GMC Sierra Complaints (2023)

567 consumer complaints on file.

#11717129February 10, 2026
ENGINE
My truck supposedly passed the initial recall for the 6.2L GM engines. AT THIS TIME THEY CHANGED THE OIL AND SAID THE ENGINE WAS FINE! 5 months and one oil change (performed at the same GM dealership using the new recommended oil) my engine seized up while driving approximately 55 mph in rush hour traffic. The engine made a banging and clanging noise and lost power approximately 1/4 miles after the initial noise. This almost caused two accidents as the traffic had to come to a sudden stop, That’s engines are extremely dangerous to both the owners and the driving public on the highways alongside them. p the failure of the engine put me in a highly dangerous situation. This “oil” Fix is not doing what GM is saying it will do. I was told yesterday that my vehicle will need a new engine and radiator. This is simply dangerous and it makes for a horrible financial situation with the truck already needing a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11716565February 8, 2026
UNKNOWN OR OTHER
The vehicle camera camera system is sometimes not available at startup and will not reset until the vehicle is allowed to sit for several hours. This prevents the backup camera, forward camera and side mirror cameras from providing an in-dash video of vehicle surroundings, which is especially critical for reversing direction or backing-up. Typically the camera will reset after sitting from a period of time. I have reported it to the dealer, but their position has been that since camera has always been working when I bring the truck in for service, is that there is really nothing they can do to correct the intermittent issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715791February 5, 2026
ENGINE
On or about Tuesday, February 3, 2026 at 12:20 CST, at the Chevrolet Dealership in Libertyville, IL; I presented my 2023 GMC Sierra to “Manny” at said dealership due to the vehicle INSTRUCTING ME TO DO SO because of DTC codes displayed indicating a failed DEF tank. I was told a technician would be able to diagnose the vehicle that afternoon. MakeModelYearVIN GMCSierra2023 [XXX] Day 1: came and went with no contact from the service department as promised. Day 2: Wednesday, February 4 came with – again – no follow-up from the dealer. When I CALLED I was told there were “no notes in the service order” and “the tech has gone home.” Day 3: Thursday morning “Manny” called to tell me nothing was done and nothing could be done. I was told to “call GM” and complain about my problem. This is how GM treats its customers. This is how GM treats its REPEAT customers. This is how GM treats its customers who BUY THEIR EXTENDED WARRANTIES. 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
#11715606February 4, 2026
ELECTRICAL SYSTEM, ENGINE, FUEL/PROPULSION SYSTEM
I was driving on an overpass and suddenly loss propulsion in my vehicle. My vehicle stopped all of a sudden and while driving, leaving me stranded in the middle of the roadway blocking traffic. Numerous motorists stopped to give a hand but the vehicle would not switch gears from PARK, to neutral to even give me a hand moving the vehicle out of the roadway to the side/shoulder. Due to this issue, authorities were dispatched to my location to conduct traffic control and subsequently called in aide of a tow truck to safely move my vehicle to a better location. I used OnStar in my vehicle and also spoke with a representative who notated the incident and I was advised that a tow truck would take approximately 90 mins to 2 hours to reach me. In this instance, that was too long of a wait for events going wrong with the vehicle itself and was subsequently transferred from the roadway to a GMC dealership, namely Group 1 South on the Gulf Freeway. They are handling my repairs and have diagnosed that the engine needs to be completely replaced and are in the process of repairs. If any information is needed regarding status or repairs, please contact the dealership directly as I do not have any physical or written information on the status of my vehicle. Attached is the towing receipt.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714981February 2, 2026
ELECTRICAL SYSTEM, ENGINE, FUEL/PROPULSION SYSTEM
Engine shut off on the interstate with no warning. Would not re-start. Forced to cross lanes on traffic with no engine power or power steering. Dealer stated it was the "Fuel Pump Control Module." Stated it was a common issue with parts most likely in stock, but it would be at least 6 weeks before they could even look at the vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714986February 2, 2026
ENGINE
Engine losing 60% to 50% of its oil capacity at 5000-6000 miles with 40-50% life left in the vehicles built in maintenance minder. This has been a trend since 25,000 miles. By this math, vehicle would have minimal oil, if any at all, when vehicle says service is due. Creates a high probability for catastrophic failure at speed and increases smoke / condensation from the exhaust in colder weather. Dealer states this is a common problem, manufacture has adjusted their oil consumption standards to make this a "normal" amount despite the risk of failure and injury at speed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714987February 2, 2026
