GMC Sierra Complaints

15,732 consumer complaints on file.

#11721107February 28, 2026
POWER TRAIN
Transmission started hash shifting and at highway speed it felt like the dark converter kept falling out of lock up. Stopped and took picture of service light
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721108February 28, 2026
ENGINE
I was out of town and driving on the highway around 75 MPH, when the motor suddenly lost all power. I was driving in the far left lane approaching an overpass. The sudden loss made it next to impossible to make it off the overpass on a very busy freeway safely while trying to navigate many cars trying to pass me . The truck came to a complete halt on the white shoulder line, 50' off of overpass SH 31. The truck would not restart or do anything i could not push it any further off road. I excited the e truck and stood off the freeway for my safety, as the truck was on very edge of freeway. GMC Roadside assistance took my truck to nearest dealer. This occurred on a Friday, dealership gave me a loaner car to get home as i was from out of town. They stated it would probably be the following Tuesday maybe Wednesday before they could tell me anything. I never heard from dealership service department, so i called them on Thursday morning and was told my truck motor had seized up and a new motor was needed. Service advisor stated GMC had been contacted and paper work started and I would be getting a new motor. The service advisor also stated that he had called and left a message. We verified my phone number and he had correct number, however I still never receive a call or voice mail. I still have not received any documentation on the failure or a repairs needed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721120February 28, 2026
POWER TRAIN
Was driving down the highway and was approaching a red light. As I was slowing down my transmission down shifted hard and my rear wheels briefly locked up and my truck went in to reduced power Took to dealership only to find out the valve body failed and my truck wasn't covered
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721163February 28, 2026
ENGINE, POWER TRAIN
While traveling on a major Route, the truck just turned off while driving. The truck was stuck in the middle of a two lane major route. Truck would not start or turn on. I was unable to put hazards on or put the truck in neutral. The engine siezed due to the GM recall. After having the engine replaced by a certified GM dealership, a few days later the Throttle body stopped working. Again, keeping me stuck. Certified GM dealership had to replace the throttle body.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721211February 28, 2026
POWER TRAIN
I’ve gone through two transmissions on my 2018 gmc sierra 1500 both times the same issue. The gears are shot, hard shifting. Vehicle is well maintained. Both transmissions one original equipment and second bought at the dealership the truck was bought both only lasted over 80000 miles. Driving the truck loss of power or torque is noticed, then a hard shifting. Checked fluid all was good not seeing metallic shavings. Then the overheating of the transmission, faulty valve replaced with aftermarket bypass and did transmission flush. But each occasion there was an incident I would’ve driving on the interstate and vehicle would lose power and almost hard stop and cause a crash. Then vehicle would only go in reverse both times the transmission gave out. The only warning light that ever came on was a transmission overheating and nothing else. I’m currently in the process of having to get another transmission because of the same issue again. Vehicle was seen by a technician and deemed the transmission was shot again.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720880February 27, 2026
VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM
The contact owns a 2025 GMC Sierra 1500. The contact stated that while the defroster was activated to clear the windshield, the blower vents on the passenger’s side started making an abnormal hissing sound, and air produced by the blower motor decreased and was inadequate to clear the windshield. There was no warning light illuminated. The contact stated that the failure occurred while there was light snow covering the hood and on the outside vents underneath the windshield. The contact had taken the vehicle to a local dealer several times, and the dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 3,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720886February 27, 2026
STEERING, ENGINE
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at various speeds, the steering wheel became stiff and difficult to steer to the left or the right. The power steering and check engine warning lights were illuminated. The vehicle was towed to a local dealer, where it was diagnosed with a corroded body ground strap. The error codes were cleared, and a test drive was performed. The vehicle was repaired out of pocket. Upon further investigation, the contact related the failure to the GMC Customer Satisfaction Program: N252515590; however, the VIN was not included. The manufacturer was not made aware of the failure. The failure mileage was approximately 37,061.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720900February 27, 2026
