GMC Sierra Complaints

15,732 consumer complaints on file.

#11726850March 24, 2026
UNKNOWN OR OTHER, STRUCTURE:EXTERIOR TRIM
I was driving on the highway at about 80 miles per hour and all of the sudden, a piece of the front grill detached and flew off, hitting the top of the of the roof.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726877March 24, 2026
ENGINE
My engine started knocking horribly, I need to get a proper diagnosis but cannot afford to have a shop look at it. I have been building engines my entire life and am certain the rod bearings have failed. The engine has a distinct knock under acceleration, you can hear it clearly when pulling away from a stop sign for example.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726248March 23, 2026
POWER TRAIN
I've been to the dealership a few times due to the truck jerking violently under very light acceleration when its trying to shift gears. also there was a few times that the rear wheels have locked up while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726286March 23, 2026
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:UREA INJECTION SYSTEM (DEF), VEHICLE SPEED CONTROL
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at 65 MPH, the DEF tank failed. The vehicle went into three phases of LIMP Mode and the vehicle unexpectedly decelerated while driving. The DEF system service message was displayed. The vehicle was taken to the local dealer, where it was diagnosed with DEF tank failure, and the tank needed to be replaced, even though the tank was full. The part was on backorder for several weeks. The contact was not provided with a loaner. The vehicle was repaired. The manufacturer was contacted and opened a case, but no additional assistance was provided. The failure mileage was approximately 70,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726316March 23, 2026
STRUCTURE:BODY, SUSPENSION
Truck started to make loud clunking noise when driving taken it to two shops and wrong parts were installed as stated below. Bought from a used car dealership and they sold it as is now with the wrong parts.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726320March 23, 2026
STRUCTURE:BODY
Bad paint used by manufacturers that causes frames to rust out.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726343March 23, 2026
ENGINE
L87 engine failure 4 months after it passed the recall test. Experienced shuddering and rpm fluctuation with the cruise control set. Was thinking torque converter. Got it replaced under warranty and the the issues were still there. A week after new TC the truck was running very rough driving down the road. Check engine light along with a low oil Pressure warning and Lost all engine power going 60mph. Would not re fire. Had to coast to a stop with no headlights on only fog lights. Truck is at dealership now will be needing a new engine. P0016 engine code. The truck was in the shop multiple times for misfire and rpm’s jumping and cruise control turning off on its own.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726349March 23, 2026
ENGINE AND ENGINE COOLING, ENGINE
The contact owns a 2020 GMC Sierra 1500. The contact stated that the vehicle made an abnormal sound while idling. There was no warning light illuminated. The vehicle was taken to the dealer, where the engine was disassembled, and the dealer determined that the crankshaft and the thrust bearings had failed. The vehicle was repaired. The contact related the failure to NHTSA Action Number: EA25007 (Engine, Engine and Engine Cooling). The manufacturer was notified of the failure and partially covered the repair cost. The failure mileage was 60,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726395March 23, 2026
ENGINE
Based on the critical recall and safety concerns for this known issue for the 6.2 L87 Engine failure I am highly concerned that it takes over 171 days to just get an appointment to look at this issue. This is further compounded by the fact I put approx 800-1000 miles a week on my truck and now am worried about having an accident or blowing my truck up.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726399March 23, 2026
SEAT BELTS
I was driving down the highway at 70 mph, when there was a loud bang followed by a gun powder smell. My seatbelts went tight...hazard lights automatically came on...radio went dead...and the Airbag light came on. The pretensioners in both driver and passenger seats had deployed. I pulled over and shut the truck off, to get out and inspect it. There was no warning, and luckily I was composed enough to not wreck into anyone or anything. I see there have been a few similar incidents, so I'm glad this isn't just a solitary incident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726497March 23, 2026
STRUCTURE:BODY
The top part of the front grille fell off while driving
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726517March 23, 2026
TIRES:SIDEWALL
I am reporting a potential safety defect involving Goodyear Wrangler TrailRunner AT tires size LT275/65R20. I purchased a new 2025 GMC Sierra 3500HD in August 2025. By the time the vehicle reached approximately 1,800 miles, noticeable sidewall bulges appeared on both rear tires. As a 36-year automotive professional, I recognized the serious safety risk posed by this condition and replaced all four tires at my own expense with a different brand. Since then, I have seen multiple reports of similar sidewall failures on brand-new trucks, which suggests this may be a systemic issue. Based on my experience and these reports, I believe this defect may be known to both Goodyear and GM but has not been adequately addressed. I urge the National Highway Traffic Safety Administration (NHTSA) to investigate this matter to determine whether these tires pose a significant safety risk to the public. Vehicle Information: Make & Model: 2025 GMC Sierra 3500HD Tire Model: Goodyear Wrangler TrailRunner AT tire size LT275/65R20. Mileage at Issue: ~1,800 miles Purchase Date: August 2025 Summary of Issue: Sidewall bulging on new tires, potential for blowout or loss of vehicle control.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726558March 23, 2026
ELECTRICAL SYSTEM
The rear vision safety camera failed. A Red Triangle with a camera icon appeared on the infotainment screen when the vehicle was put in reverse. After testing and diagnosing the issue, the dealership determined that the rear camera suffered an internal failure and had to be replaced. The part was replaced on 3/23/26 but the dealership did not give me the failed camera back. There was no advance notice or warning leading up to the failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726573March 23, 2026
