1. while driving, the collision alert will randomly go off and decelerate the vehicle, even if there are no other vehicles around. This has been happening periodically for the last couple years, but is getting worse and more frequent. It feels like it shifts to neutral and engages the brakes. This has almost caused us to be hit by cars behind us on the interstate. 2. for the last few years there is absolutely no way to tell the milage on the car is. That sensor went out and the GMC mechanic that I had fixing a different issue with the car stalling randomly (which I now discover is a very common occurrence with this vehicle, but not covered by warranty as it happens a few thousand miles after full warranty expires-this was 2017) that this is a common issue with Terrains and was not covered under warranty (shocker). And I'm not willing to but the hundreds of dollars necessary to fix the problem.

- Rogers, AR, USA

Stabilitrak warning and check engine light came on. Gauges went to 0 and then bounced up and down while I was driving. The car refused to accelerate over 40mph. This time I was not on the highway, but this has happened while driving on an interstate as well. I have put in a complaint with General Motors and they called back once because I thought the car got bad data when my cc for onstar was compromised. They have not returned my calls since. I have taken it to a certified GM shop 4 times and they still cannot diagnose the issue. I am terrified to drive the vehicle now. This last time, I was able to record the gauges acting crazy and have also sent that to General Motors.

- Gray Court, SC, USA

I bought this vehicle in Nov. 2018. Two months later I started having problems with the stabili trak. I have had it in the shop at the GMC dealer twice. All codes passed because the stabili trak light turns off. Both RPM and speedometer needles go up and down real fast. Sometimes they stay at 0 and I start loosing power. If I'm stopped, it takes forever for it to gain any speed. I turn it off and restart it only for it to start all over again. I turned it off once and tried to reset and completely dead. Third time it started. Dash lights go from dim to bright and back. The dealer said they cant find the codes if the stabili track light isn't on, yet the check engine light stays on. It is getting worse, almost every day. But the stabili trak light doesn't stay on long enough

- Davenport, IA, USA

Started March of 2017 progressively getting worse. SUV jerks, gauges go crazy, check engine light comes on, if slow to below 20 mph it sputters and won't accelerate, if I stop completely it won't accelerate. Multiple times this has happened on the interstate during rush hour traffic & at busy intersections. If I turn car off and back on the system resets. Then it starts all over again. It has been in and out of the shop. Probably 10-15 times in 2years. They get codes, but then these go away before they can be 'run'. I broke down 1-1/2 weeks ago in bay minette & the car wouldnt start back up. I was stranded out of town and had to rent a car to get back home. The dealer there got 7 error codes that all cleared out. I have filed a compjaint with GMC, but they are slow to handle the problem & I can't get supervisors on the phone or at least one who doesn't seem like he's been drinking.

- Warrior, AL, USA

I purchased my vehicle from a dealer in June 2018, and about a month of purchasing it my vehicle has been hesitating in acceleration, at first I didn't think anything of it, but it started getting worse. Two days ago when I was driving my vehicle in the downtown area (city streets), it was bucking a lot. When I got to my destination and restarted the vehicle, I put it in reverse and proceeded to drive back but the car shuddered and then shut off completely and the malfunction indicator lamp light came on (but it didn't stay on long). Today as I was driving it continued to jerk, especially when I was driving around 20 mph or below (which I had to do because of the school zones). My vehicle shut off again as I began to pull off from dropping my child off at school, which almost caused another parent to crash in the back of me. The only way I could keep the car from shutting off again is by accelerating on the gas above 20 mph.

- Elgin, SC, USA

Third time while driving on city streets the car begins to shake and stall. I pull over or stay in place as the car proceeds to turn off. The service stability traction and engine lights light up and the car dies. Each time I am able to turn the car back on within a few minutes.

- Indio, CA, USA

Engine reduces power, stabilitrak light comes on and vehicle shuts off. All three times it happens usually during or after highway driving. Car has been in service 3 times for the same issue. 8/3/16, 8/11/16 and 1/4/17.

- Plainfield, IL, USA

Engine keeps shutting off while driving; would have to guide the car off the road and restart. Radio shuts off; all electrical systems shut off and car would have to be restarted. This has been happening after the car was purchased sporadically since last year. The vehicle was turned in for service on the issue, however I was informed that they found nothing wrong. Just this past week till now, the cars engine and electrical system starting shutting down again while driving or while in parking mode at least more than 6 times.

- Hagatna, GU, USA