GMC Terrain Complaints (2019)

187 consumer complaints on file.

#11685543September 7, 2025
SERVICE BRAKES, ENGINE, UNKNOWN OR OTHER
Two weeks ago I was driving on the highway. My car felt fine. No warning light the dashboard. Suddenly I receive a notification on my dash stating “engine speed reduced” and my check engine light went on. My car at this point still feels fine, not shaking, no smoke, etc. I’m on the highway and not in a safe position to pull over. 2 minutes later I receive another notification on my dash stating “service breaks”. I immediately tap my brakes to check and they are stiff. I let off the gas as I was approaching the exit and begin pumping my brakes. They continue to be stiff. Luckily there was no one I front of me as this exit led to a rotary. I was able to coast around the rotary and into a parking lot where I attempted to push the E- break which did not work. My steering tightened and then my car died. I have the car towed to GMC where I bought the vehicle. Am told I will be charged a diagnostic fee and they will let me know what they find before repairs are made. I receive a call back the following day stating “the vacuum pump exploded causing you to loose brakes”. I was told “the vacuum pump and repairs would be about $1,200. BUT they could not guarantee that once the vacuum pump was removed, there wouldn’t be more debris and destruction to the cam shaft and engine”. We asked they continue with the diagnostics and check the engine for debris. We receive a call back stating “the vacuum pump exploded and there are shards of medal debris in your engine”. Recommendations are that I need a new engine as "the vacuum pump explosion caused catastrophic damage to the engine". My safety and the safety of other innocent drivers on the highway were put in extreme danger! I lost all break control, power steering, and emergency break control. I had minutes from the time the first warning alerted to the time I lost complete control of the car. This is a known issue with GM Motors specifically made between 2016-2019.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684171August 31, 2025
ENGINE, FUEL/PROPULSION SYSTEM, SERVICE BRAKES
While driving the vehicle the car went into limp mode and the back brakes stopped working. The car had to be drifted into a parking lot. The vacuum pump malfunctioned and has damaged the engine. If it was me in the driver seat instead of my partner, the incident would’ve 100% been an accident. The car was really unable to be controlled and we just happened to have that space that was empty to turn into. The car gave code when this happened. When getting a tow the car also wouldn’t take itself out of park or start to go into neutral to move the car to get it towed. Nothing is working with each other anymore and we were on a busy road of people when our brakes just went out.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11682782August 25, 2025
POWER TRAIN
The GMC Terrain P187E transmission code indicates a problem with the transmission senor or shift interlock. It prevented our car from shifting into park. The car won't start now. We had to disconnect the battery because the car would not stop beeping. Milage is only 22000 miles and we have owned it for less then 2 months. It is a 9 speed transmission which I understand this to be an on going issue with this transmission.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11680816August 15, 2025
SERVICE BRAKES, POWER TRAIN, ENGINE
Brake vacuum pump premature failure. As you see GMC, terrains, in Equinox, I have an issue, while the engine it's on while driving etc, if this bark fails, you will have an issue I'm trying to stop. This is a known problem or GM. And as of now, they have not come out with a solution or a recall for this problem. This problem has caused many customers. To lose thousands of dollars, he repairs. I'm not covered by the warranty. This should be addressed and repaired as soon as possible as it may cause someone else to lose their life. Second problem is the 9 speed transmission transmission lack power when trying to gain speed as you enter the highway. Lastly they blamed the selenoids etc. Lastly the pulley belt retention broke down premature with only 68k miles. This is an ongoing problem gm is well aware and tries to hide or fix. When someone buys a vehicle we expect to last longer than 100k miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11681006August 15, 2025
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
Back up camera just started showing a blue screen with message that stated service back up camera. No accident, has not been to dealership. Just started 8/15/2025. No warning given.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676573July 28, 2025
SERVICE BRAKES, STEERING, VEHICLE SPEED CONTROL
Friday July 25, 2025 I was driving my 2019 GMC Terrain SLE and when exiting the interstate the brake pedal got hard and I could not stop. After almost rear ending another vehicle, I got the vehicle into the ditch and safely off the road. After several attempts to correct the problem, I was unsuccessful. The vehicle was towed home and seen by a mechanic. The vacuum pump went out while I was driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11675123July 21, 2025
ENGINE
I was driving this morning and my car put itself in neutral. I think had to pull off to the side because it was not accelerating. I could get it to go over 20 mph. Every time I tired to accelerate. The engine would feel forced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11671877July 8, 2025
POWER TRAIN, SERVICE BRAKES
