GMC Sierra Complaints

15,732 consumer complaints on file.

#11570915February 8, 2024
ELECTRICAL SYSTEM
Purchase new in Sept 2022. I did not notice that my trailer hitch Connector was not working until after a year later. when i needed to hookup my enclosed car hauler trailer. And notice that my trailer daytime running lights where not working. Only brakes/,turn signals and four way flashers. I contacted my dealer and again they found no issues with the factory harness. leaving me on the side of the road until morning. As i had no running lights. After arriving back home. I crawl under the rear bumper. just to check the connections. I could not see anything nor would i know what to look for. I called another Gmc dealer and they mention that they been having problems with the module for the factory trailer connector. Still having issues
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570621February 7, 2024
SERVICE BRAKES
At low speeds I have no brakes.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570651February 7, 2024
ELECTRICAL SYSTEM
While driving the entire dash cluster (speed,rpm etc) turns off entirely, reloads as if truck is just starting with all lights coming off and on, needles cycling max/min. Unable to recreate on command, multiple others reported same issue with no cause/cure listed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570194February 6, 2024
ELECTRICAL SYSTEM
Vehicle will not start due to known GM issues. This failure left my family stranded in cold dark unsafe area once already. If we were in the flow of traffic or had to leave an area immediately we would have been unable too. Known GM issue, engine fault code P12A6 fault code. Bulletin: PIP5719A discusses this issue. I am being told by the dealer there is a newer bulletin which advises ECM update. GM dealer is stating ECM software upgrade is required to resolve at owners expense. Owner is responsible for diagnostic fee in addition to repair costs. If the issue is not resolved vehicle may continue to experience starting failure and or other electrical problems. The night the vehicle left us stranded instrumentation was erratic and not reading properly on the instrument cluster. Very unsafe and GM should reach out to customers to inform them a software update is needed and it should not be at the expense to the consumer if the consumer is out of the bumper to bumper warranty.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570204February 6, 2024
UNKNOWN OR OTHER
Like many of the 2014 and 2015 models, my vehicle has experienced the exact same failure in the radiator due to the thermostat over cycling. There is already a TSB for those models, yet GM changed nothing in the subsequent models and the problem persists.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570239February 6, 2024
ELECTRICAL SYSTEM, STRUCTURE:BODY
Tailgate occasionally self deploys. 1 incident resulted in damage to the tailgate while towing a trailer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570305February 6, 2024
SERVICE BRAKES
CRITICAL PART FAILURE - The master cylinder attached to the brake pad is leaking at the seal where the piston is depressed into the cylinder. It's leaking brake fluid onto the driver brake assembly and some sort of cable. While this is repairable under warranty, this should NEVER ever happen on a vehicle. Arguably, the main part on the most critical system on the car - the brakes. Please investigate whether GM should be responsible for replacing this part on any affected vehicle for the life of the vehicle Thank you for all you do to keep us safe! Have a great day
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570338February 6, 2024
ELECTRICAL SYSTEM
The tailgate is opening on it's own. There have been many times it has been open and we were not aware until we go to the back of the truck or put the truck in reverse and notice it on the backup camera. We first noticed it happen around Christmas of 2023, and it has been happening randomly since then.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570086February 5, 2024
POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER
The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle experienced severe transmission shudder and was vibrating while driving up inclines. The vehicle was taken to the local dealer who diagnosed that the transmission torque converter was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure. The failure mileage was 80,000. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569648February 3, 2024
STRUCTURE:BODY
The back window leaks, I brought it in they told me it wasn't warranty so I paid to have it fixed. Still leaks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569714February 3, 2024
SERVICE BRAKES
Lost break, second time this month, showing break failed 40 mph max speed, abs light on, break light on, and 2 more light on the car with antislipiring or something like that, the another one no idea what it is
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569422February 2, 2024
SUSPENSION, POWER TRAIN
