GMC Sierra Complaints

15,732 consumer complaints on file.

#11676427July 26, 2025
UNKNOWN OR OTHER
Frame falling apart the coating peeled off was going to clean it to recoat it but the metal is so far gone took it to a frame shop only to find out it's not drivable anymore GM have to do better with the coating for this trucks
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676099July 25, 2025
ENGINE AND ENGINE COOLING
See attached document for complaint.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676125July 25, 2025
UNKNOWN OR OTHER
The plastic frame of the rear sliding window failed. This has allowed water to enter the cabin, which can cause mold and other health issues. This seems to be a common issue with these trucks. My truck has a certified preowned warranty and GMC said they would only cover part of it. They charged me $400 as a deductible, which there should be no deductible per certified preowned warranty. I feel like GMC needs to put out an official recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676145July 25, 2025
SUSPENSION, POWER TRAIN
The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle was veering to the right or to the left and was moving upwards and downwards. Additionally, the contact stated that the vehicle was veering excessively to the left or to the right while turning. The vehicle was taken to an independent mechanic, where the front brakes were replaced, and the contact was informed that the sway bar end links were fractured due to rust. The contact stated that upon inspecting underneath the vehicle, the lower parts of the links had detached, and one of the links was flapping. The contact purchased new parts from the dealer, and the mechanic replaced the links. Additionally, the contact stated that the vehicle was experiencing hard shifts while driving from a complete stop and while coming to a stop. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 67,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676162July 25, 2025
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
I own a 2021 GMC Denali with a 6.2L V8 L87 engine and 45,500 miles. I have confirmed the presence of metal shavings in the oil and oil filter, indicating that the engine is beginning to fail. When I took the vehicle to my local dealership, I was informed that there is currently no fix for this issue and was advised to continue driving the vehicle. This poses a serious safety risk—not just to me and my family but also to others on the road. A sudden loss of power could lead to a dangerous accident, and I do not want to be responsible for something preventable that could harm innocent people. My concern is that GM is aware of this engine issue but has instructed me to keep driving the vehicle, despite the known defect. How can GM be allowed to avoid accountability for such a critical safety matter? If a fatal accident were to occur, would the responsibility fall on GM or the NHTSA for failing to act? It’s also troubling that GM continues to profit by selling new vehicles, including the 2025 models, with similar issues, all while neglecting to provide solutions for affected customers like me. I purchased this $80,000 truck in good faith, but now no dealer wants to trade or buy these trucks without me taking a significant financial loss—something GM should be responsible for. As a taxpayer, I find it unacceptable that we bailed out GM in the mid-2000s, yet they continue to disregard accountability for their actions. I urge the NHTSA to take this issue seriously. A specific deadline should be set for GM to resolve this issue, and they should face daily penalties for every day they fail to provide a fix. If no resolution is possible, full refunds should be mandated. Please address this issue promptly, as it affects real people’s safety and financial well-being every day.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676175July 25, 2025
POWER TRAIN
The contact owns a 2018 GMC Sierra 1500. The contact stated while driving approximately 70 MPH and attempting the pass another vehicle, the accelerator pedal was depressed; however, the vehicle lost motive power and decelerated unintendedly. The contact pulled over and restarted the vehicle however, the vehicle failed to accelerate above 40 MPH. The vehicle was later taken to the local dealer who diagnosed that the transmission was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was not yet contacted. The failure mileage was 81,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676219July 25, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra. The contact became aware that the VIN was included in NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The dealer was contacted and confirmed that parts were not yet available for the recall repair. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676253July 25, 2025
ENGINE AND ENGINE COOLING, ELECTRICAL SYSTEM
The contact owns a 2021 GMC Sierra 1500. The contact stated that there was an abnormal change with the RPM. There were no warning lights illuminated. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted. The dealer received an email from the manufacturer, but the verbiage was incorrect to move forward with the repair. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 39,000. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675810July 24, 2025
POWER TRAIN
While driving on the freeway, 65 MPH, I Went to accelerate as vehicle was slowing down with no response, looked at dash and noticed vehicle was in neutral, with a message saying “restart Vehicle to shift” thankfully I was able to get over a few lanes to pull over and restart vehicle. Very scary incident while on a busy early morning commute to work.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675861July 24, 2025
ENGINE
The coolant control valve (Part # 24001355) has failed. Apparently this is the case with many vehicles and GM will not/can not get replacement parts. This should be a recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675926July 24, 2025
ENGINE
P1098 Code - Coolant Control Valve on/off/on/off.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675936July 24, 2025
POWER TRAIN
The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at 60 MPH, there was an abnormal vibration coming from the steering wheel. No warning light was illuminated. A dealer was contacted. The vehicle was taken to the dealer, where it was diagnosed, and determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and transferred the contact to the NHTSA Hotline to report the failure. The approximate failure mileage was 125,326.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676005July 24, 2025
FUEL/PROPULSION SYSTEM, POWER TRAIN, ELECTRICAL SYSTEM
