GMC Sierra Complaints

15,732 consumer complaints on file.

#11718877February 18, 2026
ENGINE
The vehicle experienced complete lifter failure on cylinder number 4 bending the intake valve push rod thus shutting down the cylinder. The vehicle has 167,000 miles and is well maintained. The vehicle gave no warning signs that there was a problem. Simply driving down the road, normal engine temperature, normal oil pressure, the check engine light comes on at the same time the engine begins to mis-fire. Pulling over to the side of the road, I could hear lifter noise from the right bank of the engine. The dealership (Ocean Crest Chevrolet/GMC Warrenton, Oregon) confirmed the damage. The mechanic and the service manager both state the damage is a direct result of the GM cylinder deactivation system, and every single one they have repaired has been cylinder number 4. They further stated that GM has recommended a lifter change when repairing the damage, in other words, the lifters that were installed when the engine was originally built are defective. This damage occurs on both the 5.3 and the 6.2 with cylinder deactivation, and according to the dealership, it begins with cylinder number 4. This problem has also been responsible for cam damage which results in total engine replacement/rebuild due to metal contaminating the oil.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718909February 18, 2026
ENGINE
I get alert saying low oil pressure and the truck turned it's self off and won't start back up. And I got car's and 18 wheelers coming up from behind. They're not paying attention to my emergency lights flashing. It did this twice on me, first time in my neighborhood and the second time on major road with a lot of traffic. I call GMC Corporate office and they know about the Recall on the 2024 GMC Sierra engine cutting off. I was told I need to get a picture or video of the dashboard say low oil pressure and video with me trying to start it back up. I guess I'll have to get hit or kill for them to replace the engine. I have no documentation because I have no picture or video. Didn't know I was supposed to take a picture or video.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718939February 18, 2026
ENGINE, FUEL/PROPULSION SYSTEM, UNKNOWN OR OTHER
Engine lost all power while I was attempting to make a left turn at a very busy intersection. Dash kept saying “check battery”, jump pack did nothing. Engine wouldn’t start.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718970February 18, 2026
ENGINE
The failed component is the engine coolant control valve on a 3.0L Duramax truck. The failure has been documented and confirmed by both an independent mechanic and an authorized dealership. The malfunction creates a significant safety hazard. Without warning, the truck will suddenly enter a reduced engine power mode while traveling at normal highway speeds. When this occurs, the vehicle will not allow acceleration beyond approximately 50 miles per hour. This is especially dangerous when operating on roadways with speed limits of 70+ mph, as the sudden and unexpected loss of power places myself and surrounding motorists at risk. The problem has been reproduced and confirmed by Steele GMC in Round Rock, Texas. In addition, the vehicle has been inspected by an independent mechanic, both of whom verified the coolant control valve failure. Prior to the initial occurrence of the failure, there were no warning signs. Once the malfunction occurred, the check engine light illuminated. General Motors has issued Service Bulletin #25-NA-185 (revised December 4, 2025), which addresses engine coolant control valve failures on 3.0L Duramax vehicles and outlines the proper diagnostic and repair procedures for this exact failure mode. This bulletin applies to 2021–2026 3.0L Duramax trucks. Additionally, GM has implemented Special Coverage program N252508341 for 3.0L Duramax coolant control valve failures, which extends coverage up to 15 years or 150,000 miles when diagnostics confirm the failure condition. Despite the fact that my vehicle’s documented failure matches the exact conditions described in the above-referenced service bulletin and special coverage program, I was informed by Steele GMC that my specific VIN is not included in the warranty. Given the documented safety risk, the confirmed diagnosis, and the existence of official GM guidance addressing this precise issue, I respectfully request this be reviewed and appropriate coverage or corrective action be authorized
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718679February 18, 2026
POWER TRAIN
During day to day driving when the truck is accelerating from a stopped position there's a massive clunk or hard shift from either 1st to 2nd gear. have also heard similar complaints from other 2015 sierra 1500 owners saying the transmission is having a hard shift on acceleration from a stop. Have seen possible issues with the TCCM
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718685February 18, 2026
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, LANE DEPARTURE: ASSIST
Onstar module stopped working
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718751February 18, 2026
ENGINE AND ENGINE COOLING
See attached document for complaint.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718761February 18, 2026
ENGINE
Engine loss of power many different engine code took it to the dealership. Now they say lifters, rockers are loose and worn,broken,the cylinder 5 misfire, engine needs rebuild at 88,000 miles. Dealer wants over ten thousand dollars to take apart and repair
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718801February 18, 2026
SERVICE BRAKES, HYDRAULIC
The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was firm and unresponsive, and the vehicle was difficult to stop. The vehicle eventually came to a stop with the ABS warning light illuminated. The vehicle was driven back to the residence. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 132,235.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718386February 17, 2026
STEERING, SUSPENSION
