July 29, 2026
VEHICLE SPEED CONTROL
When I accelerate the vehicle, the gears shifts every 10mph when it shouldn’t. It does it all the way up to 60mph. It has been an on going problem since we got the truck
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753630July 29, 2026
ELECTRICAL SYSTEM
The contact owns a 2019 GMC Sierra 3500. The contact stated that while attempting to switch lanes, the side-view cameras failed to operate as needed. The vehicle was taken to a dealer where it was diagnosed with a disconnected wire from the side-view cameras. The wire had poor connection, which caused the cameras to fail due to low voltage. The vehicle was not repaired. The manufacturer was notified of the failure and stated that the part to repair the vehicle was no longer manufactured. The failure mileage was 53,004. The VIN was unavailable.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753262July 28, 2026
ENGINE
I Purchased the vehicle on May 29, 2026 and it stated the 6.2 liter engine recall had been fixed and that I have extended special coverage for the exact issue of the recall until 150008 miles on this vehicle. On July 14, 2026 the vehicle was being driven and stalled out at a traffic light and restarted, yet within a quarter mile it stalled again at the next traffic light and became completely disabled, it would not even allow a shift into nuetral, so I had it towed less than 100 feet into the Walmart on Loudon Road in Concord, NH 03301 parking lot. On July 23, 2026 I was able to get the batter charged and attach a code scanner which showed one code (P0016). Pursuant to Recall N252494001 (which had allegedly been repaired, likely with the bandaid fix of thicker oil) any 6.2 liter GM truck with the loss of propulsion needs to be plugged into a scanner and if code P0016 is present, engine replacement is needed. Specifically noted to the recall is Special coverage N252494003 which provides the coverage to 150,008 miles on this vehicle is directly related to the recall. At the time of loss of propulsion the vehicle had 99,195 miles present on the odometer. The following day July 24, 2026 I had the vehicle towed to Banks Chevrolet GMC in Concord NH, after the vehicle arrived, I spoke with the service department, provided them with the recall paperwork and printout of the special coverage uner the vin as well as a photo of the odometer and my scanner displayining one code P0016. They then informed me it would take them until August 24, 2026 to "diagnose" the vehicle. The recall is clear it just needs a code scan if disabled. I have contacted GM and informed them of the need for a loaner as the vehicle is a vehicle utilized for business. I have since been told they will try to look at it earlier and no loaner will be offered but I "may" be able to be reimbusred $44.00 a day for a rental. There are no rentals for that price that can tow over 9500 pounds. It is unnacceptable.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753276July 28, 2026
ENGINE
Unknown. Went in to get inspection for the recall on the motor and it failed the test so motor was replaced. Now the I've hade the motor for 9 moths started hearing knocking in the motor and losing power.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753323July 28, 2026
ENGINE
The Lifter on my GM Sierra AT4 truck with a 6.2L (L87) engine collapsed and damaged the engine shafts and cylinders in the block. While driving, the engine started to lose power, and a ticking noise started to occur. I pulled the car over to the side of the road and called the dealer, which told me to have the truck towed into the dealership. Metal was found in the Oil. The entire engine has to be replaced for $12K. I have a life time oil change service with the dealer an also an extended warranty, but my mileage was over the warranty by 6K miles. The warranty ended at 106K miles and actual milage was 113K. I reached out to my dealer and also to GM to discuss goodwill assistance and GM pushed back indicating they cannot do anymore. I asked the rep to esalate the ticket
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753374July 28, 2026
ENGINE
Going down the highway at highway speeds engine fully seized up almost cause an accident,, totally locked up engine, got towed to dealer and they said total engine failure just like in the priare years., been waiting for a new engine for almost 3month due to these failing on other cars,, they will be replacing my old engine with same engine that in prone to locking up. only a matter of time till the new one does the same thing. i want a buy back but they say it has 70k miles and its over the warranty and they wont buy back
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11752991July 27, 2026
TIRES:SIDEWALL, TIRES
No Incident Occurred. Tire Size 275/65R20. Tire Pressure Fluctuating between 59 and 71 PSI. 3 of 4 tires appear to have a defect. Was detailing the vehicle on 7/26/26 and noticed a tear in the Side wall on the Passenger side rear tire. About 3/4" to 1 inch away from the rim along the sidewall. Running parallel with the rim for about 4". Found similar defects and indentation lines on the Passenger side front and Drivers side rear, in varying lengths around the rim. Vehicle has Not Towed, had a Load in the bed or used off road. 1,897 miles all Pavement Mixed HWY and Street use. Vehicle was Purchased 6/25/26. Scheduled for Service 7/28/26. Will have the Dealer look at the tires.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753006July 27, 2026
ENGINE, POWER TRAIN, UNKNOWN OR OTHER
Subject: Event of engine failure • While driving on a level paved road at 15 miles per hour in a busy area my 2019 GMC Sierra Denali pickup truck stalled in the middle of a busy street. • Truck stalled in a heavy traffic area at an intersection putting myself and passengers in a dangerous area and situation. This obstructed the normal flow of traffic causing a danger to pedestrians and normal vehicle traffic pattern. Each had to go around my disabled truck into oncoming traffic putting them and normal traffic flow at risk. •Upon securing a towing service the truck was transported to the nearest GM dealership. This happened on a Friday afternoon and the truck got to the dealership after hours. I returned to the dealership the next morning and was told that they may not be able to check the truck until probably Tuesday. On Monday afternoon I called and they hadn't been able to get to it. I received a call the next day and was informed that the technician at the dealership had put a breaker bar to the crankcase and the engine would not move and therefore the engine is seized. • There were no warning lights that came on prior to the truck stalling in the street. There was no noise prior or any other symptom to give any indication that the truck was not operating in a normal fashion.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753048July 27, 2026
ENGINE
The vehicle has about 38000. The warrantee expired about 6 months ago. About three weeks ago I started the engine, it sounded like a cement mixer filled with rocks. I had it taken to my dealer. They investigated the problem and determined that it has bad lifters and bent push rods. The dealer told me that it is a known problem but it is not covered by the current 6.2l engine recall
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753087July 27, 2026
UNKNOWN OR OTHER, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, LANE DEPARTURE: ASSIST
Upper front grill trim piece was repaired under recall. After being fixed I was driving and it broke off flying up in the air and behind the truck. It did not hit another vehicle. Adaptive cruise control stopped working. Lane assist stopped working. Brake pad wear sensor error message stating it doesn't work. Vehicle has 19,000 miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11753107July 27, 2026
ELECTRICAL SYSTEM
The telematics module for the OnStar system continues to stop working, I have had this truck in a dealership service center multiple times for them to reset the system (instead of replacing the defective parts). Along with the infotainment system not working properly (cuts in and out, blinks on/off, delay in actions) Doors unlock while driving, front/rear cameras come on when I stopping at an intersection, I have given them documentation of the diagnostic reports from dealerships
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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