GMC Sierra Complaints (2018)

371 consumer complaints on file.

#11497704December 16, 2022
SERVICE BRAKES
I purchased this 2018 GMC pickup in May 2021. Starting in Nov 2022 I started getting a sporadic SERVICE TRAILER BRAKE SYSTEM warning light and chime. I have never towed a trailer using this trailer brake system on the vehicle, but the warnings come on sporadically. I have done some research and found this is not an isolated case as others have reported the same problem. Some owners have replaced the dashboard controller at their own expense, however this is now a well documented problem that goes beyond an isolated case. This is a defect of the trailer brake controller and should be recalled by GM at GM expense. It is a hazard to driving when the visual and audible chime come on sporadically. It's a distraction to safe driving and requires immediate intervention. I did advise my local dealer of the problem when the vehicle was serviced Dec 2022, however they did not have a technician available to work the problem. So I continue receiving the visual and audible warning every time I drive the vehicle. Please highlight this problem within your organization for a possible safety recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11497769December 16, 2022
POWER TRAIN
The contact owns a 2018 GMC Sierra 1500. The contact stated while driving 50 MPH, the vehicle started shaking and vibrating abnormally. There was no warning light illuminated. The vehicle was taken to the dealer to be diagnosed. The contact was informed that the transmission oil needed to be flushed. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was 71,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11496886December 10, 2022
UNKNOWN OR OTHER
Sunroof shattered while driving on the interstate
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11494999November 26, 2022
FUEL/PROPULSION SYSTEM
Gas leak. My 2018 gmc sierra 1500 has been giving me two codes for evap leak small and large and i notice a black spot on my drive way under the gas tank wich in fact was gas. I can see the gas tank is wet but it comes from the top part of the gas tank. I been looking for recalls on this but there isnt any for this specific year of GMC sierra 1500 slt.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11494542November 22, 2022
POWER TRAIN, TIRES, SUSPENSION
The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at an undetermined speed, the vehicle was shaking while shifting gears. The contact stated while shifting from four cylinders to eight cylinders, the rear-end was shaking violently. The hood latch warning light was illuminated. The vehicle was taken to the local dealer where it was diagnosed and determined that the tires needed to be replaced. The tires were replaced three times however, the failure persisted. The manufacturer was not contacted. The failure mileage was approximately 50,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11491986November 2, 2022
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Water leak, known in other years of the same model vehicle, caused the rear defrost to fail and smoke when in operation nearly causing a fire in the vehicle as it was being operated.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11491523October 30, 2022
SERVICE BRAKES
Breaks are not working
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11491315October 28, 2022
STEERING
The contact owns a 2018 GMC Sierra 1500. The contact stated that while pulling up to park the vehicle at approximately 2 MPH, the power steering failed causing the contact to use an excessive an extra amount of effort while maneuvering the steering wheel to park the vehicle. The power steering assist warning light was illuminated. The contact took the vehicle to the dealer to be diagnosed. The contact was informed that the steering assembly and steering gear needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure and filed a case. The approximate failure mileage was 39,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11486643September 27, 2022
POWER TRAIN
Experienced heavy vibration or shudder through transmission once fluid got to around 145 degrees. Also transmission has rough shift on the first shift of a drive cycle. When I started to research I found many of the same issues reported with 8 speed transmissions. I’ve also read about the issues with the lifters not working for the active fuel management system though I haven’t experienced that yet. The replaced my transmission fluid at the dealership under the powertrain warranty. This issue showed up at around 35,000 miles, so I am very worried about the safety and reliability of this engine and transmission.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11484882September 16, 2022
UNKNOWN OR OTHER
In short, the moonroof of my vehicle spontaneously exploded into a million pieces one morning while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11484365September 14, 2022
SERVICE BRAKES, ELECTRICAL SYSTEM, ENGINE
