I was coming to a stop with my vehicle and the brakes would not work. I carefully got my car home and to a shop. It was determined that the break booster pump broke which caused metal parts to go into the engine. Now my engine is blown! Bought my car brand new in 2018 and kept up with regular vehicle maintenance has 90k miles.

- Lima, NY, USA

The dealer has not been very familiar with the diesel option in this vehicle. Dealer has found nothing wrong with the engine in this regard. Now the car is out of warranty and will be very expensive to fix according to outside mechanics. The car is experiencing severe BLOW-BY When the oil filler cap is removed while the engine is running, the pressure coming out of the engine is very high. I understand this is a very bad thing to be happening. The car has an engine light on, and it will not go out.

- Corpus Christi, TX, USA

Camshaft failed during driving causing vehicle to become disabled in the roadway and almost hit many times. The camshaft is being repaired by ase certified mechanic at an independent service center. A reduced power notice cam on a few minutes prior to the failure.

- Winter Park, FL, USA

When driving the car at low speeds, or right after having been stopped for a few moments. Upon, acceleration, the car will sometimes go into a limp mode. On the DIC, will be displayed a warning about how the car will have the speed reduced after 175 miles and to check the emissions system. The speed has already been reduced at that point. Also displayed maybe a warning about how the power has been reduced. USUALLY, if I turn off the car and wait about a minute, I can restart the car and drive at a normal highway speed again. But not always. The warning on the DIC, will usually turn off if the car does return to normal speeds after about 5 - 10 miles. However, the check engine light may still stay on for several days. This problem can be a daily occurrence. I've had the car in the shop several times, and they have been unable to fix the problem. The car can be unpredictably unsafe, when speed is instantly reduced to 30 mph!

- Corpus Christi, TX, USA

I have a 2018 GMC TERRAIN which I bought brand new from General Motors. In May 2022, the vehicle started jerking/hoping and trying to stall when the speed gets to 55 miles per hour or higher. I have taken it to the dealership on three different occasions for repair and I still have this issue. General Motors engineers were involved in every step of the repairs. They just do not know what is going on with the car or fix it and they are too stubborn. The dealership told me today that they cannot do anything else to the car. They also said they had a code from the engine last week and General Motors said they do not know what that code means. They are forcing me to accept/drive the car in this unsafe condition. I have contacted them multiple times and they do not care.

- Toledo, OH, USA

Beaverton GMC did repair work on my vehicle. During the inspection they said they found the radiator leaking from a number of spots and it needed replaced. It has never leaked and did not need replaced. Why did they do it? I as for the parts but they tossed them and would not give them to me.

- Newberg, OR, USA

Catalytic converter failed when driving damaging the engine. Vehicle undrivable and waited for repair at shop for over 90 days. Engine warning light keeps coming on with error code P1186 that the GMC dealer can not fix.

- Newberg, OR, USA

My auto started leaking some kind of oil.not sure what kind but I can see accumulation on driveway concrete pad. Had motor oil & filter changed in case it was a O-ring or not tight enough. It continues to leak.

- Goliad, TX, USA

My 2018 GMC Terrain has major issues that almost caused me to hit a wall on the expressway due to a brake assist issue that other owners have a issue with and GMC has done nothing to help the buyers, where can we the buyers get help with issues GMC is well aware of??

- Park Forest, IL, USA

Recall on the engine block heater. The dealership is unable to get the part to replace. I took in over 6 months ago and still have nothing.

- Farmington, CT, USA

The new auto stop that shuts off the motor when you're at a red light doesn't work properly. Sometimes it shuts off, but most of the time it doesn't been to the dealer two times and the radio will not come on at times even though GM has performed updates on these problems. The problems still exist

- Warren, MI, USA

Was leaving a parking spot. Vehicle reversed fine, put it in drive and it began to jerk and did not accelerate properly. Made it to the next aisle to park it and get out of way. Once parked, shut off vehicle. Started it. Reversed it and it would only rev up, did not reverse. Put it in drive and it jerked forward, hard and kept jerking as I pulled forward. Parked it again and turned it off. Called dealership, who called a tow service to tow it to them. Attempted to show tow guy the issue at his request, upon his arrival, put it in reverse and it revved up briefly then jerked into reverse. Had to move vehicle to clear area to get it on the tow truck so I put it in drive and it began to jerk constantly and barely accelerating as I drove and felt and sounded like it was going to shut off (but didn't) before I made it to where I could park again. Luckily I was in a parking lot and not on the road. I've had this vehicle exactly a month. Very scary.

