GMC Sierra Complaints

15,732 consumer complaints on file.

#11761659September 2, 2026
ENGINE
XXX Pulling into Mason Park - Truck Shot down while driving. Went into Park (immediate stop) 2 of my Kids were in the truck at the time. Restarted truck and loud Noises. Immediately backed into parking space shut down and towed. Sent to dealership XXX Called spoke co/ Mark. [XXX] had tech. look at truck. expressed My concerns and Should Never occurred @ 6788 miles. Expressed Something Needs done. Recommend contact GMc. - Call GMC, Crated a Case #XXX. Engine replaced after 2 months. No one checked the transmission or had explained why it went into park while in operation.Refused to look at any other concerns. 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
#11761681September 2, 2026
ENGINE
engine failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761682September 2, 2026
STRUCTURE:BODY
The piece in front of the hood detached and flew off while riding down the highway.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761693September 2, 2026
STRUCTURE:BODY
while driving my 2023 GMC Sierra AT4 at highway speed, the front grille piece (GM part 84957848, roughly 3 feet or longer) detached from the vehicle without warning and flew off into the roadway. The piece landed on the shoulder rather than in a travel lane, but given its size, it could easily have struck another vehicle or caused a serious accident if it had landed differently. I was then forced to stop on the highway shoulder to retrieve the part, which put me in an unsafe roadside situation with traffic passing at highway speed. This part had all its retaining clips still intact, indicating a failure of the part/mounting itself rather than a missing clip or improper installation. part number 86274905
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761746September 2, 2026
UNKNOWN OR OTHER
Safety Complaint – 2025 GMC Sierra 1500 Tailgate While driving our 2025 GMC Sierra 1500 and towing a trailer, the tailgate unexpectedly opened and dropped down while the vehicle was in motion. No one touched the tailgate button, key fob, or any other controls to activate the tailgate. We were unaware that the tailgate had opened. When we made a turn, the trailer contacted the tailgate and crushed/damaged it. This occurred without any intentional activation of the tailgate release. We believe this presents a significant safety concern because an unexpectedly opening tailgate while driving, especially while towing a trailer, could result in property damage, loss of cargo, or a more serious accident. We are requesting that this issue be investigated to determine whether there is a defect with the tailgate latch, release mechanism, or electronic controls on the 2025 GMC Sierra 1500.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761755September 2, 2026
ENGINE, POWER TRAIN
I am reporting a serious safety concern involving a 2023 GMC Sierra 1500 Denali, 6.2L L87 V8, VIN [XXX]. This vehicle has now experienced two catastrophic powertrain failures at very low mileage. The first catastrophic engine failure occurred at approximately 23,696 miles. The vehicle was taken to a GMC dealer, where the repair documentation states that the engine had suffered significant internal damage, including damage to the #3 connecting rod, a missing connecting-rod bearing, bearing material throughout the engine, and a scored crankshaft. The dealer determined that the engine was seized and required replacement. GM replaced the engine under warranty with GM engine assembly part number 12740076. The vehicle has now experienced a second catastrophic failure. On [XXX], while traveling approximately 40 mph, experienced grinding, lurching, and knocking, followed by a complete loss of propulsion. The truck would no longer move and had to be towed to a GMC dealer. At the time of the incident, no warning lights or warning messages were observed. The transmission is also suspected to have failed, although the exact cause and extent of the transmission failure have not yet been determined by the dealer. I understand that NHTSA is currently investigating failures involving GM 6.2L L87 engines, including failures occurring after previous recall remedies and engine replacements. I am therefore requesting that this incident be included in NHTSA’s investigation and considered when evaluating the effectiveness of the existing recall remedy and the safety of replacement L87 engines. 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
#11761210September 1, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2022 GMC Sierra 1500. The contact stated that while driving approximately 65 MPH, the transmission shifted to neutral(N), and the contact was unable to control the vehicle. The vehicle was coasted to the side of the road, and the transmission failed shift into park(P), reverse(R), or drive(D). The message "Conditions no Longer Exist for Driving," was displayed on the screen. The vehicle was towed to the dealer and was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The contact was informed that the nuts were welded to the engine, causing a failure with the engine overheating. The failure also occurred while driving 65 MPH, and the transmission shifted into neutral with the same message displayed on the screen. The vehicle was towed back to the dealer, and it was diagnosed with engine failure. The contact stated that the engine was replaced. The dealer informed the manufacturer of the failure. The failure mileage was approximately 34,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761258September 1, 2026
POWER TRAIN
While driving truck jolts (rear wheels lock up) then downshifts into a lower gear. Appears to be similar issue as described in Recall 24V797 and 25V148. Not sure why my VIN does not show up on recall. Based on description it is the same problem. Feels unsafe to drive.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761267September 1, 2026
ENGINE AND ENGINE COOLING
See attached document for complaint.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761294September 1, 2026
ENGINE
On 06/26/26, I was driving my 2024 GMC Sierra 1500 AT4 with 6.2 engine (Aug. 2024 engine build date) with 27,614 miles down the highway at 60-65mph and my RPMs started jumping and I lost engine power and received this P0016 error message. I was able to coast off the highway at the next exit but this put me and my family at risk. Once I was able to coast into a parking lot, my truck wouldn't start anymore. My dealer picked up my truck and the engine was on backorder and then was replaced and I got the truck back on 08/21/26.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761311September 1, 2026
ENGINE
My truck is a 2019 6.2 motor GMC it fell outside of the motor recall. On May 23, 2026, I had a catastrophic engine failure. GM would not cover any costs associated with the engine replacement. I have a photo of the failed lifter. This issue is a problem with GM and its active fuel management system. GM knew about the issue and put the engine into service.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761314September 1, 2026
ENGINE, FUEL/PROPULSION SYSTEM
Transmission stopped at 29,000 miles, engine died and was replaced at 32,000 miles
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761343September 1, 2026
