2018 GMC TERRAIN Complaints

11/24/2021 buy 2018 GMC Terrain, before leaving the dealership I told the seller that the engine light was on he said it was because they removed the alarm which I didn’t want to buy and the light was going to be off later and told me to take the car to service on Monday 11/29 so my husband took the car they repair a detail on the handle door and he said the engine light it’s off so we tough what he said about the alarma, we trust the seller but on 12/26/2021 I left California to Texas, I was about 4 and a half hours away the car began to lose speed and a very strange noise was heard, I stepped on the accelerator and did not raise speed, I had to step aside the freeway and the car turn on but It did not go forward or backward and NO warning light was on dashboard, nothin ! The car broke down in Arizona in the middle of nowhere, it’s was freezing and almost got hit by a semi truck, it was a very frustrated experience.

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.

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.

Auto-Stop feature does not have a button to disable the feature.2019 model has the disable feature and GM needs to provide a means to disable it, even if on a temporary basis.

Multiple warning lights are appearing at once (Automatic brake assist, forward collision assist, parking brake released) When the car is put in reverse, the radio turns off for a brief moment and the steering assist warning shows on the dash. The steering wheel snatches back in the opposite direction causing a safety concern. The car also completely cuts off after the auto-stop takes effect at red lights causing me to have to pump the brakes at least twice to re-ignite and be able to accelerate.

Car gives a "Power Steering Reduced, Drive With Care" message after turning the wheel one direction and braking simultaneously. After message is displayed, power steering is no longer available, and this can happen while driving around a curve. Once car is powered off for longer than 1 minute, can turn back on with no problem, but problem can come back just the same. Took to GMC dealer. They recalibrated my car, but problem came back 1 month later. They said they can replace the whole electric steering system, but that may not fix the problem, as they do not know what the real problem is. Vehicle was purchased used with 50K miles.

The vehicle experienced a sudden loss of braking and displayed a “brake assist “ fault message. The check engine light has illuminated. The sudden loss of braking was in a residential neighborhood traveling at 35 mph. I was turning during the loss of braking and was able to narrowly avoid collision with the cars at the intersection because I could not slow to a safe speed. The fault codes have not been read by the dealership yet nor has the repair been completed.

Yesterday morning I noticed a smell of gas around my car. I looked and didn’t see anything. I drove to work. Once I got back to my vehicle after work I could smell gas as I approached my vehicle. I looked under my car and noticed a puddle of gas. I went to the gas station to put enough fuel for me to make it home in my vehicle and as I was putting the gas I noticed a drip under the vehicle. Once I got home and parked my vehicle I looked under the car and there was a rapid and steady drip coming from the fuel tank. The same make, mode and year of my vehicle has been recalled for this.

The turbine shaft in the transmission broke without warning. The part could have failed in an intersection leaving the vehicle in the middle of the road and potentially causing an accident as the vehicle was unable to move under its own power. Luckily it failed going down the interstate and my wife was able to safely coast to the shoulder. Yes, the vehicle was disassembled by the dealer and the broken part discovered. There was no warning that this would happen. The ironic part was that the vehicle was in to the dealer the day before for a emissions recall, a check engine light (emissions related) and a routine maintenance front end alignment and left my wife stranded the next day.

The "Service Brake Assist" issue in other 2018 GMC SUVs is happening in the 2018 GMC Terrain, but it is not part of the recall. Our brakes became EXTREMELY difficult to press right as we were turning onto the on ramp of an expressway. Thankfully we were smart enough to pull over and not get on the highway. Had we done so, I may not have been here to type this complaint. The brakes be come extremely difficult to press and that message shows. Dealership is going to charge me $400 to replace a vacuum pump - they were not interested in the information I have around this issue in other GMC SUVs since it isn't a formal recall on the Terrain. I could have died yesterday due to this braking issue. I've owned this car for 3 months.