GMC Sierra Complaints

15,732 consumer complaints on file.

#11675355July 22, 2025
WHEELS, FIRERELATED
See attached document for complaint.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11675469July 22, 2025
POWER TRAIN
A 2022 Sierra 1500 had a catastrophic engine failure while driving. The vehicle was unstable and came to rest. The issue has been confirmed base on the recall notice. The vehicle has been sitting at the dealer for three months waiting for GM to 'Open' the recall on this vehicle. Customer Service has been contacted on several occasions but the recall is still not opened.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675477July 22, 2025
EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM)
The embedded navigation system in my 2018 GMC Sierra is no longer supported. Paid map updates were available until 2023, when General Motors discontinued them without notice. This system was marketed as a core feature and provided offline GPS guidance independent of cell reception. I discovered the change while attempting to purchase an update and was told there are no remaining copies and that no further updates will ever be made. I was never notified. When I contacted support, I was transferred through six departments. One representative admitted that customers were supposed to be informed but were not. She stated they are trained to say “there’s nothing we can do” and acknowledged receiving hundreds of similar complaints. She also confirmed the final map update existed but was allowed to sell out. This puts safety at risk, particularly for drivers in rural areas, areas with poor cell service, or while towing. The system is not CarPlay-based and does not rely on mobile data. It was the only in-vehicle routing system many drivers depended on during travel, including emergencies. Its quiet discontinuation means drivers no longer have access to accurate, integrated navigation—reducing their ability to safely plan or adjust routes while on the road. The failure to maintain this system or provide reasonable access to the final update undermines long-term vehicle safety and owner trust. General Motors has not offered an inspection, recovery, or remedy.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674994July 21, 2025
STRUCTURE:BODY:BUMPERS:ACTIVE SHUTTERS/GRILL
The contact owns a 2023 GMC Sierra. The contact stated that while driving at an undisclosed speed, the grill reflector above the grill detached and flew off into traffic. The vehicle was taken to a dealer, where it was diagnosed that the reflector needed to be replaced. The vehicle was not repaired. The contact believed that the failure was associated with Manufacturer Recall Number: N242490120. The manufacturer was notified of the failure. The failure mileage was 43,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675155July 21, 2025
ENGINE
When I started my truck in the morning I noticed the check engine light came on and my engine fan started running really loudly. I shut my truck off and let it sit for 5 minutes and restarted it in hopes the check engine light would not appear. Unfortunately it did come back on and the engine fan began running really loudly again. I drove the truck to the nearest mechanic and you could feel the truck was trying to counter the problem by forcing me to drive it in a lower speed. After taking it to a shop to get it scanned to see what the code was. The mechanic said it was reading code P1006 three times. He said this coolant system and is why my engine fan was triggered to run really loudly. But the engine was not over heating as all other indicators showed that temps were normal. The mechanic believes it could possibly just be a faulty wire. However after talking to GM he said if it is this coolant part that needs to be replaced, it could take up to months to fix as the part is on national backorder. Doing more research, it appears others have had this same problem and GM even knew shortly after this model was released that this would happen.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675213July 21, 2025
POWER TRAIN
Purchase a used 2022 GMC Sierra 1500 Denali with a 3.0L diesel at around 42,000 miles. Drove it for about 1,500 miles before I started noticing unusual shifting with the transmission which became more noticeable with time. At around 44,000 miles, the truck had two hard shifts going 35-40 MPH on a flat round and put itself into limp mode. Turned off and on the truck multiple times, the engine light always stayed on but the symptoms would come and go. Either way the truck always went back into limp mode after a few miles. I did a quick scan and it came out with a P0700 and P0746 code. I limped it to the dealer and was told that it was a bad valve body which is apparently on back order with no ETA and they can’t tell me when I will get my truck back.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675215July 21, 2025
ENGINE, POWER TRAIN
