GMC Sierra Complaints

15,732 consumer complaints on file.

#11683173August 26, 2025
UNKNOWN OR OTHER
Vehicle showed me error code “ brake failure dont drive over 43mph “ And some other error codes I took the vehicle to the dealer because it was serious They made me sign a diagnostic fee document that i will be responsible for the diagnostic But the issue was just battery needed to be replaced according to the dealer we did the repair at the dealer Battery + hours + diagnostic But the misleading error codes made me take the car to dealer what was unnecessary So please look into it Customer are getting charged for unnecessary repairs because of misleading error
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683187August 26, 2025
ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE: WARNINGS, LANE DEPARTURE: WARNING
On August 15th, 2025, I brought my new 2025 GMC Sierra 1500 Denali to Bill Cramer GM Dealership, 2251 W 23rd St, Panama City, FL 32405, due to a complete loss of audio in the cabin. This affected the turn signals, radio, and critical safety alerts, including collision warnings and seatbelt reminders. Given the vehicle's high cost and its status as a new premium model, this malfunction was both disappointing and alarming, particularly due to its implications for safety. This occurs about every third time I drive the vehicle. The dealership retained my vehicle for over a week to diagnose and address the issue. I received an email stating that the service was complete and the truck was ready for pickup. However, upon arrival, a service technician informed me that they could not identify the cause of the audio failure and, consequently, no repairs were made. I was told the dealership would continue consulting with General Motors' corporate engineers to determine the cause and solution.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683220August 26, 2025
LATCHES/LOCKS/LINKAGES
The contact owns a 2021 GMC Sierra 2500. The contact received Manufacturer's Recall Number: N232426400, for water intrusion into the electronic gate-release switch. The vehicle was repaired. The contact stated that six months after the vehicle was repaired, the tailgate failed to operate as intended. While at the residence, the taillights and headlights were flashing. The contact also became aware that the tailgate had unlatched independently while the vehicle was parked. The message "Integrated Tailgate Open or Integrated Tailgate not Latched" was displayed. The contact stated that there was an abnormal clicking sound coming from the actuator when the tailgate opened independently. The vehicle was taken to the dealer, where it was diagnosed that there was water in the switch. The dealer informed the contact that the repairs were already made and, due to the water intrusion into the switch, the dealer refused to redo the repair under the previous recall. The vehicle was repaired. The manufacturer was notified of the failure, and denied assistance since the recall repair was already performed. The failure mileage was approximately 53,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683253August 26, 2025
STRUCTURE:BODY
Recall Number N242490120 was performed in April 2025 at: Rivard Buick GMC, Tampa, Florida, Phone # 813-620-6500 The Grille was inspected and repaired with adhesive to reinforce the plastic tabs to the grille so it would not detach and cause a safety issue when driving. This recall was performed before we purchased the vehicle and we are located in Oklahoma City, OK. The vehicle has been listed for sale at our car dealership in Oklahoma City and had to have multiple Warranty Repairs at GMC/Chevy over the summer. We Sold the vehicle on [XXX] to a customer: [XXX] and he was driving the vehicle and the Grille detached and fell off the vehicle while driving. The Grille hit his hood and windshield and caused damage. He could have had an accident when the grille detached from the front of the vehicle. We dropped the vehicle off at Bob Howard GMC on 8/26/25 and they said since the recall has been performed that it is not covered and nothing they can do about fixing it under Recall or Warranty. We reached out to GMC Customer Service 1800 # and they told us the same thing, and we would have to repair it out of pocket. I find this extremely unprofessional and avoiding taking care of the issue that should have been taken care of the first time. The part is faulty and part of the Recall to be repaired or replaced properly so this hazardous part does not cause a problem while driving and that is exactly what happened even after having the recall taken care of at GMC. We at La Raza Motors Inc. have inspected the vehicle/Grille and upon discovering the previous recall/repair that was performed at Rivard Buick GMC in Tampa, Florida, the Grille was not properly repaired and not up to standard. This part should have been replaced instead of repaired. [XXX] retrieved the broken/detached Grille after it detached to see what had happened and we have pictures. No police report was made at the time of the incident. No lights or warnings were on at the time of the incident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683304August 26, 2025
ENGINE, FUEL/PROPULSION SYSTEM
My 6.3l v8 Started having a slight misfire while driving. Took vehicle to a mechanic and was advised to change the spark plugs, changed spark plugs, spark plug wires, and ignition coil packs while still experiencing sudden misfires while driving. Starting to consider the 6.2L L87 collapsing cylinder issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682879August 25, 2025