- Bells, TN, USA

While the vehicle is in drive it loses propulsion without notice. The vehicle stays in drive. The vehicles RPM increase as your foot is on the accelerator but the vehicle doesn't continue to move. The only way to regain propulsion is to completely shut the vehicle off and then start up again.

- Elizabeth, PA, USA

I got a diagnostic alert: Service the enging and transmission system in your 2018 Terrain within 7 days. The code was P050F. I have a little over 10,000 miles on here.

- Johns Island, SC, USA

My vehicle is stalling and stuttering while trying to accelerate. It also does the same when decelerating. The truck will jerk and stutter. Also making noise like a vacuum cleaner while this is going on. I just purchased this vehicle in September 2018 and it has been going on since November 2018

- Paterson, NJ, USA

The contact owns a 2018 GMC Terrain. The contact stated that the vehicle's electrical system failed. The vents located near the instrument panel emitted a strong burning odor when the heating system or air conditioning system was activated. In addition, the front end of the vehicle exhibited a strong vibration that caused the steering wheel to vibrate. Furthermore, when the rear hatch door was closed, the rear hatch door light remained illuminated. The contact stated that the rear driver's side hub clips separated. On star performed a diagnostic and provided the contact with diagnostic case number: 109309958. The vehicle was taken to rainbow northshore Buick GMC (2925 North highway 190, covington, la 70433, (888) 494-1484) for inspection. The dealer only cleared the on start connectivity codes and informed the contact that there was a defective module. The manufacturer did not have a remedy for the failure. The vehicle was not repaired. The manufacturer was contacted. The approximate failure mileage was 4,000.

- Mandeville, LA, USA

Driving on a downslope heading North on 65 going into Tennessee from Alabama I experienced a loss of power system lights went off along with gauges going off and on. At which time stabiatrak and transmission lights came on saying to pull over immediately.we did so called GM onstar where they told us we would experience a loss in power but could travel onward. We chose to get towed, however due to the holiday we had difficulties getting a tow and were forced to drive home 90 miles away. The problem did not present itself again on the drive home. We took it to a GMC dealer in vestavia hills they pulled off the codes but had no reason for the issue nor were they able to get service bulletins from GM on the issue. I documented the findings went home and a later on 11/23/18 the problem occurred at about 130 miles from the first incident. This time it happened going up a hill and giving the car gas did nothing to get me up the very small grade. I had to put it in reverse and get a running start at the hill in order to make it home. I called GM again and requested a tow to a second dealer in trussville, al they were unable to even see it until Monday 11/26/18. I am very fearful that if we have to drive it again that I may not be as lucky.

- Birmingham, AL, USA

The auto stop feature is a safety hazard. On several occasions when foot is taken off brake it is slow to merge into traffic, and being in South Louisiana even with ac on hi it still shuts down at times.

- Carriere, MS, USA

First issue with the vehicle was a separation of the dash near and around the passenger side airbag. Unknown at this time if the airbag has been compromised. I won't know until the vehicle would be involved in an accident. The second issue involves the vehicle while in park. I am able to push the vehicle and it will actually move forward. There is also a very hard shift while the vehicle is in motion. This occurs usually between 2K and 3 K rpms. The vehicle will actually jerk as it is trying to shift.

- Papillion, NE, USA

Purchased a brand new GMC Terrain. 12 days and 460 miles later the service engine soon light came on. Took it to dealership for a P050F. This is code for a leak in the booster. They did not repair anything, just checked for leak and reset engine light. As I read more, the problem affects the brakes ability to function properly increasing danger to driver. There is also defective stop/idle on the engine that no longer works. I was just driving down the road in town when it popped on. GM and young's have refused to refund this defective vehicle.

- Corunna, MI, USA