GMC Sierra Complaints

15,732 consumer complaints on file.

#11740204May 26, 2026
ELECTRICAL SYSTEM, POWER TRAIN, UNKNOWN OR OTHER
For no apparent reason the truck goes into “low power mode” and gives off code p2138 often happens around 30-35 mph. Have had it happen to me also around 45 mph also. I have replaced sensors and parts to which a month or so goes by and it happens again.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740229May 26, 2026
TIRES, TIRES:SIDEWALL
DOT AH9K82 3425 LT265/70R17 121/118Q All four brand new tires on my brand new truck have bulges on the sides of the tires. The truck feels floaty and unsafe at highway speeds. The car dealership is saying it’s fine, won’t replace them, and says it’s a known issue with the tire.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739883May 25, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, STEERING
My truck will not start when I press the push-button ignition. After waiting a few seconds and trying multiple times, it typically starts on the third attempt. Additionally, it will not restart after the auto stop feature activates at stop signs or traffic lights. This is very concerning, especially when pulling into oncoming traffic, as I’m worried the truck could shut off while I’m crossing. I have already had the battery, starter, and alternator checked, and all components tested fine. However, the issue is still occurring. There are also no warning lights or messages displayed on the dashboard.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739898May 25, 2026
STRUCTURE:BODY
I was driving, my front grill protector that was fixed with recall flew off again. This needs to be fixed. The part flew off hit my window and almost hit two cars that were behind me. This could of resulted in a bad accident. No warnings, it just happened.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739911May 25, 2026
ENGINE
My engine suffered an internal catastrophic event, and needs to be replaced
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739770May 24, 2026
UNKNOWN OR OTHER
Upon purchase of my 2025 GMC Sierra, it did not come with a physical manual. I asked the dealer about this and they said they did away with them, only providing the digital version. I contacted GMC recently as I saw the a recall dor 2026 models with this exact issue, but they did not seem to care and it was for 2026 models only. I find this to be a loophole GMC is following, and would just like a manual so I can log maintenance like a normal person without a phone or sitting in my vehicle. Thank you
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739728May 23, 2026
ENGINE
While driving at normal highway speeds, I got a warning light for engine overheat condition and cooling fans came on. I also got a warning that the engine would go to reduced power. I reported this issue to my local GMC dealer. Was told that this was a comm problem with this engine however: my vin number indicated that this vehicle was not covered under warranty N252508341. I was advised to bring it in for a $250 diagnostic check and repairs could not be made for at least 2 months because of backlog. Took my truck to a local vehicle repair shop where they diagnosed a faulty coolant control valve and replaced it for me for $2388.43. Why did GMC desert me?
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739749May 23, 2026
ENGINE
Good evening, I want to formally document what happened today regarding my GMC Sierra after I brought it to the dealership on Friday morning for transmission concerns that I had already reported. At that visit, the vehicle was inspected, and I was informed that the truck was still safe to drive while waiting for the extended warranty approval for the replacement parts that were needed. Unfortunately, today my family and I experienced a very serious and frightening incident on the expressway. While driving, the truck suddenly lost power, barely moved forward, and began shaking violently. We were placed in a very dangerous situation in traffic and struggled with great difficulty and fear just to make it home safely. Once we arrived home, the vehicle completely shut off and would not restart again. This situation was extremely alarming, especially because I had already reported the transmission problems and trusted the guidance given to me that the vehicle was still drivable. My family’s safety was put at risk, and I need this matter to be treated with urgency and seriousness. Please advise immediately on the next steps regarding the vehicle, towing assistance if necessary, and how this situation will be properly addressed. Thank you.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739758May 23, 2026
ELECTRICAL SYSTEM
2020 GMC sierra 1500 infotainment system including navigation,OnStar and voice command, stoped working on Friday May 15th with no prior warning. These systems are integral for modern safe travel and severely affects the value and driver confidence in the vehicle. It seems to be running mechanically sound but, with some of the communications and information systems not working properly I am unsure how much of the info is incorrect like the clock (which can not be set manually). I have scheduled an appointment with the dealer for June 2nd the earliest date available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739478May 22, 2026
STRUCTURE:BODY
Driving down the interstate and the front trim bezel on the hood flew off. The plastic clips broke from underneath. GM had a recall on this same issue in 2022 but not 2023 yet. Could of had an accident with the piece flying off at interstate speeds.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739515May 22, 2026
ELECTRICAL SYSTEM, STEERING
Shift to park dings continuously and vehicle won’t turn off draining battery leaving doors unlocked. Don’t want to force into park and break anything more.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739589May 22, 2026
SUSPENSION, UNKNOWN OR OTHER, POWER TRAIN