POWER TRAIN
Automatic Transmission not shifting properly unable to accelerate bangs gears while shifting noises from the transmission not reported no warning lamps
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761354September 1, 2026
ENGINE
While driving, my 2023 GMC Sierra with the L87 6.2L engine experienced a sudden, complete, catastrophic loss of engine power. There were no warning lights or messages prior to the failure. This was a one-time event, but it left the truck inoperable and I have been without the vehicle since it happened. The vehicle had recently passed applicable recall checks and had a routine oil change performed, so it was properly maintained leading up to the failure. A sudden loss of engine power while driving poses a serious safety risk, including the possibility of a collision if it happens in traffic or at highway speed. It is unknown whether a dealer has confirmed the root cause, as the vehicle has been out of service since the incident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761398September 1, 2026
STEERING:HYDRAULIC POWER ASSIST:POWER STEERING FLUID, SERVICE BRAKES, HYDRAULIC
The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving 5 MPH, the vehicle lost brake and power steering functionality, and there was smoke coming from underneath the hood. The contact stated that power steering fluid was leaking onto the engine. No warning lights were illuminated. The vehicle was towed to a local dealer, where it was diagnosed, and the contact was informed that the power steering pump had seized, the belt and hoses had failed, and the parts needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 40,832.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761404September 1, 2026
ENGINE, FORWARD COLLISION AVOIDANCE: WARNINGS, BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING
10/01/25: Vehicle brought to dealership for the 6.2L Engine Loss of Propulsion Recall. Engine Passed the Pico vibration test. Oil was changed from 0W-20 to 0W-40. Mileage was 29K. 06/17/26: Engine Seized at 43K miles. Was travelling 50 MPH up a Mtn Pass. Barely had enough momentum to roll to the right shoulder out of traffic. 07/07/26: New motor installed. Back to 0W/20 oil. Since ownership, I have to on a regular basis reset the Collison Warning from Seat Vibration to Beeps. It appears to reset back from Beeps to Seat Vibration every time there is an over the air software update. It might even just randomly reset. I cant tell for sure. I recently had a small backing accident were I was expecting the Beeps to alert me. I mentioned this to my auto insurance company. They told me this was not the first time they have heard of this type of situation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761457September 1, 2026
ENGINE
Loss of power, had engine repaired, replaced passenger side head and cylinder. Now drivers side is having the same issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761466September 1, 2026
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
I am reaching out to NHTSA due to a vehicle that I believe will get me and/or my family in a major accident and cause serious injury or death. The vehicle that I had purchased in 07/08/2025 had a clean history report and was bought at 54,587 miles. It started having issues 8,563 miles later (odometer reading 63,150 ) on a trip that was 400 miles round trip. I was driving the vehicle on a highway at 65 mph and i felt a knocking vibration in the pedal it was not long before i could even pull over when the engine throttle had completely lost power causing the vehicle to almost come to a complete stop immediately having to steer onto the shoulder. after failing with no check engine light or warning present during the use of the vehicle on the road. it was giving off high temp/engine overheating with the engine making a continuous knocking sound in the engine. It eventually seized to work completely not being able to shift into neutral to push, and had to get it towed to the dealership 204 miles away. GM had advised the dealership to replace the whole engine which they did, and that second engine had given out 678 miles later (odometer reading 63,828.) I am now on my THIRD engine and i cannot trust or rely this vehicle for saftey or transporation. i have reached out to GM to file a claim and attempt to adress this issue to try and come to a resolution, however they denied my claim and have said that i am not "eligible" for a buyback program. I am considering getting legal attorney this is very frustrating to say the least GM is a terrible manufacturer for this issue
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761471September 1, 2026
ENGINE
On 8/31/2026 at approximately 2330 hours I was driving my 6.2L Sierra home. I took a left hand turn and the engine stopped. This happened with zero warning. I attempted to restart the engine after coming to a stop and the starter clicked once and nothing happened. Had it towed to my dealership for service. I was told the engine seized and will need to be replaced. I went through the recall process earlier where I was told my engine passed inspection and the oil was replaced with heavier weight oil and I was told it was good to go.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761056August 31, 2026
STRUCTURE:BODY
On August 22, 2026, while driving my 2022 GMC Sierra westbound on State Route 84 at highway speed, with strong westerly winds of approximately 35 knots, the front passenger-side wheel-opening molding/fender flare completely detached from the vehicle without warning. The detached molding struck the passenger-side exterior mirror and narrowly missed a motorcyclist traveling behind me. This created a serious safety risk because a substantial exterior component became a projectile at highway speed and could have struck the motorcyclist or another vehicle. There were no warning lights, messages, unusual noises, or other symptoms before the failure, and there was no known collision or impact preceding the incident. I did not initially know what had detached. After arriving home and inspecting the vehicle, I discovered the entire passenger-side front wheel-opening molding was missing. The detached component was not recovered. I reported the incident to my GMC dealer, which performs my regular service and warranty work. The vehicle was inspected on August 31, 2026. The dealer declined warranty coverage but, to my knowledge, did not determine why the component detached. Afterward, I inspected the corresponding driver's-side molding and found a substantial visible gap at its leading edge between the molding and vehicle body. Comparison with other GMC Sierra vehicles of the same model showed their moldings appeared to sit substantially more flush. The vehicle and remaining molding are available for inspection, and I have photographs documenting the condition. The cause of the failure is currently UNKNOWN. I have escalated the incident to GMC Customer Assistance under Case #109189284 and requested a product-safety review. I am concerned there may be an installation, attachment, or component-retention issue that could allow these moldings to detach while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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