GMC Sierra Complaints

15,732 consumer complaints on file.

#11713207January 25, 2026
POWER TRAIN
My vehicle has lurched forward upon the first engine start of the day, under no throttle, on several occasions, throughout the life of my vehicle. Shortly after starting my 6.2 engine in my garage, if I shift my 8L90 transmission into Drive as soon as the engine RPMs settle to idle, the vehicle will lurch forward, screeching the tires. Luckily, I had my foot on the brake hard enough such that no one was injured. The harsh transmission shift into drive is dangerous, possible injuring passengers or my garage door. I've learned that if I wait 5 to 10 seconds, allowing the engine to idle (while the transmission oil becomes pressurized ??), then the shift into drive is normal, without any lurch.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713209January 25, 2026
ENGINE
The oil consumption is abnormal and burns almost 2.5 to 3 quarts between oil changes. This can be a heavy risk to the engine if I don’t check on it every couple weeks. I don’t think after the price I’ve paid for this truck that I should have this concern and this should not be the case
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713221January 25, 2026
ELECTRICAL SYSTEM, POWER TRAIN, VEHICLE SPEED CONTROL
This malfunction is ongoing and the dealership cannot fix the problem. The first time it happened in September 2025. I was driving down the road and the gauges started to go crazy. The screen on the dash said reduced acceleration. Then it said Service ESC. Then it said Service Traction Control. It would not let me go over 40 mph. I took it to the dealership and they told me I needed a valve body replacement. They installed the valve body and that did not fix the problem. It happened again and said reduced acceleration took over forcing me to pull over on the side of the road. The GMC dealership said to bring it in again but they could not reproduce the malfunction after driving for a week. It happens randomly. The third time this happened I was traveling up interstate 24 at about 70 mph. There were semi trucks around me when the malfunction happened and my acceleration and speed was reduced throwing the RPMs as high as they would go, and I was almost hit by a semi trying to move out of the way and onto the shoulder of the interstate I tried to accelerate to get out of the way of the semi truck but could not. I had to swerve over almost losing control of my truck. I informed the dealership that this had happened again and they asked me to bring it in. I did. They told me they were going to clean corrosion off of ground wires, and that should fix the problem. It did not. This keeps happening and I feel that the vehicle is not safe to drive. I do not know when it will happen again. I travel for a living and I feel the vehicle is unsafe to operate.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713245January 25, 2026
UNKNOWN OR OTHER
Tailgate is randomly dropping while driving without any tailgate drop buttons being pushed. It’s is starting to occur more frequently.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713264January 25, 2026
STRUCTURE:BODY
I was driving on the highway (using cruise control) when the front bumper grill started vibrating (so I tried to slow down) but it kept flapping and flew off before I was able to pull over. I then pulled over on the shoulder and had to walk back to retrieve it. My safety was put at risk because it could have hit my windshield and caused me to have an accident, or, it could have hit someone or another vehicle. I have it and it is available for inspection. It has not been inspected by anyone yet. There were no warning signals prior to the failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713287January 25, 2026
ENGINE
My 6.2 engine locked up and left me stranded. Had it replaced with s new engine on 10/31/2025 and I'm having problems again with it. As well as my 10 speed transmission slipping and hunting for gears
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713058January 24, 2026
ENGINE
I have a 2013 GMC 1500 with the 6.2L Engine. There was a recall on my engine when I purchased it used with 21K on the odometer. I took it in for the 5K oil change at 26K miles and the "performed the recall oil change" replacing the oil with 0W40 oil saying this should "fix the recall". At 32K miles my engine blew up on Christmas Eve 12/24/2025 and left my son and I stranded on the side of the road. I had the truck towed to the GMC dealer and they are now in the process of replacing the entire engine. I have now been without my truck for over a month because several other owners with 6.2L engines are having the same issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713060January 24, 2026
POWER TRAIN
Driving at approximately 30-35MPH merging in traffic, the transmission shuttered and went into reduced power mode. ECM reported a 747 code and valve body failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713112January 24, 2026
ELECTRICAL SYSTEM, POWER TRAIN, ENGINE