The check engine light came on at one point. I took it to figure out why the check engine light was coming on and the scanner indicated that the NOX catalyst was below threshold. I researched it and it is a common issue. The check engine light eventually turned off after a couple of days. About 2 weeks later it came back on. I noticed as i was driving the coolant fans were running at 100% meaning that they were blowing long and hard. So I scanned it and it said that the engine coolant valve was at fault. This is also a common issue with the vehicle, particularly in the 2021 GMC Sierra 1500 3.0 Turbo Diesel. It is a faulty part and it costs thousands of dollars to replace. How can these two issues not be on a national recall by GM? They are too common and very expensive to repair. This issue is so common that now the valve is on a national back order. Meaning the parts may not be available for 30-120 days. The vehicle is not safe to drive with a bad engine coolant valve. I have now a rental car for the past 7 days while my truck sits waiting for a valve to arrive and pay thousands in repair just to drive it again.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675224July 21, 2025
ELECTRICAL SYSTEM
Tail gate keeps opening
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674911July 20, 2025
SERVICE BRAKES
Starting vehicle in parking lot and backing out of parking space. Brakes failed and truck continued to roll backwards almost hitting a pedestrian. I was able to stop hard on the pedal and stop the vehicle. This has happened several times. I have a steep driveway and backing down to the street the brake pedal will unexpectedly have little resistance and the truck will continue to roll into the street almost hitting oncoming traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674699July 19, 2025
ENGINE, ELECTRICAL SYSTEM, STRUCTURE:BODY
I was driving my 2022 GMC 2500 HD (not towing, just normal drive) after an oil change <900 miles ago and new brakes/rotors 3 days prior <100 miles (total mileage 81,000, serviced exclusively at GMC dealership) when the loss of power alert flashed on the screen. I was 2 miles from my destination, going approx 55mph, so I kept driving to destination, when the vehicle stalled in driveway. As I was scrolling through menus to see the alert I looked up and smoke and flames were coming out of the engine. I attempted to extinguish with a fire extinguisher I had with me, but it was no use. The entire engine was engulfed, melting out, tires and windshield exploded from heat etc. Total loss. Vehicle was inspected by insurance co fire investigator, no origin confirmed due to extent of damage. Vehicle was offered to GMC for their inspection as it was partially under OEM warranty and I had an extended warranty from dealership, which I also notified. Extended would not do anything without the vehicle at GMC and diagnosis, which again, there is no engine etc so not repairable. GMC was to be in contact with insurance co. No status update received.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11674713July 19, 2025
ENGINE
On 7/17/25 vehicle was taken to Star Buick/GMC in Easton PA for rear brakes and an oil change. This vehicle has 49,981 miles on it. I was told after the oil change the tech took the truck for a test drive. I was told he made it about 20 feet and the engine seized. Either the tech forgot to refill the crank case or it is another GM 6.2 disaster. Please advise as the dealer is quoting over 12K to replace engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674715July 19, 2025
SUSPENSION
The mount for the rear shock absorber has completely rusted away on the driver side. The tube is gone now that it was attached to. This is a way to new of a truck for that kind of rust to happen I have been around 40 year old trucks that this never happened to.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674727July 19, 2025
ENGINE, POWER TRAIN, FUEL/PROPULSION SYSTEM
I own a $35,000 2018 gmc Sierra 1500 6.2l V8 4x4 Denali, which is currently down due to engine failure while I was driving down the road.. never had a check engine light on the dash. Haven't had the truck a year before it quit. Rods knocking, crankshaft bearings, loss of power, high rpm with little acceleration. I could have the peddle down to the floor and would barely get to 20 mph.. the motor would jump so bad, you would think it's going to jump out the truck. I have replaced several parts on the truck, including oil pump, filter, solenoid valve sensor, fuel pump, injectors, and sensors, battery, starter a couple times. Did all that replacing for it to get worse and finally quit while driving.. I was stranded in the middle of the road.. IV reported it to the Recall people, but nothing helped. I have taken my vehicle to Express Chevrolet and they did a diagnostic test, which I provided the list they gave me below. When I took it to them, I was using Endurance Warranty, but they denied my claim due to the issues and they didn't cover them. At the time, the motor was still jumping, but smoke was coming out the tailpipe extremely bad, the truck was jerking and jumping. After replacing everything I listed, the truck got worse, started screeching and knocking loudly, loss of engine power, little acceleration. The day the motor quit on me while driving, I got the mph up to about 55-60 and it just quit, and hasn't started back since.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674781July 19, 2025