Accelerating from a stopped position into a busy intersection heard a loud clunk come from engine bay resulting in immediate "Reduced engine power" warning and stall condition. Was able to push vehicle onto the side of the road. Engine would not restart and a tow truck was called. Vehicle towed to local dealership who discovered that Vacuum Pump had failed resulting in sheering off of the exhaust camshaft. Dealers recommended fix was to replace vacuum pump and camshaft at around $4,000 but could not guarantee no debris had gotten into valve body resulting in engine failure so stated they could replace with used engine for 8500. Second vacuum pump to blow on this vehicle, first at 35k miles and replaced under warranty, this incident at just under 80k miles. Could not afford repairs and vehicle has sat for nearly 2.5 years. Contacted GM many times over that time period to get no assistance, only the offer of a small discount on a new vehicle. This incident could have proven fatal if happening at highway speeds since it stalls engine out and makes braking nearly impossible. Both GM and the NHSTA have really flunked on this one, should have been recalled during first complaints in 2020. I will continue to file complaints here on NHSTA and with GM until the cows come home.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11669754June 27, 2025
UNKNOWN OR OTHER
Sunshade is not rolling back and has come off the tracks obstructing rear view and I am unable to drive the vehicle
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11666004June 10, 2025
ENGINE
The contact owns a 2019 GMC Terrain. The contact stated while driving 25 MPH, there was an abnormal sound coming from the engine. The low power message was displayed. The contact pulled over to the left side of the road and waited for towing assistance. The contact attempted to restart the vehicle; however, the vehicle failed to respond as intended. An independent mechanic was contacted. The vehicle was towed to an independent where it was diagnosed that timing chain, timing gears, the vacuum pump, cam phasers, and sensors all needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure but offered no assistance. The contact was referred by the manufacturer and was informed to contact NHTSA to report the failure. The failure mileage was unknown.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11666099June 10, 2025
ELECTRICAL SYSTEM
Back up camera service notice.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11665797June 9, 2025
SERVICE BRAKES, HYDRAULIC
The contact's wife owns a 2019 GMC Terrain. The contact stated while driving 70 MPH and depressing the brake pedal, the brake pedal was firm, and the vehicle failed to respond as needed. The check engine warning light was illuminated. The contact stated that upon depressing the brake pedal with excessive force, the vehicle responded as needed. The contact stated upon inspecting underneath the brake booster, the contact noticed a lot of debris due to lack of vacuum pressure. The dealer and the manufacturer were notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 80,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11663215May 27, 2025
POWER TRAIN
The contact owns a 2019 GMC Terrain. The contact stated upon taking the vehicle to the Nissan dealer where it was purchased for an oil change, the dealer informed the contact that there was a crack in the transmission. The vehicle was then taken to a GMC dealer, where the contact was informed that the crack was more than two months old. The dealer determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 38,700.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661661May 18, 2025
SERVICE BRAKES
Vacuum pump broke and car has no brakes
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11660324May 12, 2025
SERVICE BRAKES
While driving the breaks completely locked up and the smell of exhaust entered through vents. Ran a code machine indicating that the break booster power vacuum pump was needing replaced. There are no other issues with my vehicle that would cause it to malfunction out of no where.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657930April 30, 2025
POWER TRAIN
The contact owns a 2019 GMC Terrain. The contact stated that occasionally while driving at various speeds, the vehicle independently shifted into neutral(N) and the vehicle lost motive power while the accelerator pedal was depressed. In addition, the vehicle had shifted from park(P) to drive(D) and into neutral(N). There was no warning light illuminated. The vehicle was taken to a local dealer, where it was diagnosed; however, the cause of the failure was not identified. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 45,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657064April 27, 2025
SERVICE BRAKES
Breaks went out on vehicle with no warning or lights on dash. Nothing prior or now indicating any issues with breaking system.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11652452April 3, 2025
UNKNOWN OR OTHER
While driving under normal conditions the panoramic sunroof shattered. This is a serious safety issue and obviously a problem with the manufacturing of the tempered glass
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11650822March 26, 2025
POWER TRAIN
While driving the car went into power save mode and completely shut down. There were no prior lights or warnings that the car was having issues. While driving at 45mph on a busy road it just suddenly shut down. It would not move to get it out of the road. I was almost hit from behind. After the car was towed, it was diagnosed as a broken vacuum pump and exhaust camshaft. Our Terrain only has 67,773 miles at the time of the incident which was unfortunately just outside of warranty. Since this incident and the repair, the car has had to go back to the shop 4 times. It is still not driving correctly and stalled as I pulled out onto a main road almost causing an accident. Still working on getting it diagnosed and repaired correctly. The mechanics I have spoken to indicated this engine/car is known for these issues. Without any warning lights or signs of issues prior it really put us in a dangerous situation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11648110March 13, 2025
ENGINE
Faulty vaccuum pump blew leading to engine failure. On the highway randomly, with my child in the vehicle. This almost caused a huge accident. I’ve kept up on all maintence and oil changes. This has been a huge effect on my life as I’m a single parent and randomly had to spend thousands on a new engine for zero fault of my own. I’ve read many many people having this issue. Something needs to be done and action needs to be taken!!!!!!!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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