GMC Sierra Complaints

15,732 consumer complaints on file.

#11696993November 2, 2025
ENGINE, POWER TRAIN
My wife was driving at highway speeds with all are kids when the trucks motor suddenly loss all power all check engine lights illuminated and what I'm assuming had major engine failure causing rod knock.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696998November 2, 2025
ENGINE
While driving the vehicle at approximately 40MPH the motor made a tapping sound, I was able to pull into a parking lot and have the vehicle towed to the dealer. The dealer told me that the vehicle was out of warranty and appeared that under initial inspection the would have to rebuild the motor due to a lifter failure at the estimated cost of $18,000. I had the vehicle towed to a reputable repair shop and after the did a tear down to the small block they determined a bent push rod and broken lifter, all pushrods and AFM lifters were replaced at the cost of $10,754. dollars as invoice shows. The issue occurred again on 10/25/25 causing catastrophic failure that will cost me a complete engine replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11697009November 2, 2025
ENGINE
I experienced lifter and camshaft failure on my 2020 GMC Sierra equipped with the 6.2L V8 engine at approximately 72,000 km. GMC denied warranty coverage as my factory warranty had expired only four months earlier. The repair cost me nearly $10,000 out of pocket. My vehicle has been meticulously maintained with regular oil changes performed at my local GMC dealer every 5,000 km, and it has always been fueled with premium gasoline as recommended by the manufacturer. The engine failure was sudden and unexpected. All lifters and the camshaft were replaced during the repair. Since the repair, I have noticed intermittent RPM fluctuation under light load conditions. I am currently working with my dealer to diagnose whether this issue is related to the recent engine repair or a transmission flush that was performed at the same time. I am extremely disappointed in GMC’s handling of this situation. Despite this being a well-documented issue with the 6.2L engine, I received no goodwill assistance or warranty consideration from GMC. While my dealer provided a partial discount on parts and labor, I was still responsible for nearly the entire repair cost. I hope GMC and NHTSA will review this matter closely, as owners should not be facing such expensive failures on well-maintained vehicles with this engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11697071November 2, 2025
ENGINE
Was driving at about 55 mph and vehicle popped up with warning and said shift into neutral to restart. I tried to and all power turned off. This was at around 8 p.m. so no headlights or anything. Luckily got it stopped without hitting anything. Had vehicle towed and motor was locked up. Spun bearing they said. Same issue apparently as other 6.2 liter engines have been having.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696920November 1, 2025
ENGINE
Engine Failure. 1. The lifter in cylinder 5 failed (dropped) this prompted me to bring the truck in initially. 2. Upon further inspection all the cam bearings were scored and out of spec. Waited 4 months for an engine replacement from GM. Eventually I cut my losses and sent the block to a machine shop. This was all paid out of pocket. Truck had 74,000 miles on it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696921November 1, 2025
ENGINE
A lifter in my cylinder is bad and damage to my cam shaft. This truck also has the 6.2L engine that was recalled for other GMC Vehicles.My safety was put at risk as I was driving it and it started smoking. I have had 2 different mechanics look at it. One mechanic was an independent business, the other was a certified GMC dealer. There was no warning lamps or messages.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696941November 1, 2025
ENGINE
Engine suddenly lost power at highway speed. Truck was still running so I was able to get off the highway. Engine failure was caused by bent lifter. Lifter failure also caused damage to the camshaft. Vehicle was at dealership for significant time with a large repair bill that GM is not willing to cover due to the vehicle being 5 weeks out of warranty
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696942November 1, 2025
ENGINE
I keep getting low oil warning even after oil change
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696958November 1, 2025
STEERING
Without any notice, I lost my power steering while driving. The wheel jerked to the side, and when I corrected I realized that I no longer had power steering. I was still able to "steer" my vehicle, but not without brute force. If it were someone of lesser ability (e.g. elderly) it may have led to a devastating outcome. I have yet to get the issue diagnosed, as it just happened yesterday, but it certainly is concerning! I just wanted to bring this to the attention of the NHTSA, as I've since learned that I'm not the first GM Sierra owner to suffer this malfunction.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696714October 31, 2025
ENGINE, SEATS, POWER TRAIN
I purchased a 2018 GMC Sierra 1500 6.2 Denali new. I followed all service requirements including oil changes by GM dealerships. 2025 i noticed my truck power was decreasing. Than I started to hear knocking noses. I took it to a dealership for diagnosis but they couldn't identify anything. Finally it started to skip this is when a dealership diagnose it as being an issue with the active fuel management system. They said my lifters, camshaft, and various other parts was damaged and had to be replaced. Additionally, they said it was a recall on 6.2 engines with the same identical issue but my year wasn't included. The cost to repair approximately 10,000. I really need your attention to this matter! September 10, 2025 my truck placed me and others in danger when it lose engine power. Also my engine light was on for the first time.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696738October 31, 2025
ENGINE
Engine failed December 2024 at 140,274 miles. 2 cylinders failed due to lifter failure and had a total loss of power. Engine was replaced by a local shop.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696751October 31, 2025
POWER TRAIN
The engine started making ticking sounds, then the check engine light came on on and it began running very rough. GMC dealer replaced camshaft, all 16 lifters and guides and one bent push rod. The repair (not including transportation - I had to leave in GallupNM when I was enroute to Minnesota) cost was $7,832.81. The vehicle has 93,000 miles
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696792October 31, 2025
FUEL SYSTEM, GASOLINE
