GMC Terrain Complaints (2018)

226 consumer complaints on file.

#11618985October 9, 2024
ENGINE
The contact owns a 2018 GMC Terrain. The contact stated that while driving at an undisclosed speed, the vehicle stalled. There was no warning light illuminated. The vehicle was restarted; however, the failure recurred. The vehicle was taken to an independent mechanic where it was diagnosed that the vacuum pump had failed and needed to be replaced. The vehicle was not repaired. The vehicle was taken to the dealer where it was diagnosed that the vacuum pump had failed and needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 121,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11618092October 4, 2024
SERVICE BRAKES, ENGINE
While driving the vehicle the vacuum pump failed and caused the camshaft to seize and physically break which caused the break peddle to become hard and breaking the vehicle was limited and almost nonexistent, which caused an extremely dangerous situation on the highway.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11617658October 2, 2024
SEAT BELTS, AIR BAGS
The "Service Safety Restraint System" warning light appears on the dashboard and warning chimes continually sound. To my knowledge GMC had a recall for this in 2018. I purchased the vehicle in 2021. I contacted GMC and told them this issue and they informed me that there are no recalls on the vehicle. My concerns being that airbags are fully functional.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11617538October 1, 2024
ENGINE
The contact owns a 2018 GMC Terrain. The contact stated that while her husband was driving 30 MPH, the message "Engine Power Reduced" was displayed and the vehicle stalled. The vehicle was not able to be restarted. The contact stated that the vehicle was coasted off to the side of road. The vehicle was towed to the residence and then to a dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 92,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11616710September 26, 2024
SERVICE BRAKES, ENGINE
In 2022 and now in sept of 2024 my entire braking system has failed. Cause you a complete in abilty to stop the vehicle. Upon this failure without any warning peice of the braking system connected to the engine shoots shrapnel into my engine and causes the cam to be destroyed. Now I can't get my car back because of a shortage on this part.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11611189August 27, 2024
ELECTRICAL SYSTEM:HORN
The contact owns a 2018 GMC Terrain. The contact stated while driving at an undisclosed speed, the contact became aware that the horn was inoperable. There was no warning light illuminated. The vehicle was taken to the dealer. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11610469August 23, 2024
SERVICE BRAKES
Brake pump keeps going changed in the last 2 week and over in the last 2 yrs 3xs and burning oil.brakes get hard while driving which is dangerous.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11607419August 8, 2024
FUEL/PROPULSION SYSTEM, POWER TRAIN, VEHICLE SPEED CONTROL
Hello. As I come to a complete stop the car will go into auto-stop. After releasing the brake pedal the car will jerk forward . As I press the gas pedal the car Jerks and shakes . The rpm jumps way up and the mph say low.. there's been times I try to accelerate and the car with jerk and put itself into park.. in the middle of traffic.. heart pounding to say the lease. I also notice theres alot of black liquid dripping for the front right side under the front bumper. There were no problems with the car or lamp indicating there were before this. I went to where I brought the car and they told me my warranty expired and that I will need to pay $265 just to diagnose the issue. I didnt have that money. I do have a car code reader and I did my best to find a solution. Codes P0700, P171D, And P187D all appear on my device. I then looked up recalls and my VIN wasn't confirmed.. but I am certain it is the same issue . You do have a open recall for this very particular issue for my particular model . I love my car and GMC. Please remedy this situation and have me driving safely and free minded again and soon ! Please reach back with any feedback as soon as possible. Thanks !