My TAILGATE kept opening randomly and ENGINE WAS MAKING CLUNKING SOUND initially. Lost many tools on the highway once when it opened. Dealership told me my truck is not covered under a recall for both issues, even though other similar vehicles are. I refused to pay anything to have it fixed. They claimed my truck “wasn’t built in the factory that has recalls”. A month later the STARTER AND BATTERY burned up when I started up the truck, something locked up it sounded like. Eventually it started but didn’t sound right. A few days later the engine finally blew up. I paid out of pocket for everything for that trip. It’s currently back at the dealer being repaired with a new engine for the recall but GMC refuses to pay for the initial clunking/starter/battery and the tailgate issues. I’ve encored so many charges with tows and rentals from all these issues. I would like full reimbursement for everything.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713119January 24, 2026
UNKNOWN OR OTHER
Onstar module is not working
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712841January 23, 2026
STRUCTURE:BODY
I was driving on the interstate when the hood deflector blew off suddenly and unexpectedly damaging my hood and hitting the windshield. This vehicle was recalled for this part defect last year and the fix was applied by the dealer. It appears that some sort of adhesive was applied to the retainers but they still ultimately failed. This was a very dangerous situation that could have ultimately caused an accident. I am reporting this so that the approved repair can be reviewed. This part should have been replaced, not simply placing adhesive on the defective part. The past safety recall # was N242490120.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712853January 23, 2026
ELECTRICAL SYSTEM, ENGINE
My truck is affected by GM’s engine block‑heater safety recall (NHTSA 21V‑496 / GM N212329840) addressing a risk of short circuit and potential engine‑compartment fire at the heater cord/terminal connection. GM’s interim action has been to remove/disable the block‑heater cord, which my dealer did, and then marked the recall “completed.” As a result, the NHTSA VIN tool shows 0 unrepaired recalls, even though no actual repair/restored functionality exists and GM continues to advise owners not to use the block heater until parts are available. Safety concern / impact: I live in a cold‑weather area and purchased this diesel expecting a functioning block heater for reliable cold starts. Disabling the heater has removed an intended cold‑weather safety/starting aid for multiple winters without a final fix. GM’s bulletin explicitly allowed dealers to disable the cord to close the recall, rather than provide a repair, leaving owners without the feature indefinitely. Suspiciously, I have also had to replace glow plugs on this truck sooner than traditional wear / failure rates would demand - including one glow plug that has been replaced twice in short span of time (should have lasted years). I continue to monitor GM’s recall portal; still no parts/remedy schedule. Please review whether GM’s chosen remedy—disabling a safety‑related feature and closing the recall—is adequate and within a reasonable time under the Safety Act. If not, I request NHTSA open a Recall Query into remedy adequacy and timeliness so owners receive a real repair (replacement heater/cord/connector) or appropriate alternative remedies.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712861January 23, 2026
ENGINE, FUEL/PROPULSION SYSTEM
My vehicle recently experienced a sudden flashing check engine light, severe misfiring, and rough engine operation, creating an unsafe driving condition. An inspection by an authorized GMC dealership, Serra Buick GMC Champaign, confirmed a failed deactivating valve lifter on Cylinder 5, documenting that the lifter ceased movement after a single engine rotation. The dealership advised that the failure necessitates replacement of all lifters and extensive internal engine components, at an estimated cost of $5,650.75. This defect is not isolated, unforeseeable, or the result of consumer misuse. It is directly associated with General Motors’ Active Fuel Management (AFM) system, which has been widely reported to cause: •Premature lifter collapse •Camshaft damage •Severe engine misfires •Loss of power while driving •Catastrophic engine failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712899January 23, 2026
SERVICE BRAKES, ENGINE
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, the braking system had erroneously activated, causing the vehicle to abruptly stop in the middle of the road. The vehicle was towed to the local dealer, who diagnosed that the failure was caused by an engine malfunction of the number six cylinder. The vehicle was repaired. No further information was available. After retrieving the vehicle, the contact was driving approximately 10 MPH when the failure reoccurred and the braking system erroneously activated, causing the vehicle to abruptly stop. During the incident, the driver's head slammed into the steering wheel, causing a head laceration. No medical treatment was required. The vehicle was towed back to the dealer. The cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 120,000.