ENGINE
MY 2026 GMC Sierra AT4 1500 6.2 L87 engine had a catastrophic failure with only 3347 miles. It stalled twice while driving home, when pulling into my driveway it stalled a third time and would not start after that. Before having my vehicle towed to the Dealer from my home I connected my code reader and it posted code P0016. After being diagnosed by the dealer they informed me I needed an entire new engine. There were no warning lights or message prior to this failure My vehicle was purchased 9 week prior.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726576March 23, 2026
VISIBILITY/WIPER, STRUCTURE:BODY, UNKNOWN OR OTHER
The frame of the back window is cracking allowing water to come in through the back glass. This is causing the headliner and other components such as air bags and other electrical components to get wet and damaged. This could cause risk of fire or failure of safety components within the vehicle such as air bags, cameras and other sensors. With water intrusion comes the high risk for mold to develop and cause serious health risks. GMC is aware of this issue and will not agree to repair it. A GMC dealer has inspected the glass and said it was a faulty seal but since it's not in the 3 year warranty window, it's not covered. Independent auto glass companies state they have seen this issue many times and the glass seal is faulty. GMC should do the right thing and fix this issue. This devalues the vehicle and the GMC brand and poses serious risks to driver. I have created a case with GMC and submitted photos, videos and dealership estimates for proof.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726126March 22, 2026
ENGINE, FUEL/PROPULSION SYSTEM
The failure involved the engine (6.2L L87 V8), specifically suspected internal components such as the crankshaft and/or connecting rods, as identified in a current recall. The vehicle is currently located at Dennis GM in Corner Brook, Newfoundland and is available for inspection. On March 9, while driving the vehicle normally on a main highway, the engine suddenly lost all power without warning. The accelerator became completely unresponsive and the vehicle rolled to a stop in the middle of a main highway. The engine would not restart. Due to the electronic gear selector, the vehicle could not be shifted into neutral, leaving both the truck and trailer immobilized in a live traffic lane. This created a serious safety risk to myself and other motorists, especially as I was in an area without cellular service and could not immediately call for assistance. The problem has not yet been formally diagnosed, as the vehicle remains at the dealership awaiting inspection. However, the symptoms are consistent with known failures described in the recall affecting these engines. The vehicle had previously undergone recall inspection on September 1, 2025 and was cleared at that time. The vehicle has been inspected previously by an authorized GM dealer as part of the recall process, but no defect was identified. It has since been towed to Dennis GM following the failure and is pending further inspection. No police or insurance inspections have been conducted. There were no warning lights, messages, or prior symptoms before the failure. The engine failure was sudden and without any indication of an issue beforehand.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726153March 22, 2026
LANE DEPARTURE: BLIND SPOT DETECTION
I am reporting a safety-related defect involving the blind zone alert system. The system failed repeatedly and required multiple service visits. Initial repairs did not resolve the issue. The dealership ultimately determined the cause to be a faulty wiring harness, which has now been replaced and appears to have corrected the issue. Safety Concern: Failure of a critical safety system Increased risk during lane changes Issue persisted across multiple repair attempts Additional Concern: The delay in identifying the defect required multiple service visits and resulted in significant out-of-pocket costs. Request: Investigation into: Wiring harness defects affecting safety systems Reliability of blind zone monitoring systems
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726192March 22, 2026
ENGINE
Lifter failure and camshaft failure twice
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726209March 22, 2026
ENGINE
I am filing a complaint regarding a catastrophic engine failure in my 2021 GMC Sierra 1500 equipped with the 6.2L V8 engine. While driving under normal conditions, the engine suddenly failed without warning and threw a connecting rod, rendering the vehicle inoperable. There were no prior warning signs such as knocking, overheating, oil pressure issues or even a check engine light. The vehicle has been properly maintained, including regular oil changes using manufacturer-recommended 0W-40 oil. This failure created a serious safety concern due to the sudden loss of power while driving, which could have resulted in a dangerous situation, especially at highway speeds or in traffic. I am aware that General Motors has issued a recall and/or is aware of similar failures involving the 6.2L engine in certain 2021 vehicles. However, my vehicle’s build date falls just outside the currently defined recall range, despite experiencing the exact same type of catastrophic failure described in those cases. My build date is 12/20 and the recall was issued for 3/21. Given the similarity of this failure to known issues, I believe this defect extends beyond the currently identified recall population. This raises concerns that additional vehicles, including mine, are at risk of sudden engine failure without warning. I am requesting that National Highway Traffic Safety Administration investigate this issue further and consider expanding the recall to include additional affected vehicles outside the current build date range.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726088March 21, 2026
ENGINE
To the best of my knowledge… My 2020 GMC Sierra Denali with a 6.2L engine and 74,000 miles had a complete engine replacement. One lifter on bank 2 was stuck, and the push rod in the cylinder was bent. The engine made a popping noise when starting. I took it to a GM dealership, where they quoted $9,200 to repair the issue or $9,600 for a brand-new engine with a 3-year/100,000-mile warranty. I know there is open recalls for 21’-24’ Models, but I would like some help with mine. This kind of problem shouldn’t happen on a GMC - loaded truck with only 74,000 miles. Thank you!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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