ELECTRICAL SYSTEM, LANE DEPARTURE: ASSIST
Vehicle will show lane keep assist system as active but provide no intervention and allow vehicle to travel into the next lane intermittently. System will also move itself to the next lane unexpectedly when near the lane markers of the original lane. Navigation system and radio will freeze, stop working all together, and at times fully reboot, randomly while in operation. While these issues are frequent, they are intermittent. No repair suggestions by dealer or manufacturer
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11715117February 2, 2026
ELECTRICAL SYSTEM
The contact owned a 2023 GMC Sierra 1500. The contact stated that while the vehicle was parked on the driveway, it caught on fire. The contact was inside the residence when a passerby knocked on the door and informed the contact of the fire. A neighbor helped extinguish the fire. When the contact stepped outside, the flames were by the instrument panel; the flames had risen to the rooftop. The front windshield was shattered. The fire was contained to the cabin. The fire department was called. The contact stated that weeks before the fire started, an abnormal sound could be heard coming from the engine. The contact removed the battery from the vehicle. The vehicle was not insured. The manufacturer was not made aware of the failure. The failure mileage was unknown.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11715151February 2, 2026
POWER TRAIN, ENGINE, VEHICLE SPEED CONTROL
The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle shuddered while in first gear. The contact stated that the transmission sounded strained and shifted rough before slamming into gear. The vehicle was taken to the dealer; however, no cause for the failure was found. The dealer diagnosed the vehicle and determined that the vehicle was oversteering while turning to the right. The dealer replaced the valve and torque converter. On another occasion, while driving at an undisclosed speed, the vehicle accelerated independently. Most recently, a burned transmission fluid odor was coming from the front of the vehicle and entered the cabin through the A/C vents. There oil stains found on the ground on several occasions. The vehicle was taken back to the dealer and the valve body was replaced, the fluid levels were checked, and the transmission filter was replaced; however, the failure persisted. The contact called the dealer, and the dealer towed the vehicle. The dealer determined that the oil cap was loose. The vehicle remained at the dealer unrepaired. The manufacturer was made aware of the failure, and a case was opened. The failure mileage was 8,496.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714748February 1, 2026
ENGINE
My 2023 GMC Sierra Denali experienced a catastrophic engine failure even after receiving the official recall repair. The recall remedy did not prevent engine failure. This raises serious concerns about the effectiveness of the recall fix, especially given reports that NHTSA is evaluating this recall’s efficacy. I was stranded on a hill and this was a very dangerous situation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714126January 29, 2026
POWER TRAIN
The contact owns a 2023 GMC Sierra 1500. The contact stated that when the vehicle was started and shifted into drive(D), the accelerator pedal was depressed, and the vehicle responded slowly. While driving at an undisclosed speed, the vehicle decelerated and stopped unintendedly. The "Parking Brake” warning light illuminated. The contact stated that once the vehicle had warmed up, the unintended stopping ceased. The contact stated that the failure was intermittent at first but had become a recurring failure. The vehicle was taken to a local dealer where it was diagnosed and determined that the valve body needed to be replaced; however, the part to complete the repair was on a national back order. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 60,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714188January 29, 2026
POWER TRAIN
Vehicle: 2023 GMC [MODEL], Black Widow package, 6.2L L87, 41,078 miles Recall: 25V‑274 / GM [XXX] ; recall remedy performed by Marty’s GMC (Kingston, MA) on 2025 -11-12; oil changed per recall procedure Post‑remedy symptom: intermittent knock starting ~01 - 2025 / about two months after remedy Incident: Jan 23, 2026 — engine seized / loss of propulsion while driving; stranded on highway off‑ramp; vehicle impeding traffic causing dangerous conditions. Codes: OBD scan by passerby indicated camshaft position sensor / correlation error (exact code not captured) Crash/Injuries: none Current status: vehicle at Marty’s GMC since Jan 23; not diagnosed as of Jan 29; GMC case #88159466 Safety concern: sudden loss of motor power in traffic after recall remedy On Friday, Jan 23, 2026, while my daughter was driving, the engine seized / the vehicle lost propulsion and stranded her on a highway off‑ramp. The vehicle was impeding traffic and had to be moved. It restarted briefly and was moved to a safer location but still impeding traffic. A motorist scanned the OBD port and reported a camshaft position sensor / cam-crank correlation error (exact DTC unknown). No crash occurred and no injuries occurred. The vehicle has been at Marty’s GMC since Jan 23, 2026 and as of Jan 29, 2026 it has not yet been diagnosed. I opened a case with GMC Customer Assistance (case #XXX). This is a safety-related loss-of-propulsion event occurring after the recall remedy was completed. 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