While driving 35 miles per hour in the early morning hours I came to a 4-way intersection and applied the brakes slowly. Suddenly, I lost all power in the brakes and the steering wheel locked up. The lights, and stereo remained on, and my dash board display immediately showed a red check engine light. I immediately turn on my hazard lights, turned the ignition key off and tried to restart the truck. There was no clicking sounds. The truck would not start but the lights dimmed and the dash display now showed an intermittent yellow, flickering check engine light. After roughly 30 minutes while waiting for AAA to arrive I tried the ignition key and the truck started up with a red check engine light. Rather than attempting to drive I had AAA tow my vehicle to the Chevrolet dealership where I purchased the truck.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11484121September 12, 2022
STEERING, SUSPENSION
My truck has a severe vibration or shake extremely bad at 60mph and up.i have tried new tires, front end alignment, and several different shops have told me they don't know what it is drive shaft or axels
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11483250September 7, 2022
UNKNOWN OR OTHER
Air conditioning condenser failed at about 48,000 miles. Seems to be a common problem that is a design defect.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11483283September 7, 2022
SERVICE BRAKES, UNKNOWN OR OTHER
Received an error on the dash saying "Service Brake Assist". At the same time the brake pedal became very stiff and braking power was decreased significantly. I have received this same message and brake pedal stiffness with reduced braking power three times in the last 4 days.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11482527September 2, 2022
POWER TRAIN
Transmission System, hard shifts and shaking causing vehicle to down shift hard and throw itself forward almost causing an accident when coming to a stop, when vehicle was taken into service they did not diagnose the vehicle for this problem, while driving vehicle shifted down so hard causing vehicle to be stuck in only 1st gear and would not shift out of 1st gear
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11481640August 28, 2022
SERVICE BRAKES
The service alert for the trailer brakes keeps going off constantly and continues to go off persistently almost making the vehicle undriveable. I was informed to file a complaint with your company by my local dealership as this is a recurring issue with GMC trucks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11479416August 15, 2022
SERVICE BRAKES
*A message and alarm kept going off on our truck "Service Trailer Brake". We are not towing a trailer, nor had we had a trailer hooked to this vehicle since 2019. It began only going off occasionally, but within a few weeks it was going off constantly. It would show repeatedly on the dash and the alarm would sound over and over. Trying to turn off the system was not successful, no matter how many times we hit dismiss. It was totally distracting and worrisome that something was wrong with our braking system in general. *The constant alarm and dash display made driving a very distracted experience. It is so loud that you cannot hear other outside noises. We were also concerned about the safety of our regular braking system. *I called the dealer where our truck is regularly serviced. They immediately said "Is it the Trailer Assist Alarm?," so it was obvious that this is happening to other owners regularly. It took several days to get in for an appointment. The shop mgr helped us to locate and pull the alarm fuse to stop the noise, so we could drive it to the dealership later in the week. The display was still going off when I pulled the truck into the dealership, as it has done all the way there (17miles from my home). *It was inspected by the GM dealership (Schwarz, INC. Honesdale, PA) and the defective switch was replaced at a cost to us of $127.14 on 08/11/2022. *This issue started several months ago (Feb 2022?), but it was a one time thing. So, we thought it was just a fluke. Then, a month or so ago it started again, but was happening only once or twice and would then disappear for days. Then, 2 weeks ago it began to happen continuously.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11479427August 15, 2022
SERVICE BRAKES
I am getting a service alert for the Trailer Brake System. It is constant and loud and distracting and a significant safety hazard, not only because of the distraction, but also because it renders trailer brakes completely useless
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11477417August 3, 2022
VEHICLE SPEED CONTROL, ENGINE, FUEL/PROPULSION SYSTEM
THE SPEED OF THE TRUCK WILL NOT INCREASE. THE RPMS GOES REALLY HIGH AND THE TRUCK WILL NOT MOVE INTO THE NEXT GEAR. THE REAR END OF TRUCK VIBRATES. I TOOK THIS TO THE DEALER AND WAS TOLD IT IS THE TRANSMISSION FLUID IS FAULTY. THE CHECK ENGINE LIGHT DOES COME ON. I DID NOT HAVE THE NEW TRANSMISSION FLUID CHANGED BECAUSE DEALER SAID IS COST $300 FOR THE FLUID AND $100 FOR THE LABOR AND $168 FOR THE DIAGNOSTICS. SO I STILL HAVE THE SAME PROBLEM. ALSO TOLD YOU CAN NOT PURCHASE THIS TRANSMISSION FLUID NO WHERE BUT GMC.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11474421July 18, 2022
UNKNOWN OR OTHER
Constantly getting “service trailer brakes system “
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

← Back to GMC Sierra