GMC Sierra Complaints (2024)

545 consumer complaints on file.

#11730614April 12, 2026
SERVICE BRAKES, POWER TRAIN
When I begin to accelerate on the highway, and the truck downshifts, it locks up the rear brakes.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730328April 10, 2026
ENGINE
Engine Failure. I was driving down the highway pulling a trailer and the RPMs raced up and I instantly lost power. Had to try and get over to the right lane/shoulder after losing all power. Extremely scary situation going 75mph on a 3 lane highway in the left lane. Luckily I made it to a safe spot but once there, I could start the truck. It. Would sit a power cycle. Tow truck couldn’t get it into neutral so had to drag it up the flat bed. After being towed to dealer they confirmed the engine was shot and ordered a new one on March 9th. We are now over 30 days without my truck. This has not been inspected by anyone besides the dealership it was towed to and the dealership I bought the truck from and use for service. My truck was in the shop many times prior to this. Had to have the cam shaft replaced before the recall fix was published to dealerships. Once fixed my wife picked it up with my child and once they left the dealership it started vigorously shaking again and she brought it back to be told it was a fault plug and plug wire. Once our VIN came up for recall it passed the test and they put new oil in and sent me on my way. A couple weeks later it was acting strange again and I brought it back for them to again say it was a faulty plug/wire. About two weeks after this is when the engine locked up. Truck has 38,000 miles and doesn’t feel safe for our family. What can we do?!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730404April 10, 2026
BACK OVER PREVENTION, ENGINE, ELECTRICAL SYSTEM
The contact owns a 2024 GMC Sierra 2500. The contact stated while reversing, the rear-view camera displayed a blank screen. The 4WD system engaged unintendedly, and the park assist sensor was inoperable while an unknown message was displayed. Additionally, the vehicle lost motive power while driving. The check engine warning light was illuminated. The vehicle was towed to the dealer, who replaced an unknown module and reset the computer, but the failure persisted. The contact stated that the vehicle was taken to the dealer five times, but the failure recurred after several unknown repairs. The vehicle was not repaired. The contact had requested for a buyback from the dealer, but no assistance was provided. The manufacturer was made aware of the failure. The failure mileage was approximately 8,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729845April 8, 2026
UNKNOWN OR OTHER, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
“Service Driver Assist System” message appears every time I turn on my truck. Vehicle would randomly break when driving at slow speeds and show the forward collision alert even if no objects/ car are approaching or being approached. I am concerned about my safety because those sudden hard-breaks could cause an accident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729851April 8, 2026
ENGINE
Engine seized while driving. vehicle was inoperable.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729346April 6, 2026
ENGINE
Had recently turned 40,000 miles and was driving down a highway; ,lost all power had to get towed to dealership. Was told engine went out, and had to get another. Would be weeks, still no engine. Was towed 3/2/2026. Common problem finding out, was a 90k vehicle unacceptable!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729038April 3, 2026
FUEL/PROPULSION SYSTEM
The service department has identified "gasoline contamination" as the cause of a fuel system failure; however, this diagnosis is directly contradicted by both the shop’s internal test results and independent laboratory analysis.the shop performed an API Gravity test and a Styrofoam cup test.•API Gravity Result (35): According to GM Service Information (GMSi), the standard API range for #2 diesel is 30–39. result of 35 is a textbook "pass" for clean diesel. Gasoline contamination would typically spike this number into the 50s.GMSi protocol indicates that gasoline-contaminated diesel will melt a cup within 30 minutes.results only provided a "softened bottom," which is an inconclusive result per GMSi standards.Sinclair Refinery lab confirms the fuel sample taken from my vehicle is within 100% of factory specifications for diesel, with zero gasoline or DEF detected.Violation of GM Service Protocols even assuming the shop’s diagnosis of contamination was correct, the repair performed deviates dangerously from GMSi requirementsFor a 2024 L5P Duramax that has been cranked with contaminated fuel, GMSi (e.g., Bulletin 16-NA-376) mandates the replacement of the entire high-pressure fuel system, including the pump, both fuel rails, and all eight fuel injectors. shop replaced only the pump and cleaned the lines. This "partial repair" is not a GM-approved recovery procedure for contamination. Reusing potentially contaminated injectors and rails is the primary cause of catastrophic repeat failures.This clearly falls under warranty work and I should not had been charged for this repair. The dealership refusing to acknowledge my concerns and evidence is not only dangerous to the safety of myself and passengers, but raises concern for my vehicles future maintenance status, both inside and out of warranty. This shows a deceptive business practice and complete lack of accountability, compassion and moral understanding for the customer.I am owed a full refund and a warranty claim open
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729098April 3, 2026
POWER TRAIN
While driving west on Hwy 20, near Augusta, GA my vehicle motor blew without any warning. I had to guide my dead but rolling truck and trailer to the side of the Hwy against a high retaining wall. The truck shut down and set the brakes after stopping and would not restart, shift into neutral, or move without special two equipment. **when I received the first recall notice I call my GMC dealer and they said their was nothing they could do yet. Later I received a second notice and responded to GMC dealer where the changed the oil and cap. A few weeks/months after that the motor blew. GM has refused to be any help and replacement motor has been on back order for 3 weeks and counting.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728293March 31, 2026
STRUCTURE:BODY
The front upper grille broke off and detached at highway speeds. The grille impacted the hood, causing a scratch and dent and became a road hazard and has the potential to cause an accident. This is the same failure reported in NHTSA Campaign Number: 25V-060 that only covers 2022 model years. Research online indicates failures in 2022, 2023 and 2024 vehicles. GMC to date will not warranty or recall this gross safety violation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728039March 30, 2026