#11713963January 28, 2026
ENGINE AND ENGINE COOLING, POWER TRAIN
The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving uphill, the vehicle unexpectedly lost motive power. There was no warning light illuminated. The vehicle failed to restart and was towed to the dealer, where it was diagnosed, and determined that the engine block had failed and needed to be replaced. The vehicle was repaired. The contact stated that later, while driving at an undisclosed speed, the vehicle failed to shift into gear properly and jerked abnormally. There was no warning light illuminated. The vehicle was returned to the dealer and was diagnosed with transmission failure, requiring the PCM/TCM to be reprogrammed. The vehicle was repaired. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated, and the vehicle was taken back to the dealer, where it was diagnosed and determined that the fuel injector and coolant pump had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure, and a case was opened. The approximate failure mileage was 57,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714043January 28, 2026
STEERING
Loss of power steering while driving
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11714077January 28, 2026
ENGINE, FUEL/PROPULSION SYSTEM, UNKNOWN OR OTHER
I was driving in the high way and the vehicle started having issues and then it completely shut off and wouldn’t drive or anything in the middle of the highway and the dash said it was reducing power.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713557January 27, 2026
ENGINE
I was driving on the Oklahoma turnpike @ 75mph when the engine locked up in traffic. I coasted to the side of the road and called roadside assistance. The truck is currently at Vance GMC in Miami, OK getting the engine replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713638January 27, 2026
ENGINE
2023 GMC SIERRA DENALI ULTIMATE 1500 WITH 6.2 V8 AT HIGHWAY SPEEDS 65 MPH THE CAR LOST PROPULSION AND SAID IT WAS IN NEUTRAL. CAR WOULDN'T SHIFT BACK INTO DRIVE. BARELY MADE IT OFF THE HIGHWAY WITHOUT AN ACCIDENT. CAR WOULDN'T RESTART. CAR BROUGHT TO DEALERSHIP AND WAS TOLD IT NEEDS A NEW ENGINE AND I WOULD BE WITHOUT MY TRUCK FOR A MONTH. CAR CURRENTLY HAS 20,200 MILES ON IT. PLUS NO LOANER CAR. GMC HAS TERRIBLE CUSTOMER SERVICE AND SELLS A DANGEROUS PRODUCT
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11713333January 26, 2026
POWER TRAIN
I am writing to formally file a safety complaint regarding the ongoing recall of the GMC/Chevrolet 6.2-liter V8 engine and what I believe to be an inadequate and insufficient remedy being provided to vehicle owners. I purchased a brand-new 2023 GMC Sierra AT4 equipped with the 6.2-liter engine. I drive approximately 6,000 miles per year and maintain the vehicle carefully. After receiving the recall notice, I promptly took my truck to an authorized GMC dealership for inspection and repair. The only action taken was an oil change to a heavier-weight oil. I was told that everything was “fine” and that no further action was required. I find this remedy unacceptable given the severity and nature of the reported failures associated with this engine platform. Simply changing to a heavier oil does not address the underlying mechanical risks and does not provide owners with meaningful assurance that catastrophic engine failure will not occur without warning. This issue is particularly serious for me because I rely on my vehicle for my livelihood. I am an account sales executive and use this truck extensively for work travel and customer meetings. If my vehicle were to fail unexpectedly, it could cause me to miss critical business meetings, resulting in immediate financial loss and potentially long-term damage to customer relationships and sales performance. The current remedy provides no confidence that such a scenario will not occur. In addition, this recall has materially harmed the resale and trade-in value of my vehicle. Dealerships are now significantly lowballing trade-in offers because the 6.2-liter engine recall is widely known and prospective buyers are reluctant to purchase these vehicles. Buyers are also aware that any future owner will not receive the benefit of the original powertrain warranty coverage in the same way, further depressing resale value. As a result, I am effectively trapped in a nearly new vehicle that has become difficult to sell or trade due
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

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