Crash:
No
Fire:
No
Injuries:
1
Deaths:
0
#11712904January 23, 2026
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, LANE DEPARTURE: ASSIST
GMC SUPER CRUISE MALFUNCTION NO WARNING BEFORE SUPERCRUISE SHUTS OFF PASSING A CAR ON FOUR LANE HIGHWAY (SUPER CRUISE ENABLED) SUPER CRUISE SHUT OFF AND TRUCK CONTINUED HEADING FOR THE CENTER GAURD RAIL.(I CAUGHT IT BEFORE IT BECAME AN INCIDENT). SUPER CRUISE ABRUPTLY SHUTS OFF (NO WARNING) AND WITHIN A COUPLE THOUSAND FEET IT TURNS ON. MY FIRST TIME USING SUPERCRUISE AZ HIGHWAY 87 N BOUND JUST BEFORE RYE AND AZ HIGHWAY 260 BETWEEN PAYSON AND CHRISTOPHER CREEK I CALLED MY DEALERSHIP BUT IT WAS LIKE UH HUH OK I'LL LET GM KNOW.- NO SUPPORT! THE ONLY INDICATOR IS ON THE STEERING WHEEL A RED,GREEN OR YELLOW LIGHT.RED IS OFF-GREEN IS ACTIVE, AND YELLOW LIGHT NO SERVICE. RED LIGHT COMES ON AND SEAT VIBRATES SUPERCRUISE DROPS OUT.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712927January 23, 2026
STRUCTURE:BODY, UNKNOWN OR OTHER
i was driving down the road the front piece of the grill flew off the truck and hit my windshield, then flew into oncoming traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712965January 23, 2026
ENGINE, POWER TRAIN
I heard a loud metallic knock that was not consistent with normal engine noise. I noticed the oil pressure was on the lower end of the scale but not abnormal based on how it is displayed. I decided to take the vehicle to the dealer ASAP for an oil change (that was coming due) and discuss with them. I drove roughly 20 miles from start of noise until delivery at the dealer. The truck gave me a "Reduced Acceleration, drive with caution" message 10 miles prior to the dealership but no associated lights, engine codes, check engine light or associated alerts on the myGMC app. Dealership found oil pressure ranging between 4-8 psi, and a failed oil pressure control solenoid, heavy metal debris in the oil pan including parts of the thrust bearing and oil squirter. Entire engine and turbo replacement was required. Truck had 143 hours on the engine and 6,300 miles. It was produced in August of 2025 with a purchase date of 17 October 2025. Produced: 8/25 Purchased: 10/17/25 Failed: 12/30/2025 Returned with new Engine: 1/23/26
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712976January 23, 2026
ELECTRICAL SYSTEM, VISIBILITY/WIPER, UNKNOWN OR OTHER
Back window leaks down onto electrical compents and causes mold behind rear seat, plus staining mold on headliner
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712775January 22, 2026
ENGINE
The engine seized up traveling about 40MPH in the middle lane on a busy road with my child in the passenger seat. I was able to get off the busy road but part of my truck was still intruding into the lane. The truck is parked at my house. The vehicle has not been inspected by anyone and is still in the same condition as the day the engine seized. The only thing that indicted any issue was a couple popping noises right before the engine seized. It all happened while I was driving in traffic and I did not notice any indications on dash. I was more concerned about getting off the road and out of traffic before I got rear-ended or involved in a pile up.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11712819January 22, 2026
POWER TRAIN, ENGINE, FUEL/PROPULSION SYSTEM
On the afternoon of 01/20/26, I was merging onto the highway in my 2021 GMC Sierra 1500 when a loud bang was heard from the engine compartment at approximately 60 mph. Immediately after the ban was heard, several indicator lights on the dashboard were illuminated, including the ESC, check engine light, and parking brake light. A power loss was felt when attempting to accelerate and the banging noise worsened anytime the accelerator was depressed. I was able to drive the vehicle to the nearest GM dealership that coincidentally was at the closest exit off of the highway I was traveling on. The dealership performed diagnostic and determined that the damage was caused due to the ongoing GM recall associated with Safety Recall N252494000. My vehicle had previously been inspected as part of the recall and was found to have passed. Vehicle had been driven approximately 4,000 miles after recall was performed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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