While driving 13-15mph down the road the front right upper control arm ball bearing sheared off causing the tire to lean in rubbing the wheel well, forcing my truck to veer to the left across the other lane of traffic. Luckily there wasn't any car next to me.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718452February 17, 2026
POWER TRAIN
The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at various speeds, there was an abnormal vibration in the steering wheel. There was no warning light illuminated. The contact stated that the tires were replaced, and the wheels and bearings were inspected by an independent mechanic, but no failure was found. The independent mechanic related the failure to an undisclosed transmission recall; however, the dealer informed the contact that the VIN was not under recall. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 28,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718471February 17, 2026
ENGINE, POWER TRAIN
My engine is projecting a ticking sound. Oil consumption is extreme.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718485February 17, 2026
POWER TRAIN
Tranmission is shuttering and not wanting to shift right
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718551February 17, 2026
ELECTRICAL SYSTEM, ENGINE, POWER TRAIN
This 2024 GMC Sierra Heavy Duty has experienced a continuous pattern of major mechanical and electrical failures since early ownership. The vehicle required a complete engine replacement under warranty at approximately 43,626 miles. Since that time, the vehicle has continued to experience repeated injector failures, control module faults, communication errors, and voltage-related system issues. Current diagnostic codes indicate multiple simultaneous failures including ignition relay feedback circuits, control module power faults, gateway communication loss, brake system communication faults, and battery voltage circuit errors. The dealership has diagnosed a power distribution / fuse block failure at approximately 79,000 miles. These electrical failures affect multiple vehicle systems and raise concerns regarding reliability and potential safety risks due to loss of communication between control modules and possible braking system interaction. The vehicle has been in the dealership numerous times for repairs including engine replacement, injector replacement, control module reprogramming, and electrical diagnostics. I am submitting this complaint due to concern over a potential systemic electrical defect and ongoing reliability issues.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718612February 17, 2026
ENGINE, UNKNOWN OR OTHER
This vehicle since early inception of ownership has been brought to the dealer for failure to start, oil consumption and the vehicle stopping suddenly on it's own. There have been 13 service calls and each time the vehicle has been brought to dealer for the problem at hand shortly after that the vehicle was brought back again for the same issue and eventually escalating into other severe problems. The vehicle is unsafe to drive because it suddenly stops without warning, oil is being burned and needs replacement more often than it should. The vehicle recently had to be towed because it stopped and could not be started. The manufacturer claims that there is nothing wrong with this truck. However, this was disputed by a second dealer that examined the vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718623February 17, 2026
POWER TRAIN
I have had shuddering on the highway and a few hard random diwnshifts. Last week I went to start my truck and the transmission started grinding and rattling. I was told after towing to the dealer it needed a transmission due to pump not getting enough fluid and had failed. I was told I needed to pay, even though the part causing the problem had a extended 150,000 miles and the subsequent pump failure is a result of the control valve failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718652February 17, 2026
POWER TRAIN
Transmission has failed twice in 2023, dealer carried out repairs but still the Transmission started shuddering after every 1000 miles, truck has been in service centre for almost 12 times for the repeated issue but no permanent solution, after my bumper to bumper warranty got over in 2025 September again service Transmission sign appeared and got my valve body replaced on January. after a month on feb the same message appeared again to service transmission and they refused to cover the issue in warranty and asked me to pay almost 7k dollors to get it repaired.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718207February 16, 2026
ENGINE
Engine failure as related to RQ26-001. engine misfires after following recommended maintenance schedule for 6.2L engine. Vehicle is at dealership and available for inspection and dealer is recommending engine replacement. Engine light came on and was brought to GMC dealership same day.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718238February 16, 2026
ELECTRICAL SYSTEM
This happens many times, at random intervals, and sometimes it does not happen at all, but I would say about 33% of the time, it happens. When you put the vehicle into reverse, the side mirrors will lower slightly, so that its easy to see the ground, or parking lines, etc. When you then go back to park or forward gear, the mirrors are supposed to go back to the position they were earlier. The original starting point. But that's the problem, many times, they do not go back to the starting position and you must then push the preset buttons to make them go back to your desired view angle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11718326February 16, 2026
UNKNOWN OR OTHER, ENGINE
For the past month I have noticed my truck has been dripping oil, I pulled the shield off and saw my engine oil cooler lines leaking at the crimp points. I’ve seen GM put out customer satisfaction notice but when I tried to have the dealership fix mine they said mine is covered under any recall or warranty. If the line comes uncrimped at highway speeds I’ll lose all my oil where the trucks engine could lock up and lose all forward motion and in my eyes could cause a crash
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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