ENGINE, STEERING
I stopped at a red light in the middle of a 50 mph intersection when the light turned green The engine completely shut off, and it didn’t want to turn back on. I was stuck in the middle of the intersection in a very high risk area, putting myself and other drivers at risk. OnStar diagnostics didn’t report any issues with the truck. According to their diagnostics, everything should have been running perfectly fine. The motor shut down completely and we weren’t able to shift the truck into neutral in order to try to move out of harms way. There was no warning lights or anything before this happened. The first tow truck driver that came by was told that he was there “in order to do a jumpstart” He ran a diagnostic on both of the batteries and said that they were perfectly fine. Another tow truck had to be dispatched since the first wasn’t equipped to take the truck. In total we were stuck in the middle of the intersection for almost three hours. The amount of times we almost had someone crash into us during that time was very concerning. Dashboard and lights were all working perfectly fine. Auto start stop technology seems to have shut down the motor and was not able to get it to turn back on . This vehicle is a safety hazard.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720925February 27, 2026
STEERING
Power steering randomly cuts out very random and intermittent. So far only done at low speeds but worried if turning in an intersection and i lose steering.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720968February 27, 2026
ENGINE, FUEL/PROPULSION SYSTEM
Driving along a main road at 40-45 MPH and coasting toward a traffic light, the engine stalled out. Traffic light turned green and the vehicle would not accelerate. There were no warnings, check engine lights, or sounds. I could not pull to the shoulder due to traffic and had to pull into a left hand turn lane. The truck would not restart. Electrical systems seemed fine. Engine would turn over but not start on multiple attempts. One attempt finally got it to start but it immediately stalled. I was stuck in a dangerous situation at a busy intersection and no way to move the vehicle. It has been towed to the dealership.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721008February 27, 2026
FUEL/PROPULSION SYSTEM, ENGINE, ELECTRICAL SYSTEM
On Saturday at approximately 5:30 p.m., while driving on a two-lane city street with vehicles around me, my GMC Sierra began malfunctioning. The gauges flickered, warning lights appeared, and a transmission warning activated. As I attempted to safely pull over, the vehicle began stuttering and then completely stalled in the middle of traffic. Cars swerved and honked to avoid hitting me. Fortunately, no collision occurred, but the situation was extremely dangerous and frightening. AAA towed the vehicle to the GMC dealership. When I informed them of the incident, I received a text asking whether an over-the-air update had been performed prior to the stall. I confirmed the vehicle had received an update within the past three months. I was then told there is a bulletin stating that after an over-the-air update, the vehicle may suddenly lose communication with multiple modules and stall. The foreman indicated this was likely the cause and that they were consulting Technical Assistance. I asked when it is considered safe to drive a GMC vehicle following an update, as I was never warned that the vehicle could suddenly lose power and stall without notice. I was told they were investigating further. Yesterday, I was informed that engineering directed them to replace the ECM (Engine Control Module) and the Fuel Pump Control Module, with the ECM expected to arrive next Wednesday. I have not been given a confirmed timeline for completion. This appears to be a serious and known issue within GMC, yet there has been no recall and no warning provided to consumers. I was unknowingly driving a vehicle susceptible to sudden and complete power loss. This failure placed my life, my family, and the safety of others at significant risk.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721024February 27, 2026
POWER TRAIN
On 2/23/26 my GMC sierra 1500 AT4 3.0L Inline-6 Turbo-Diesel, it auto stopped (which I will never keep on again) on an incline and would not start back up or shift gears and rolled a few feet. I had to turn it off and restart it, then the engine light came on and a notification about conditions not favorable for shifting? My app said service was needed for engine/transmission issue. I took it to the dealership and it now has to have the transmission control valve body assembly replaced. I did not receive a recall notice for my truck but, it seems to be the same issue that the recall was for on GM vehicles of the same time period. Of course the dealership said they have no loaner vehicles and I'm supposed to be without my truck for approx. a week and a half at this point. I am disappointed with GMC and the quality that I am paying $70k for. I had a 07' Silverado 2500 I purchased new and drove it for almost 15yrs. w/ no issues. Hopefully this is a good fix and it'll last but, from what I've seen, GM is not the quality it used to be. This is on top of being in the shop for a coolant control valve issue that wasn't recalled either but, a known issue on the pickups so beware. I did call GMC and they will reimburse up to $44 a day on a rental (has to be a GM vehicle btw) during this fiasco of course afterwards and with a bunch of paperwork but, I have to have a vehicle, in TX nothing is close by. Good luck everyone!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721042February 27, 2026