EXTERIOR LIGHTING
the rear lights do not function they quit working and there is no parking lights tail lights brake lights
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727437March 27, 2026
TRAILER HITCHES
The contact owns a 2022 Safe Haven 12-foot Flatbed Trailer. The contact stated that while driving approximately 10 MPH and towing the unloaded trailer with a 2024 GMC Sierra 2500, while slowing down to make a right turn, the trailer detached from the tow hitch ball. The contact stated that there were no warning lights illuminated. The contact stated that the aluminum arms on the hitch adjoined to the frame of the trailer was loose. The contact stated that because of the design of the hitch, the receiver that rests on the trailer hitch was not flush, and there was room for the trailer receiver to move up and down, causing the bolts to loosen. The contact called the manufacturer and was informed that it was the normal of the bolts. The trailer was taken to an authorized dealer, and the contact was informed that the trailer was attached incorrectly. The vehicle was not diagnosed or repaired. The failure mileage was approximately 1,200. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727368March 26, 2026
POWER TRAIN
While driving a "Service Transmission" message appears on the information center. The truck shifts slowly, sometimes slamming into gear, doesn't seem to have smooth acceleration through the gears until a high gear is reached. Unusual sounds occur during the shifting sequence. The vehicle was dropped off at the dealer for service. Dealer claims that since they were not able to duplicate the conditions reported to them, the vehicle was fine and not in need of any further investigation or service. Transmission problems are a known concern with vehicle as recalls have been expanded to include this class of truck in the recall but GM is not including this vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726911March 25, 2026
SERVICE BRAKES, VEHICLE SPEED CONTROL
At speeds of 65-75, both with the adaptive cruise control enabled and disabled, I accelerated a little bit to pick up speed and pass another vehicle. The vehicle responded initially by gaining speed, then it feels like I hit something and the front brakes lock up for 1-2 seconds and the tires start screeching from sliding, then everything resumes to normal. I was very shocked during a recent roadtrip when this happened 4-5 times. I feel like my safety and my family’s safety is at risk and of the 2 dealerships I called, they don’t prioritize it and make it seem like a minor repair.
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
#11725704March 19, 2026
STRUCTURE:BODY, UNKNOWN OR OTHER
While driving 65mph in my 2024 GMC Sierra Denali Ultimate on Interstate 270 in Hilliard, Ohio my chrome grill deflector just flew off and hit my windshield. It then went over my truck and almost caused a major accident with the cars and semi-trucks behind me. I was lucky to maintain control of my own vehicle! It appears to me that the mounting fractured and it looks like manufacturing defect. Looks like the same issues recalled in 2022 year models. How many have to die before GM fixes this issue? They now want $1,500 for a new grill on my 2024 truck.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725286March 18, 2026
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:UREA INJECTION SYSTEM (DEF)
The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the fuel level indicator on the instrument panel became inoperable and provided incorrect information. The contact stated that due to the inaccurate fuel level, the vehicle almost went into LIMP Mode with the message “Refuel - EMPTY Now” displayed. The vehicle was taken to the dealer, where it was diagnosed, and determined that the DEF tank had failed and needed to be replaced. The vehicle was not repaired. The contact was informed by the dealer that parts to repair the vehicle were on backorder. The manufacturer was made aware of the failure. The failure mileage was approximately 34,895.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725355March 18, 2026
ENGINE, POWER TRAIN
My 2024 GMC Sierra 1500's engine has gone bad, and needs to be replace after only 71,000 miles, and this is only 90 day after already replacing the transmission
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725375March 18, 2026
ENGINE
The contact owns a 2024 GMC Sierra 1500. The contact stated while driving 35 MPH, the vehicle shut off while making a turn and started shaking abnormally. Several unknown warning lights were illuminated and the contact pulled over to the side of the road and turned off. The vehicle failed to restart. The vehicle was towed to the dealer and was diagnosed, and it was determined that the engine had seized and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 25,524
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724825March 17, 2026
ENGINE
Engine failure on March 8, 2026. 2024 Sierra Denali 1500 VIN [XXX] Prior to this incident, the vehicle was taken to the same dealer due to the safety recall. The engine was inspected on November 12, 2025, and I was told that it "passed," with the remedy being a change in oil viscosity. I was driving on March 8, 2026, when I heard some odd noises (clanking and knocking). Shortly thereafter, the engine just stopped in the middle of the road. It would not restart, and as a result, I couldn't put it in neutral to roll it out of the roadway. It remained stuck in park. I was stuck for 2+ hours in the rain, waiting for a flatbed wrecker. Cars were unable to pass in either direction. When the tow truck arrived, I was told it had to be dragged on to the flatbed with sleds due to the transmission being stuck in park. The truck was taken to Carl Black GMC in Roswell, GA. On Monday they confirmed that the engine had seized and needed to be replaced. The repair was completed, and I picked up the vehicle on Friday, March 13. 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
#11724530March 16, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
The vehicle went into low power mode and said to pull over. As soon as that message appeared the next warning appeared and said to shift to neutral and pull over immediately and attempt to restart. The vehicle immediately shut off after second warning before having time to pull over from first message. I was able to pull most of the way off the road as the vehicle had shut off there was no power steering and had limited ability to steer the vehicle. This all happened without advance warning or any other warning that there was an issue while traveling at over 75mph. Vehicle would not restart and needed to be towed. Dealer stated it was a fule control module that was hard to get due to a recall. But that my vehicle was not part of that recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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