SERVICE BRAKES, STEERING, ELECTRICAL SYSTEM
Was driving down the freeway around 65 miles an hour attempted to pass a truck when the steering started wobbling the ABS that EMS and the breaking system came on with the check engine light almost had no control and barely avoided having an accident the only way it went back to normal was slowing down.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682921August 25, 2025
ELECTRICAL SYSTEM:INSTRUMENT PANEL:SPEEDOMETER/ODOMETER
Odometer Fraud. The contact purchased a 2008 GMC Sierra 1500. The contact discovered a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 126,498. It was later discovered that the mileage on the title was approximately 250,205.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683027August 25, 2025
POWER TRAIN
My rear wheels randomly lock up and truck violently shakes. It does it randomly in very long trips so GM and every dealer I've brought it to just says that "they cant help me because they cant get it to replicate. Had the same issue with my 2020 and it has an open recall for the exact same thing. This is very dangerous and is going to get someone hurt one day if gm isn't help responsible and fixed their valve body failures for ALL of the 10L1000 L5Ps. Not just 2020-2022....it's ALL OF THEM. 2020-2025!!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682678August 24, 2025
ENGINE, UNKNOWN OR OTHER
I’m filing this safety complaint in addition to a previous complaint, 11678151. which occurred on August 1, 2025. On Friday, August 22, 2025, I experienced a 2nd Traction Control alert and engine failure lights on my 2026 Sierra Denali Ultimate truck which again caused the acceleration to drastically decline while driving home from work. Thank God my kids were not in the car with me this time. I am extremely appalled and confused as I've NEVER experienced this level of substandard operation from a new vehicle. I have informed the leadership team team at Cavender GMC West San Antonio, TX of the situation. The dealerships recommended (2) paths to exit the vehicle: GMC Customer Assistance and dealership trade-in.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682686August 24, 2025
ENGINE
The recall is showing complete in May 2025 but oil and filter plus new oil cap not changed or replaced. I bought the truck on June 25, 2025 from Enterprise Car Sales and was not informed about the engine of this truck was on a recall lised but have been completed. I feel unsafe driving this truck now.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682558August 23, 2025
STRUCTURE:BODY
The front upper grille deflector/hood bulge flew off randomly while driving. No signs of it previously detaching or anything. Just came off.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682574August 23, 2025
POWER TRAIN
My truck is currently experiencing shuddering when driving. This happens at random times but is becoming more frequent. I have taken it into service shops on numerous occasions, and they have not been able to identify the cause due to my truck not exhibiting these conditions when they are diagnosing it. I have run out of funds to continually pay for diagnostic fees, so I have had to let it go until recently. Now it shudders, shifts very harshly, rpms fluctuate continuously, knocking noise when driving, and in the mornings when I first leave for work, my truck will not shift out of first without revving high in rpms. I took it to a mechanic and was told that it was my torque converter, which has now damaged my transmission. All of which I have to pay for out of pocket. These symptoms started when my vehicle was still under warranty (around 30,000 miles). I even flushed the transmission, and it did not help. This is my daily driving truck, and I use it to go to work and transport my 3 young children around. Most of our driving is done on the highway at high speeds (70 mph). When my truck shudders or shifts harshly, I feel that it is going to cause me to lose control or wreck, putting not only my life but my children's lives in danger. I have not consulted a lawyer, as I do not have enough money to do so. I have not had the manufacturer look at it, because when I called about it, they told me I would have to pay for all service fees since it is out of warranty. The only warning lamps I get is when it goes into limp mode (which is at least once or twice a month) and by the time I used to get it to a mechanic, the light was off and they said there is nothing they could do about it. All of this has been happening to some degree since it was around 30,000 miles and only getting worse. The fact that I have put over $20,000 into this (not including my monthly payments of $990) and now have to replace the transmission & torque converter is ridiculous.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682601August 23, 2025
UNKNOWN OR OTHER
The coolant sensor was faulty and required a replacement coolant reservoir. No cause for this provided other than it went bad.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682307August 22, 2025
ENGINE