The contact owns a 2022 GMC Sierra 1500. The contact stated that while attempting to start the vehicle, the check engine warning light illuminated. A dealer was contacted. The vehicle was taken to an independent mechanic to be diagnosed, and DTC: P0449 and P0498 were retrieved. The vehicle was not repaired. The contact related the failure to a Special Coverage Adjustment Program for the Evaporative Emissions Purge Pump; however, the VIN was not included in the coverage. The manufacturer was notified of the failure and informed the contact that the VIN was not under recall and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was 56,418.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696859October 31, 2025
ENGINE
Sudden lost of power while driving. I was driving on the i95 and out of nowhere the vehicle shut off in the middle of the highway. It was a scary moment because I could of been in serious accident. All the engine signs were displayed on the dashboard.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696867October 31, 2025
ENGINE
Engine lag and performance drops while driving vehicle. Vehicle was taken to the dealership and remained at dealership for five days. Employee was given permission to drive the vehicle to experience the issue. Issue was confirmed by dealership, but they stated it's one of three issues and they would have to repair all three issues at my cost to figure out what's causing the engine lag.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696869October 31, 2025
ENGINE
This occurred 5+ years ago. Coming home one night I had a sudden loss of power with the truck and barely made it home. Was able to limp the truck to the dealership the next day and was told that one side of the engines lifters had failed. Prior to the failure I had noticed a ticking sound coming from the engine that was becoming increasingly more prominent. It was several thousand dollars to repair. Fortunately the failure occurred near home, not on the freeway where I could have been dodging cars while trying to limp the truck to the shoulder. Some online research while the repair was being done revealed that several other owners with the 6.2L engine had the same problem. When I mentioned it to the dealer the response was that they had no bulletins from GM on the issue and I was stuck with the bill. Got the same response a year or two later when the torque converter on the transmission went out. The reason I am reporting it now is I saw that GM is recalling 6.2L vehicles with lifter issues but not back to 2015 even though the issue appears to go back farther than that. They claim it's limited to a specific run of engines for the recall. They have been having various lifter problems for many years that have put drivers in danger when they fail but refuse to acknowledge it. As for the repair they made to the engine I've driven another 70 K miles and the ticking has started again. I fear another failure. Please note that the date previously given for the incident is my best guess.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696564October 30, 2025
VEHICLE SPEED CONTROL:ACCELERATOR PEDAL
The contact owns a 2025 GMC Sierra 1500. The contact stated that while tapping the accelerator pedal, the vehicle suddenly accelerated. The contact stated that the tires were squealing. The contact drove over a cement barrier after depressing the accelerator pedal. There were no warning lights illuminated. The local dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted but no assistance was provided. The failure mileage was approximately 7,800.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696287October 29, 2025
FUEL SYSTEM, DIESEL, ENGINE
The contact owns a 2024 GMC Sierra 2500. The contact stated that the vehicle was idling roughly, and the RPM fluctuated between 500 and 1,000 RPM while idling. The check engine warning light was illuminated. Additionally, the contact stated that the fuel economy had decreased to 13 miles per gallon. The contact stated that upon scanning the vehicle, the contact retrieved DTC: P0606 and P062B. The contact related the failure to GM Campaign Number: N232415860 (Fuel Injector Flow Rate Compensation). The dealer was contacted and informed the contact that a fee would be charged for a diagnostic test. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 70,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696291October 29, 2025
ENGINE
Defective out cool oil return line on v8 6.2L engine. Causing the truck to lose oil immediately due to being under pressure. Caused complete engine failure and required a new engine. That took 4-5 months to complete. Located in park city Utah a cold weather location. Not part of the 2019 recall for the same failure that gmc did in Canada and Alaska for a defective cool oil return line. When I called gmc to talk about it they referenced my vin and said it had no open issues and that they couldn’t talk about it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11696307October 29, 2025
ENGINE
Rod bearings spun and engine locked up while driving 70mph on the freeway. I was in traffic, and had to work my way over and off to the shoulder of the road. The engine was diagnosed and replaced by Hiley GMC at a cost of nearly $5,000 out of my pocket. This was at approximately 63,000 miles. Just out of warranty. No loaner vehicle provided. I was without my truck for 2 months. There were no warnings at all. No lights or noises of any kind. Rod bearings spun again on the replacement engine approximately 35,000 mile later. It happened same as before. Driving on the freeway at 70mph, and the engine seized. No power steering, no warning noises or lights. I had to coast across lanes through traffic and onto the shoulder. Diagnosed and replaced by Jerry's GMC. They replaced the motor at no charge except I had to provide the new radiator because it was on backorder. They had the truck for over 3 months and I had no loaner vehicle. With approximately 65,000 miles on the latest engine, a lifter went out. I put it in the shop to have all the lifters replaced, and motor mounts replaced at a cost of $6500. Upon taking the truck for a test drive, the engine seized in traffic under an overpass and blocked one lane of traffic. The shop dropped the oil pan to check it out, and, lo and behold, this engine has spun rod bearings again. There is definitely a serious and dangerous problem with the L87 6.2L. Being a 2020, it is not currently included in the recall, but it needs to be included. I spun bearings the first time in August of 2021. I was hoping it was just bad luck. I hadn't heard of all the instances at the time. I've never had a major engine failure prior to this model, and this one has failed 3 times in the same truck with meticulous maintenance.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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