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11606707August 6, 2024
VISIBILITY/WIPER, FORWARD COLLISION AVOIDANCE: WARNINGS
The headliner fabric detached somehow from the panoramic track causing the fabric to hang down obstructing the rear and back window view causing a safety hazard. The automatic forward collision alert will come on for no reason since this has happened. The problem has not been reported to insurance or the manufacturer yet but GM is my next call. This is a safety hazard due to the obstruction of visibility to safely make turns or change lanes. This happened August 5th while driving with the windows up. It just dropped down still attached to the front of the track and the rear.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11605416July 30, 2024
ENGINE
The contact owns a 2018 GMC Terrain. The contact stated while driving 45-50 MPH, a message indicating that the engine was not at full capacity was displayed. The vehicle was taken to the dealer, where it was diagnosed that the engine had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 342,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11605419July 30, 2024
SERVICE BRAKES, HYDRAULIC
The contact owns a 2018 GMC Terrain. The contact stated while driving approximately 70 MPH, the brakes inadvertently activated. There was no warning light illuminated. The vehicle was not drivable and was towed to the residence. The vehicle was then towed to an independent mechanic to be diagnosed. The contact was informed that the vacuum pump needed to be replaced. The vehicle was repaired; however, the failure persisted. The contact had the vehicle repaired several times; however, the failure persisted. The contact was also informed that the rotors needed to be replaced after the vehicle had been repaired several more times. The manufacturer was not notified of the failure. The failure mileage was unknown.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11604413July 25, 2024
ENGINE, SERVICE BRAKES
The vacuum pump gears for the brake assist was shattered and metal parts were sent into the engine. I lost power brakes and was lucky to be able to stop the suv. The car was towed to a GMC dealer where it was diagnosed with a damaged exhaust cam, a shattered vacuum pump and metal pieces in the motor. Cost to fix $3200. This is a 2018 GMC Terrain with 112000 miles on it. I had a powertrane plus warrenty that was still valid but they refused to pay for anything. They claimed the vacuum pump caused the problem and it was not the engines fault. There were no warning check engine lights before this happened.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11603299July 18, 2024
FORWARD COLLISION AVOIDANCE: WARNINGS
I was in a car accident
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11594454June 14, 2024
ENGINE, UNKNOWN OR OTHER
The car very suddenly went into a reduced engine power mode, with check engine light and was immediately parked. Figuring I could turn the car off and turn it back on, however it sputtered turning off and shook violently before I was able to turn it off. It would then not turn back over, so I left it off and had a tow truck drive it to a GMC mechanic. The GMC mechanic was unable to diagnose an issue after days. I then had it towed to another local mechanic who stated the parts were "junk" and the engine needed to be replaced. Engine codes were related to the camshaft sensor and brake booster. It is my understanding the vacuum pump broke off into pieces, went into and destroyed my engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11593933June 12, 2024
SERVICE BRAKES
Vacuum pump is in the shop now being replaced for the 7th time in almost 6 years. The previous one was replaced in September 2023. You get no warning signs, then all of a sudden you can barely press down on the brake pedal. This started within the 1st year of purchase.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11589103May 16, 2024
SERVICE BRAKES
I was driving down the highway between 65 and 70 MPH. The semi-truck in front of me almost missed his turn and stopped quickly to make a 90 degree turn off the highway. I went to slow my vehicle appropriately, and my brakes did not respond. I had no warning that my brakes were compromised. I quickly used the downshift button to use my engine to slow me down and I crashed my vehicle off the road into the sagebrush (luckily no trees and there wasn't a dramatic drop off). At that time, after my vehicle came to a stop, I received a warning on my dash that stated "service brake assist". I looked up the issue on my phone to see what may have happened, and read that GMC had a recall for this very issue. I contacted the dealership and they indicated that they were aware that the 2018 GMC Terrain has this issue, but it was not included in the recall. I am traumatized by this incident. I am a very experienced driver, but I had bought this vehicle for my daughter, had she been driving, this would have been a catastrophic accident. I have nightmares about if this had failed when approaching a crosswalk or in a school zone. If GMC is aware of the problem, and they had a full recall on this on other models with this same problem, why aren't they fixing the Terrain, why are they waiting for a fatality. It is unacceptable, dangerous, and I don't even want to know what the cost is going to be to repair the vehicle. I am thankful it wasn't much worse.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11588585May 13, 2024
SERVICE BRAKES, ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Safety was put at risk when brakes went out without warning, and unable to use emergency brake at that time. Car was serviced for over $1700, with the mechanics stating that the piece “blew up.”
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11587349May 7, 2024
SERVICE BRAKES
The brakes stop working, they get really stiff and locks in the middle of the highway, very hard to stop and almost caused an accident, it is not the first time, the vehicle was serviced by an authorized mechanic and the problem had been resolved until today, the brakes locked and almost caused me to loose control of the vehicles brake system.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11582931April 14, 2024
UNKNOWN OR OTHER
The clips popped off or something happened and now the headliner is hanging and I can't see out the rear view mirror. It's a hazard for anyone sitting in backseat. I've had it in 2 different shops .needs to be a recall because I've read several other people having this issue
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11581218April 4, 2024
SERVICE BRAKES, ENGINE
While driving on the interstate the brakes all the sudden stopped working. I was able to stop the vehicle by pulling over to the shoulder of the road. I received a warning saying service brake assist and a check engine light after the brakes went out. The vehicle later shut off and is no start with no warning codes. I am currently towing the vehicle to a mechanic. Several people claim to have the same issue online stating that it is an issue with the brake vacuum booster shearing off in the exhaust cam which then causes major damage to the engine. It appears the same issue exists with several other GMC models that were already recalled
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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