This is the second time in 2 days!! While driving ~35MPH the truck experienced a harsh transmission shift followed by a sudden loss of acceleration and entered shutdown mode to protect the engine. The steering became stiff, all dashboard warning lights illuminated, and a message appeared on the driver display indicating a transmission issue and advising to drive with caution. This created an extremely hazardous condition for me while driving on s busy stretch of road. I pulled onto the side of the road, came to a complete stop, shifted into park, and turned off the engine. Upon restarting the vehicle, the Check Engine Light remained on, and the transmission continued to shift abnormally at low speeds, including some noticeable shuddering. My GMC application recorded the issue and reminded me to schedule service.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676009July 24, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle stalled, lost motive power, with smoke came from the engine compartment. There was no warning light illuminated. The vehicle was towed to the residence. The contact attempted to start the vehicle and noticed a knocking sound coming from the engine with the check engine warning light illuminated. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The dealer was contacted and informed the contact that parts were not yet available. The dealer informed the contact that the vehicle had a Salvage Title and would not be repaired under the recall. The manufacturer was made aware of the failure, and a case was opened. The failure mileage was approximately 48,000. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676015July 24, 2025
SERVICE BRAKES, ENGINE, FUEL/PROPULSION SYSTEM
While in the parking lot of a local grocery store, I shifted the vehicle into reverse, at which point all dashboard warning lights immediately illuminated and the braking response became significantly weakened and nearly unresponsive. I placed the vehicle back into park, paused, and then attempted to shift into reverse again, but the dashboard alerts and brake issue persisted. This created a very unsafe driving situation because the brake system was very unresponsive. Despite the unsafe condition, I cautiously drove to my home 2miles away at a speed of under 20 MPH, requiring excessive brake pressure to bring the vehicle to a stop. I parked the vehicle in my driveway and left it there overnight. The next morning, I tested the brakes, and they seemed to return to normal so I drove 5 miles to my local GMC service center. Service Tech confirmed Check Engine Light On and reported code P0700 and P00FF in the report.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676023July 24, 2025
SERVICE BRAKES, ELECTRICAL SYSTEM
Driving down the road and I got a service trailer brake code pop up and would not go away and kept dinging It is very distracting and sometimes causes the trailer brakes to malfunction
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675652July 23, 2025
SERVICE BRAKES
GM is recommending that I replace my brakes for the 3rd time within 30,000 miles but cannot explain the irregular wear. I am confident that there is a larger issue causing this is the brakes failing are just a symptom of a larger issue that have failed to address after 6 dealership visits, escalating (twice - due to first advisor never getting back to me) to GM customer care, emailing an executive, regional service manager, and countless hours to fix the safety issue of my brakes (and the larger root cause issue). GM Customer Care Case #[XXX] - BRAKE SAFETY ISSUE 2024 GMC Sierra AT4 (VIN: [XXX]) - 46,000 miles Nov 2023: 1st visit - Brake squeal at 25K. Pads replaced, GM denied warranty. Early 2024: SAFETY ISSUE RETURNED at 30K miles. May 2025: 2nd visit - Worsening brake noise. Dealer couldn't replicate despite video evidence. Recommended $500 repair. Manager acknowledged "irregular/abnormal" wear. June 2025: 3rd & 4th visits - Tech found unexplained "weird line" on pad. Manager Kyle confirmed unusual wear but no root cause identified. June 10: Opened GM case #[XXX] after dealership failures. July 7: GM failed to coordinate promised appointment. July 14: 5th visit - Les Stanford Buick GMC, Ferndale. Tech rode with me, CONFIRMED BRAKE SAFETY ISSUE but offered no solution. CRITICAL SAFETY CONCERN: Recurring brake defect with abnormal wear patterns acknowledged by multiple technicians. Same brake failure pattern occurring 3 times in 18 months poses serious safety risk. Despite 5 dealership visits, video evidence, and confirmed defect, GM refuses warranty coverage while acknowledging the problem exists. Issue remains unresolved - I've exhausted all customer remedies. 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
#11675618July 23, 2025
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
Unloaded my Denali at huge loss with 30,000 miles because gm wouldn’t fix recall after many times in shop, broke down on freeway, and need to travel to Canada on business. Canada won’t allow vehicles with open safety recalls to enter country even though im pretty sure engine was MADE in Canada. Gm corporate office told me there’s nothing they can do. While in shop for 4 days of testing i watched vehicle on app, never started, moved, just put out back for 4 days then told absolutely nothing. Just wanted fair trade in for diesel. Truck looked identical to brand new on lot, 10/10 except engine recall. Gm promised to reimburse rental fees when broke down a week or so, submitted documents to Gm, nothing recieved. Bought ram instead for obvious reasons. Is there a lemon law, class action, agency etc that can help compensate for losses? The public should be warned!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675633July 23, 2025
STRUCTURE:BODY:TAILGATE
The contact owns a 2024 GMC Sierra 1500. The contact stated that while her husband was driving 55 MPH, the driver’s hand touched the tailgate button, and the tailgate opened. The contact was concerned about the items in the rear falling onto the highway. The driver pulled over and secured the items in the vehicle. There were no warning lights illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 2,000. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675290July 22, 2025
POWER TRAIN
AT AROUND 60,000 MILES I HAD EXPERIENCED SHUTTERING AND JERKING IN LOW GEARS AND THE VEHICLE SHOOTS FORWARD WHEN COMING TO A COMPLETE STOP. I WAS ABLE TO TAKE THE VEHICLE IN A SHORT TIME AFTER AND I WAS TOLD BY THE DEALERSHIP THAT IT NEEDED A TRANSMISSION FLUSH. I COMPLETED THE FLUSH AND AFTER A WEEK OR TWO IT STARTED DOING IT AGAIN. I TOOK IT TO A TRANSMISSION SHOP AND THEY ADVISED IT IS THE TRANSMISSION VALVE BODY THAT IS BAD. I BELIEVE THIS STARTED HAPPENING BEFORE MY WARRANTY WAS OUT BUT DUE TO ME BRINGING IT IN AFTER THE MILEAGE THEY WOULD NOT HONOR THE WARRANTY. THIS COULD CAUSE MULTIPLE HAZARDS AT STOPS AND WHILE DRIVING. NO WARNING LAMPS OR MESSAGE HAVE EVER APPEARED.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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