GMC Terrain Complaints

3,167 consumer complaints on file.

#11681275August 18, 2025
FUEL/PROPULSION SYSTEM
FUEL PUMP WENT OUT AT 42K MILES.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11681255August 18, 2025
AIR BAGS
I was driving down a paved road and my side airbags deployed. The gm investigation showed my car left the road way, however I am uncertain of that. There was no crash or impact or damage to the vehicle from this incident other than the airbags deploying. There is a scrape on the passenger side due to an incident in April. That is not related to this incident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11681027August 16, 2025
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, FORWARD COLLISION AVOIDANCE: WARNINGS
My wife and I took our new vehicle on a 7k mile road trip this summer. Two times while on the freeway around 70 MPH, the sensors went wild. The cars auto break came on and red lights and collision warnings went off in the seat and the HUD. The vehicle slowed down to about 35 immediately! Then everything turned off and we sped back went down the road like nothing happened. Luckily there was no behind us or in front of us for a good distance. The thing is during both of the there was a car in the lane next to us at our 1 or 2 o'clock position. Perhaps the sensors. Mistakingly thought we were about to hit that car. Can these seniors be adjusted?
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
#11680841August 15, 2025
SERVICE BRAKES
I was driving on the expressway, attempted to brake and the brakes were stiff and would not go down to stop the vehicle. . Thankfully, I was able to glide over three lanes of traffic and exit the expressway and glide into a parking lot and drove around until the car came to a stop. No lights. No warning. The car had to be towed to my mechanic. This could have been catastrophic. I could have killed someone else or myself. This is the second time that this has happened with this vehicle!!! By the grace of God I am still here writing this complaint. I am traumatized and do not feel safe driving this car. They MUST RECALL this vehicle before somebody gets killed. The issue is with the vacuum pump and I have seen other complaints about the same issue.
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
#11680943August 15, 2025
FUEL/PROPULSION SYSTEM
While driving the fuel pump failed and started spraying gas everywhere in the engine compartment.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11680854August 15, 2025
POWER TRAIN
I purchased a new 2024 GMC Terrain in March 2024. At the time of the incident the mileage was approximately 18,000 miles. On [XXX], as I was driving on a MA state highway, the car lost power with no warning. I was able to "coast" into a parking lot where I contacted OnStar; a flatbed tow truck was dispatched and the car was towed to the local dealership where it was purchased. At this time, the car is still at the dealer as I was informed by dealer service consultant that it's a "massive" transmission job and parts were on back order from GMC for over three weeks. I specifically purchased this vehicle to be safe on my monthly trips to NY to visit grandchild. I no longer feel safe in this vehicle and have no guarantee this won't happen again. The fact that the transmission failed in 1 yr. old car at 18,000 miles is of great concern to me. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11680641August 14, 2025
SERVICE BRAKES, ENGINE
GMC techs have already documented this issue could not be caused by wear and tear or lack of service - of which there is none the car has been serviced every10k miles as advised. GMC coperate has been contacted case # 71853883 The vacuum pump has failed due to MECHANICAL FAILURE causing it to explode and send pieces into the camshaft. The lack of vacuum caused complete brake failure rendering the car unsafe. GMC is aware of the issue as others habe reported it (I have proof of this) and refuses to recall the cars. The cars loose breaking in the middle of driving with no indicator lights or any other indications. The breaks had just been replaced in may - the incident occurred in October. Has not been driven since.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11680356August 13, 2025
ENGINE
The contact owns a 2022 GMC Terrain. The contact stated that upon approaching an intersection with a red light, the contact depressed the brake pedal, and the vehicle lost automotive power. The vehicle came to a stop at the light. The contact attempted to restart the vehicle; however, the vehicle failed to restart. The vehicle was towed to an independent mechanic to be inspected, and the contact was advised that the vehicle needed to be diagnosed by an authorized GMC Dealer. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The contact was advised that the VIN was not under recall. The manufacturer was notified of the failure. The approximate failure mileage was 21,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11680256August 12, 2025
SERVICE BRAKES
I was driving on the highway & my brakes failed. My brake pedal was completely hard & could not be used. i had to steer onto an exit ramp & be towed to the dealership. There was absolutely no warning of this happening. Once at the dealership, they confirmed it was my vacuum pump that blew up, which damaged the camshaft & caused pieces of metal to be floating around in my engine. The greater portion of the repair was covered under warranty, however, I had to pay $350 out of pocket. This could have been catastrophic. I or others on the road could have been injure for worse. This system failure should be fixed immediately and owners be compensated. I do not feel safe driving myself or my family in this vehicle after experiencing this occurrence.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11679365August 8, 2025
