2018 Gmc TERRAIN - Ratings, Complaints and Recalls

"my vehicle keeps showing “service brake assist” and “service tsc” lights. i was on a hill and the auto-start was engaged, as well as hill assist. when i let off the brake pedal slightly to get the car to come out of auto-start, the car acted like it completely shut off (radio went black and lost power) and the car just started rolling backwards quickly. if there was a vehicle behind me it would’ve %100 caused an accident. my wife and child ride in this car every day and this is the second time i’ve had serious issues with this car. the first time i was driving down the interstate and the brake vaccuum pump went out and i lost all brakes, i had to put all 180lbs of my weight on the brake pedal to get it to stop."

"vehicle brakes went completely hard and vehicle would not stop. there was no warning signs, no lights on the dash and vehicle was driving on highway normally. upon taking a highway exit, i could not stop the vehicle, completely unexpectedly. upon further research it is a very common problem that needs to be addressed. my 3 kids and wife were in the vehicle when it happened, and this is actually the second time it has happened. the first time it happened we could not stop the vehicle at all to turn onto the road i live on, could barely push the brake pedal and coast to a stop. the repair last time it happened was the camshaft driven brake booster vacuum pump, and it has failed again after 20,000 miles. this is a serious manufacturer defect that has almost killed my family twice now."

"while driving down the road at approximately 55 mph, came up to an intersection, 4 lane i was in the right lane to go straight, there was a right turn lane next to me. i applied the brakes, pedal was really stiff and very slow to respond, i was able to edge over into the turn lane cutting people off and just barely missing the vehicles in front of me. it took 5 car lengths to stop my vehicle. when i finally was able to get the vehicle fully stopped i was almost in the paths of the crossing traffic.. when the light turned green i was able to slowly cross the intersection looking for a safe place to pull over. immediately crossing the intersection the service brake assist notification appeared, about another half mile the vehicle informed me of loss of power and that it was reducing engine power (limp mode). i was able to find a gas station parking lot to put it. when i opened the hood i noticed quite a bit of engine oil located under where the brake assist pump was located. i had lost about 1.5 quarts of oil. i refilled that. the next day i returned with a tow dolly. the vehicle was started just long enough to load and unload it at home. we pulled the vacuum pump where upon inspection it was noticed that the part has exploded and so far we are still missing some pieces that may be inside the engine. this is a known and documented problem of this part and should have a safety recall issued. . i still owe over twenty eight thousand on this vehicle and it has only 109,000 miles on it. i hope we can find all the pieces and that the engine wasn't fately harmed. gmc needs to make this right, a lot of people could have been harmed."

"driving on highway and all of a sudden i could not break - the car breaks failed to operate - had to slowdown by it self and pull to a mcdonalds, i had the loss of effective braking with no warning whatsoever. we found out that the break booster pump was destroyed without any warning from the electronics of the suv."

"the contact owns a 2018 gmc terrain. the contact stated while driving 45 mph, the check engine warning light illuminated. the contact stated while making a left turn the brake pedal was depressed but failed to stop the vehicle. the contact was able to continue driving without proper braking response to her residence. the contact stated she used the parking brake to fully stop the vehicle. the contact's husband took the vehicle to the local dealer, where it was diagnosed with needing an unknown pipe and vacuum pump to be replaced. the vehicle was not repaired. the manufacturer had not been informed of the failure. the failure mileage was approximately 79,000."

"brakes go to floor an brake peddle starts to vibrate, (lost of brakes ) brake assist light comes on. vehicle has 27000 miles . problem started at 6000 miles an was brought to gmc service centers 3 times for same issue. they replaced 3 different parts at a total cost of1600 dollars. brake system is being replaced one part at a time at my expense, gmc has no clue what problem is. will not admit there is an issue? just got vehicle back for 3rd time an 3rd new part ."

"when trying to brake, brake pedal became extremely hard to push and repair brake assist notification and check engine light came on"

"vacuum pump went out brakes hard to push and i know gmc had a recall for this issue on other vehicles as well previously."

"brake has to be pushed all the way down hard to stop, brake assist warning comes up. i’ve had the car for less than 2 years and it’s way too new for anything to go out. undriveable unless it’s fixed."

"while getting off the interstate, the brakes failed with no prior warning, or issues. the brake pedal became extremely difficult to depress and stopping distance was greatly increased. could not come to a complete stop without using the emergency brake. we drove home (about 2 miles from the interstate exit) and about a half mile after the brake failure, a "service brake assist" light illuminated. vehicle was towed to dealership the next morning. the problem was the vacuum pump exploded and caused vacuum to the brake booster to be lost, making the pedal difficult to push. luckily this happened at 11pm and there was nobody in front of us, there definitely would have been a collision."