ENGINE, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
My GMC had a terminal engine failure around 5/3/25. This disengaged the ESC, parking brake, and driver assist abilities as well as making the truck undrivable. GMC service diagnosed the truck needed an entire new engine. The repair took over 2 months to complete and now that I have the truck back, the adaptive cruise control is not working.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674626July 18, 2025
ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY
The contact owns a 2016 GMC Sierra 1500. The contact stated while the vehicle was parked, the contact became aware that the radiator was leaking fluid. There was no warning light illuminated. A dealer was contacted. The vehicle was taken to a dealer where it was diagnosed and determined that the radiator needed to be replaced. The vehicle was repaired. The manufacturer was not notified of the failure. The contact was referred to the NHTSA Hotline for assistance. The failure mileage was 98,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674427July 18, 2025
SERVICE BRAKES, STEERING
My booster is leaking into the floor. I took it to the dealer and they said it was the booster and it needs to be replaced. This could make the truck lose its brakes and run into something or someone.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674474July 18, 2025
ENGINE, POWER TRAIN
wn a 2021 GMC Sierra 1500 6.2L (VIN: [XXX] ), which is now experiencing a severe misfire, engine ticking, and diagnostic code P318A. I’ve confirmed this issue is related to GM Recall N252494001 for engine connecting rod/crankshaft failure. However, I’ve been told my VIN has not yet been activated for recall repairs, and both the local dealership and GMC support have refused to escalate my case or offer assistance. This is a known safety issue, and I’m now at risk of total engine failure and significant financial loss while waiting for GM to act. 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
#11674490July 18, 2025
POWER TRAIN, POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY
The contact owns a 2024 Chevrolet Sierra 2500. The contact stated that while his son was driving 60-62 MPH in tenth gear, the transmission unexpectedly downshifted to seventh gear. There was an abnormally loud clunking sound coming from the vehicle. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the valve body needed to be replaced. The vehicle was not repaired due to the parts being on backorder. The manufacturer was contacted, but no additional assistance was provided. The failure mileage was approximately 68,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674179July 17, 2025
ELECTRICAL SYSTEM, EXTERIOR LIGHTING
The entire instrument panel is blacked out. I can not see the speed, how much fuel and no waring lights etc. The screen flashes between black and dark blue and there is a repetative "ding" that I have no idea what is caused from since I can not see any warning lights, etc.This puts me and others at risk due to not being able to see any functions for operation of the vehicle, the speed or any indicator lights of vehicle issues. The dealer has seen the truck, and informed me that this is a known problem and they would have to order parts. According to the service department, parts for replacement will be covered under warranty/recall and they have been on order. It has been 3 weeks and they have no knowledge of when the parts will be in to make repair. There was no warning on this problem, the panel just went out.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11674200July 17, 2025
POWER TRAIN, ENGINE
The contact owns a 2022 GMC Sierra 1500. The contact stated that after shifting to drive (D) and depressing the accelerator pedal, the vehicle failed to respond as intended. The contact shifted to park(P) and attempted to turn off the vehicle; however, the vehicle failed to turn off. The contact stated after several attempts, the vehicle turned off; however, the contact was unable to restart the vehicle. The contact stated that the "Service Engine" warning light was illuminated. The contact had the vehicle towed to a dealer. The contact stated that the tow truck driver was unable to shift the vehicle to neutral(N) to winch the vehicle onto the flat bed. The dealer had not yet diagnosed the vehicle. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 17,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

← Back to GMC Sierra