They should be responsible for repairs or replacement of the cheap made frames that rust away so fast so u ain’t gotta worry about your truck fallling apart going down the rd and the lower control arms made of cast that rust from inside out and you don’t know until breaks while driving along with camber adjustments where they can throw alignment out with a single bump. Mostly the frame replacement is major always having to plate frame or check to make sure it will be able travel long trips or haul stuff in bed or a trailer with breaking or falling off truck causing wreck frame repair is major and time consuming if you don’t have proper stuff and definitely expensive and lower control arms that’ll make a wheel come real fast and it’s time consuming and expensive too but very dangerous and breaks and causes damage right then and there at high or low speed on highways or interstates
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739273May 21, 2026
ENGINE
Engine component failure. If not identified early could have caused catastrophic failure being disabled in traffic. This problem has been diagnosed and confirmed by a certified GM dealership. Initial warning sign was a knock in the engine, no warning lamps. First identified on 9/2/25 at 80,345 miles. Dealership changed oil to a higher viscosity. Problem gradually got worse, diagnosed #3 cam lobe failed 3/9/26 at 85,437 miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739316May 21, 2026
ENGINE
This vehicle has experienced repeated catastrophic engine and drivability failures since purchase and has now undergone four engine replacements under warranty. Despite these major repairs, the vehicle continues to experience dangerous shutdown/stalling conditions. The primary safety issue occurs while braking or coming to a stop. The engine will suddenly shut off unexpectedly, creating a serious traffic hazard and leaving the vehicle unable or difficult to restart. This has occurred multiple times and creates a dangerous situation in traffic and at intersections. The vehicle remains under manufacturer warranty, however the defect has not been successfully repaired despite extensive service attempts and multiple complete engine replacements. The condition substantially impairs the safety, reliability, and use of the vehicle. This vehicle was acquired through a fleet/lease arrangement for company use and was not purchased for resale. It is a light-duty 1500-series pickup with approximately 7,100–7,200 GVWR used as a company vehicle. Complete repair history, diagnostic records, warranty repairs, and engine replacement documentation can be obtained from: Stevens GMC Bristol, Connecticut The vehicle has been repeatedly presented for repair and the defect remains unresolved. This appears to be a serious ongoing safety-related defect involving engine shutdown/stalling while braking or stopping.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739360May 21, 2026
ENGINE
Engine failure after passing PICO test. Engine completely locked up on a busy highway without the ability to even put it in neutral. Yes, confirmed by dealer that there were metal shavings in the fluid. Inspected by authorized dealer. No lights came on in the vehicle prior to the engine failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739399May 21, 2026
ENGINE
After the vehicle was purchased in October 2023, it immediately had an issue shifting very hard. After numerous trips to the servicing dealership in attempts for error codes to be discovered with no success, the dealership gave the recommendation to flush the transmission as this was a fix for this type of engine in November 2024. The transmission was completely flushed in November 2024. The vehicle continued to have the issue with hard shifting and also developed less efficient gas mileage and would misfire upon ignition and there was a constant knock when running. After a prominent ticking began in May 2026, it was discovered that the timing chain was broken and we were told the rods could impale the engine and go through the hood if the engine was not replaced. The engine had completely failed and needed to be replaced including radiator and hoses. The engine, radiator, and hoses were replaced 05/2026. The invoices for both of these Service transactions are attached. After much research and advice, it appears this issue was the same issue that was happening with the other 6.2L L87 engines from the years 2021 to 2024 that were recalled.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739416May 21, 2026
ENGINE
On May 13. 2026 traveling southbound on I15 Utah at 75 MPH the engine Stop and put the tranmisson in N and I move the truck to a stop. then the Truck shut Down. I had the Truck tow to the nearest GMC and was informed that the Engine had sezed. I had recalled done to pervent engine failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738994May 20, 2026
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Starter went out and needed replaced. I know there is a recall on other models in the same year and mode;l but mine wasnt listed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739028May 20, 2026
ENGINE
The contact owns a 2026 GMC SIERRA 1500. The contact stated while driving 40 MPH, the vehicle independently engaged into limp mode. A dealer was contacted. The vehicle was towed to the dealer where it was diagnosed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was not notified on the failure. The approximate failure mileage was 10,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739083May 20, 2026
ELECTRICAL SYSTEM, POWER TRAIN
Check engine light illuminated with service transmission. The next day transmission started slipping and finally would not engage in reverse. Dealership Has it now and after diagnosis they advised that they had replaced the electronic control module to which, on the test drive, the gauge cluster blacked out and they got more codes. The cpdes that the vehical threw were the transmission valve body needed to be replaced.The truck has 24k miles on it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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