STRUCTURE:BODY
The front upper grille molding/deflector located above the front grille and directly below the hood on my 2022 GMC Sierra 1500 has become loose and is separating from the vehicle. The left side attachment points appear to have failed, allowing the plastic component to visibly move and lift while driving at highway speeds. The condition worsens with airflow, and the part vibrates and flexes significantly while traveling on the freeway. This creates a safety concern because the component appears at risk of detaching completely from the vehicle and becoming roadway debris, potentially striking other vehicles or causing drivers to take evasive action. No warning lights or dashboard messages were present prior to discovering the issue. The problem was first noticed after observing movement of the grille trim while driving at normal highway speeds. The vehicle has not been involved in any collision or modification that would cause this condition. A GMC dealer inspected the concern and confirmed the vehicle is not currently included in an active recall despite an existing GMC recall addressing grille deflector detachment on similar 2022 Sierra 1500 vehicles. The defective component is currently still installed on the vehicle and available for inspection upon request. Due to the risk of detachment while driving, vehicle operation at highway speeds now presents a potential hazard to surrounding traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720842February 27, 2026
POWER TRAIN
Vehicle is shifting hard when switching gears. Typical with the recall and the valve body being the issue. Dealership is saying it is not covered by recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720586February 26, 2026
POWER TRAIN
Engine coolant control valve failure. This is a widespread issue on 2020-2022 3.0L Diesel trucks and it hasn’t been addressed by GM, leaving owners to pay out of pocket for a faulty part.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720592February 26, 2026
ENGINE
My gmc sierra Denali 2022 equipped with the 6.2 motor locked up while I was driving pulling me out of the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720633February 26, 2026
ENGINE
Motor seized while driving
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720680February 26, 2026
STRUCTURE:BODY
Front grill deflector detached from vehicle when traveling on highway. This is a recall repair for the same issue. There were no warning lamps.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720688February 26, 2026
AIR BAGS, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, LANE DEPARTURE: WARNING
Following engine replacement per NHTSA for 6.2l GMC engine. I am submitting a safety complaint regarding my 2022 GMC Sierra 1500 Denali (refresh body style). The vehicle has experienced repeated failures of driver-assist features and safety system warnings, including: Dash messages: “Lane Keeping Assist System Unavailable” and “Service Safety Restraint System.” When the fault occurs, driver-assist features including Adaptive Cruise Control become inoperative. The issue has recurred multiple times, including after repairs. After one event, the truck sat parked approximately 10 days and the battery discharged to failure and required replacement. A dealership visit documented DTC U3000 (“Internal Electronic Failure”) in the front view camera module. The dealer replaced/programmed/calibrated the front camera on 02/09/2026 at approximately 58,405 miles (invoice/RO #285795). The symptoms have recurred despite prior resets and this repair. I am concerned about loss of driver-assist functions while driving and the presence of a safety restraint system warning. Please investigate whether there is a defect related to the front camera/driver-assist systems and/or electrical module behavior that can cause repeat faults and battery drain on this model.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720754February 26, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); and the vehicle was taken to the dealer, where the contact was informed that no repair was needed, upon inspection. The contact stated that while driving at 70 MPH, the vehicle stalled. There was no warning light illuminated. The contact was able to pull over to the side of the road. The vehicle failed to restart and was towed to the dealer, where it was diagnosed and determined that the engine had failed and needed to be replaced. The vehicle was in the process of being repaired free of charge. The contact related the failure to NHTSA Action Number: RQ26001 (Engine). The manufacturer was notified of the failure, but no vehicle rental assistance was provided. The failure mileage was approximately 45,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

← Back to GMC Sierra