GMC Sierra Complaints

15,732 consumer complaints on file.

#11728246March 31, 2026
ENGINE, ENGINE AND ENGINE COOLING
The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, there was an abnormal tapping sound coming from the vehicle. The check engine warning light and an unknown warning light were illuminated. The contact stated that the failure had occurred while traveling out of state. The dealer was made aware of the failure, and the contact was informed that the repair was not covered under recall. The vehicle was towed to an independent mechanic, where it was diagnosed with lifters failure. The contact was informed that the lifters and camshaft needed to be replaced. The contact was informed that the lifter's failure had damaged the camshaft. The vehicle was being repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 99,700.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728267March 31, 2026
STRUCTURE:BODY, ELECTRICAL SYSTEM
Electronic truck tail gate opened while driving after washing vehicle. The tailgate button on the FOB or inside the cabin were not pressed.
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
#11728308March 31, 2026
UNKNOWN OR OTHER
I’ve owner the vehicle since new. My A/C condenser has failed 3 times, meaning I’m now about to be on my 4th. The welds are weak and it cracks in the same spot 95% of the time. It should last more than a 2 year average.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728316March 31, 2026
UNKNOWN OR OTHER
P1098 code coolant control valve fail service bulletin N252508341 my vin not covered but same motor and same part !
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728395March 31, 2026
SERVICE BRAKES, ELECTRICAL SYSTEM
I stopped at a stoplight and my truck shut off, the doors unlocked and then immediately restarted and then came up with a bunch of errors telling me that my brake system failed and to get the traction control serviced. I then had no power braking. This is the second time my truck has shut off at a light and restarted, but I don’t lose my brakes the first time.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728402March 31, 2026
POWER TRAIN
I believe the torque converter is failing. While driving approximately 38 mph and also 48 mph up to 51 mph the vehicle have a vibration feeling like driving on a rumble strip. If you maintain the same speed, the vibration continues if you speed up, slow down, or let off the gas it goes away. There are so many detailed explanations on forums and social media from other customers experiencing the same problem, but not seeing any recall made by GMC.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728418March 31, 2026
ENGINE, POWER TRAIN, STEERING
I reported problems with my truck to Beck and Masten South GMC. I was put off a number of times with ridiculous excuses. My vehicle sat in the shop for a month to get my OnStar safety equipment repaired. I also had arguments with them regarding the oil light coming on and it burning excessive amounts of oil. I was told this was normal. I know better. Also, I needed to get it back into the shop for service and inspection for a squeeling noise under the hood. And to have them check the oul consumption. I was told it idle too often, and this was the reason oil was dissapearing. I was told they would put me on the loaner list so I could have means to get to my oncologist for cancer care. Well, I called numerous times because they never furnished a loaner for these issues I was told a third, then forth time I was next in line for a loaner so I could drop it off for repairs and recall work. After 8 months of these lies I finally went to Monument Chevrolet. Beck and Masten never intended to help me. Total I had tried and was told by newer service advisors, the manager, and GMC this would be remedied over 10 times in over 6 months. I finally gave up and moved on to never return to this dealer I had purchased two brand new GMC 1500 trucks from in a two year time frame. I did get my OnStar gateway repaired by replacement. It had stopped working again,shortly after getting it back. I kept getting put off. They stated it needed another Gateway for OnStar. I kept calling,and was told they would contact me ince it came in. I ended up troubleshooting the entire modem/router assy. I found inconsitant configuration parametrs. So, I reconfigured it all from start to finish after clearing the memory by taking battery cables off and allowing it to power down and clear memory. Then I did perform a reconfiguration and username/password change as well. I repaired it myself. The Onstar has never acted up again. These were my first issues. I had to take it to Monument Chevrolet for service
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728086March 30, 2026
POWER TRAIN
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle vibrated and felt as if the transmission was going to unexpectedly downshift. No warning light was illuminated. In addition, there was an abnormal sound coming from the rear wheels. The contact stated that it felt like the rear tires were driving in the wrong gear. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The contact stated that the failure persisted and became a worsening failure. The manufacturer was not notified of the failure. The failure mileage was approximately 75,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728087March 30, 2026