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
a little over two weeks ago we were going to sidney to get groceries. it was hot that day so we turned the a/c on. fog started coming out of the vents, it looked like we turned on a fog machine! a few days later we were going to town, my daughter got in and the whole driver's side floor was full of water. there was so much of it we had to get the shop vac out to suck it up. I called the dealer where we purchased it from because it still under warranty. their shop guy was out for the week so they scheduled me an appt for the following week. by this time my speakers aren't working, my signal lights dont make any sounds when I use them and the floor is soaked again. on August 5th we took the car into high plains and left it. they said they worked on it for 4 hours and fixed the problem, some drain line was plugged with sludge and so the water knocked out a module or amp. I thot everything would be covered but then they said I'd have to pay because all of a sudden a mouse had causes that line to get plugged. I asked them for pictures because im turning it into my insurance company, and they said they would send them. they never have I requested the pictures 2x, once with Patrick the shop manager and then with Jeff presser, owner. Still today, nothing. Meanwhile yesterday here comes all the water on the floor again. We use this vehicle to haul my grandson to his therapies and medical appointments. he [XXX]. Now were worried that mold has started growing because even though were sucking up the water, the floor pad and carpet are still wet. I went online and have seen numerous people complaining about the same issue for years with these GMC Terrains, why hasnt there been a recall or national warning on this faulty problem? INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678945August 7, 2025
POWER TRAIN
I bought this car used and had only had it about a month when I was driving to work and was in slow traffic on the freeway when my car slowed to a stop despite the fact that I had my foot on the gas pedal. It turns out it was a transmission failure. My safety and the safety of the drivers around me were put at risk because I was unable to move my car over to the shoulder and out of the lane of traffic. Traffic was slow but was still moving. My vehicle is available for inspection but I’ve already had it repaired so I no longer have the faulty transmission. The problem was confirmed by an independent service center where I had it repaired. The vehicle was inspected by the dealer and the independent service center. The dealer had it for 12 days but was unable to diagnose it so I took it to an independent service center. It was also briefly looked at and listened to by the highway patrol officer who assisted me and he also thought that the transmission had failed. The check engine light was on when this incident occurred but I was having an issue with one of the glow plugs and I thought that that was the reason. The check engine light came on the night before the transmission failed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678887August 6, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2013 GMC Terrain. The contact stated that while driving 30 MPH, the vehicle hesitated with the check engine warning light illuminated. The contact also stated that while coming to a stop, the vehicle lost automotive power. The vehicle was able to be restarted. The vehicle was taken to an independent mechanic, where it was diagnosed that the engine had failed due to the engine consuming oil. The mechanic informed the contact that the engine could be repaired and suggested that the engine needed to be replaced. The dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 88,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678896August 6, 2025
SERVICE BRAKES
Master cylinder , less then 1000 miles was pulling out of a parking lot and the brakes went out
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678671August 6, 2025
UNKNOWN OR OTHER
Vehicle shimmies upon acceleration from a stopped position.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678282August 4, 2025
ENGINE
I own a 2015 GMC Terrain, 4D. Vehicle started displaying error P0016 during the evening of 07/27/2025, the following day the vehicle stopped working. I towed the vehicle to three different mechanics. All three mechanics indicated that the engine needs to be replaced. Two of the mechanics indicated that this was a common issue with this GMC SUV and I wanted to reported. P0016 states, "crankshaft position camshaft position correlation Bank 1". I am disappointed that this issue has not been reported or recall. There are multiple youtube videos and online chats regarding this issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678054August 3, 2025
UNKNOWN OR OTHER
Constantly have water leaking into spare tire compartment, back seat floors and passenger floor. Mold/mildew smell coming through vents. Have had drains lines cleaned out, and still recurring having this issue. Unknown where leak is coming from. This is a serious health risk.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678014August 2, 2025
FUEL/PROPULSION SYSTEM
car quit while driving could not control stopped across 2 lanes of highway almost was hit by big truck. Car would not start or go into neutral. When car almost started i put it into neutral and was pushed off of highway. dealer towed car and replaced fuel module at 25423 miles.
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

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