Engine failure; according to GM Mechanics, the lifters failed and this resulted in a broken push rod. Vehicle is now waiting for a new engine; $8,882.00 out of pocket from owner, because current recall does not include the 2019 or 2020; only the 2021 and newer of the same enginee, with the same exact failures. Vehicle has under 75,000 miles and has been serviced for oil change and engine maintenance at GM dealership since purchased. Several different mechanics, on with over 40 years of GM Engine experience, have evaluated the engine all deeming the same failure. Dealership confirms that there is a 6 to 8 week lead time for the new engine because, quote, "there are so many being replaced for the existing recall". I received no warning from the vehicle systems, no information from the local GM dealership or any other communication that my vehicle was at risk for this failure. I am without a vehicle for likely 2 months and will be 'out of pocket' almost $9,000.00 when this is done. This is my second Sierra Denali 1500 in the past 10 years, and my >10th GM vehicle to own, and for the 'Premium Pick-up Truck' on the market, I have always expected the finest quality and service, and this situation changes everything.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682328August 22, 2025
ENGINE AND ENGINE COOLING
See attached document for complaint. Text from attached document: Unacceptable delays in repair: We have contacted 2 local dealerships, both of which have informed us that the necessary parts are unavaila ble and cannot provide a clear time line for when repairs will be completed. Leesburg Buick GMC Hummer (Country Buick GMC at time of vehicle purchase) Joyce Koons Buick GMC (Service Manager: Michael Nguyen) • Poor communication from GM: We have received no follow-up communication from GM regarding the status of the recall or expected resolution. We have contacted GM twice by phone using the number provided in the recall notice. During the first call, we were transferred to a dealer in Arizona- despite resid ing in Virginia. On our second call, on 8/2, we were informed that our case had been escalated and that we would be contacted within 24-48 hours. As of now, we have not received any return phone call. • Ongoing safety concerns: We are unable to drive the vehicle due to the risk of engine failure, which compromises our safety and that of others on the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682425August 22, 2025
ENGINE, PARKING BRAKE
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving on three occasions and stopped, the vehicle started shaking abnormally. The check engine warning light was illuminated, and the message to "Check Parking Brake" was displayed. The contact engaged and disengaged the parking brake. The vehicle was taken to the dealer where it was diagnosed and determined that the lifers and cam shaft needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 74,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682446August 22, 2025
POWER TRAIN
The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed toward the residence, the accelerator pedal was depressed and traveled to the floorboard, and the vehicle failed to drive forward as intended. The vehicle started rolling backwards and the contact carefully maneuvered the vehicle while attempting to park. There was no warning light illuminated. The vehicle was towed to the dealer and diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 101,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682073August 21, 2025
AIR BAGS
I have contacted Blaise Alexander in muncy pa 17756 in 2020 or 2021 and they told me that the part was on back order they would contact me when the part has come in 5 years later they still have not contacted me I have reached out by phone through email and Facebook messenger to set up a time to fix my 2008 gmc sierra and haven’t heard anything well last week my service air bag soon light came on and I am very nervous about that so I will not drive the truck I would like to file a formal complaint and have this taken care of please
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682085August 21, 2025
ELECTRICAL SYSTEM:INSTRUMENT PANEL:SPEEDOMETER/ODOMETER
Odometer Fraud. The contact purchased a 2012 GMC Sierra 1500. The contact stated that it was discovered that there was a mileage discrepancy. The vehicle was a private sale. At the time of purchase, the mileage was 111,000, and at the time of registration, it was discovered that the mileage was 243,000. The Carfax Report indicated that the vehicle was serviced at 149,000 and 179,000 miles, then registered at 149,000 and 179,000 miles on August 8, 2024. The contact had filed a police report with the Dillon Police Department -Special Ops Police Department.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682108August 21, 2025
SERVICE BRAKES
We noticed that the brakes were really soft. We literally had to push on the brakes with excessive force. We took it to Lynch - West Bend, WI for a service call and was told that nothing was wrong with it. After leaving the dealership we did our own research (the hubby is a certified master technician himself). Come to find out through GM, contacts through TBM brakes and Duramax Forum.com "brake pedal effort" we found the issue and a solution and we fixed it ourselves. This truck is brand spanking new and the dealership threw their hands in the air with a safety issue and let us drive out of the parking lot. Imagine driving away after being told no issue to end up in an accident due to failed brakes. Who's to blame for that? Certainly not the customer. It was only when the new car sales manager took the truck for a drive, he agreed that there was a problem. - too late we took it home and fixed it ourselves. This problem needs to be looked into seeing its a known issue!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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