The component or system failed was the transmission 4 different times. A new transmission was put in the car just 6 months after purchasing from a dealer. The transmission lasted close to 3 years being shy only a few days before the transmission warranty expired. So a new transmission was provided by the transmission owner at no additional cost for the transmission but we had to pay $1600 out of pocket for labor. That transmission lasted for 2 months before failing again which caused us to have the truck towed to our home to decide what our next step would be. So we had it towed to Tire max and they put in another transmission by the same manufacturer which we only had 2 days left under the warranty. That transmission failed within 2-3 days so we took it back to a different Tire Max location and they put in another transmission which did not cost anything for us by the manufacturer including labor. This transmission has now been in good standing since 12/20/23.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569499February 2, 2024
ELECTRICAL SYSTEM
[XXX] has a trailer brake control module issue that causes the trailer brake to periodically disengage and reengage. Unfortunately, I had to drive across the country on a military PCS move with this intermittent failure. GMC has provided numerous surveys to ask about my experience with my new GMC. Overall, the vehicle adequate, and in each survey I have annotated this issue. However, it does not appear the issue is being taken seriously as I have not seen a recall. A trailer brake that intermittently fails is extremely dangerous. 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
#11569555February 2, 2024
ENGINE
The contact owns a 2015 GMC Sierra 1500. The contact stated while his daughter was driving approximately 25 MPH, the vehicle started vibrating violently. The contact stated that his daughter reported seeing several unknown warning lights illuminated. The vehicle was stopped and towed to a dealer. The dealer diagnosed and determined that the rod bearings were damaged and caused damages to the lifters. The contact was informed that the rod bearings and lifters needed to be replaced. The vehicle was not repaired. The manufacturer was informed of the failure. The contact researched online and related the failure to Technical Service Bulletin: 20-NA-038 (Engine). The failure mileage was approximately 43,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569219February 1, 2024
ELECTRICAL SYSTEM, SEAT BELTS
The contact owns a 2015 GMC Sierra 1500. The contact stated that while starting the vehicle, there was no audible chime or alert heard. After driving and then restarting the vehicle there was still no audible sound from the electrical system. There were no warning lights illuminated. The vehicle was taken to the local dealer, who informed the contact that the battery needed to be replaced. The vehicle was not diagnosed or repaired. The contact replaced the battery, but the failure persisted. The manufacturer was not notified. The contact stated that the failure was related to NHTSA Campaign Number: 14V301000 (Electrical System, Seat Belts) however, the VIN was not included. The failure mileage was approximately 75,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569266February 1, 2024
FUEL/PROPULSION SYSTEM
Bosch CP4 fuel pump failure that shut down vehicle while driving, luckily did not cause an accident. Would not restart. Damaged entire fuel system including injectors and now have $17,000 in damage that needs repaired.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11569113January 31, 2024
UNKNOWN OR OTHER
The driver's side floor mat will not stay in place because the device that is supposed to hold it in place is broken. The floor mat is now able to move forward and interfere with the function of the brake and/or accelerator. Both the dealership (Castle Rock GMC, Colorado) and GMC Customer Care (Case #: 91-11325687695) have ignored all requests to address this and other issues. I have also written letters to GMC Corporate and the Castle Rock GMC General Manager, both of which were also ignored.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11568867January 30, 2024
UNKNOWN OR OTHER, STRUCTURE:BODY
The tailgate latch is not waterproof, and opens on its own sometimes. this can allow things to fall out of your truck.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11568278January 28, 2024
POWER TRAIN
I have been experiencing ongoing issues with the transmission of the vehicle I purchased in 2018. Despite it being a brand new vehicle with only 10,000 miles, I have had to bring it back to the dealer multiple times for transmission-related problems. We have tried changing the transmission fluid periodically to address the issues with shifting and shuddering, but the problem has persisted throughout my ownership.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11568185January 27, 2024
EXTERIOR LIGHTING
Both headlamps stopped working when driving at night. Neither the low or high beams will work
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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