ENGINE
Engine knocking, constantly kicking into limp mode, shaking when driving. Taken to GMC and local repair shops. Limp mode will not stop kicking on. Now other issues will mean total engine replacement needed. Mechanic says it’s not worth repairing at this point. Only 109k miles on it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728140March 30, 2026
ENGINE
Motor spun a bearing on the crank and the vehicle is needing a new motor. 73,000 miles. Passed the GM recall inspection less than 6 months ago. Vehicle has had regular oil changes and all maintenance done on time. Engine started hard then started knocking. Made it to dealership for diagnostics.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727937March 30, 2026
ENGINE
The contact owns a 2017 GMC Sierra 2500 Denali. The contact stated that while driving at an undisclosed speed, the vehicle went into LIMP Mode. There was no warning light illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed and determined that the knock sensor had failed and needed to be replaced. The vehicle was not repaired. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 209,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728038March 30, 2026
ENGINE
I was traveling on the I70 West around the 210 mile marker. I was in the passing lane at high speed when the vehicle without warning switched itself off. The dash showed the “press start” warning, but the vehicle would not restart. I was fortunate that I was around 1/2 a mile from a rest stop area. I was able to glide the vehicle into the rest area. As I slowed close to a stop the vehicle suddenly stopped and applied the park brake. I am a very experienced driver, if my wife was driving, the vehicle shutting down completely in the fast lane could have been catastrophic. The road was busy. The vehicle was locked up in Park and was unrecoverable. It had to be dragged sideways out of the area that it had come to a stop, and then dragged onto and off the tow truck. The following morning the dealership confirmed the engine was seized. When I purchased the vehicle, the dealership confirmed that the historic failures on the L87 6.2L V8 engine were resolved. Clearly not the case.
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
#11728045March 30, 2026
AIR BAGS
The contact owns a 2015 GMC Sierra 1500. While traveling on a two-lane highway at approximately 55 MPH, another vehicle suddenly turned into the contact's lane, resulting in a severe frontal "T-bone" collision. The force of the impact caused the other vehicle to be propelled into a ditch, while the contact's vehicle remained on the roadway. Despite the significant nature of the crash and the speed involved, no air bags deployed. The dealer was notified of the failure. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 218,000.
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11727753March 29, 2026
POWER TRAIN
Transmission shudder and vibration at highway speed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727637March 28, 2026
ENGINE
My vehicle is a GMC Sierra 1500 Duramax diesel. The vehicle experienced a failure of the DEF (Diesel Exhaust Fluid) system, which was diagnosed by the dealership as a failure of the DEF tank heater. The heater is integrated into the tank assembly, requiring full replacement of the DEF tank. As a result of this failure, the vehicle became unusable and has been out of service since March 3, 2026. The dealership confirmed that the required part is on national backorder with no confirmed availability date. This condition creates a significant reliability and potential safety concern. When the DEF system fails, the vehicle can enter a reduced power or speed-limited mode, which may occur during normal driving and could create unsafe conditions in traffic. Additionally, there appears to be a broader pattern of similar failures affecting other vehicles of the same type, combined with extended delays in obtaining replacement parts. The lack of parts availability results in extended periods where the vehicle cannot be safely or reliably operated.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727719March 28, 2026
STEERING
Loss of steering, erratic steering control. Steering locks up
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727414March 27, 2026
POWER TRAIN
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving on several occasions at various speeds, the vehicle started shaking and slipped in and out of gear, with the message "Idle Transmission" displayed. The vehicle was pulled over and shifted into park(P) and then to drive(D). There was a loud banging sound coming from the rear of the vehicle. The vehicle was towed to an independent mechanic, where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be repaired. The vehicle was not yet repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 80,000.
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

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