Dash had gone black intermittently, did not know what speed I was going. OnStar called oor phone multiple to notify us that our airbags we're offline for ten days no warning light on dash until one to two days later. Took to service was informed that gear shift control, engine control module, passenger presence module and airbag sensor needed replaced. All within a month of purchase of said USED vehicle. Vixed under warranty. Then another monther later, got warning on dash saying "conditions not current for shifting", park break light came on, and a p in a yellow circle with a wrench under it came on. Serive did fix vehicle, but could not verify message on dash about conditions not favorable... Also recalibrated breaker. Complained numerous times to dealer about these issues and was told "live with it".

- Niles , OH, USA

As I was driving on the highway in New York on Route 17 south near exit 111, I tried to accelerate but when I did the car went slower and the check engine light and traction control lights came on. I was right in front of a huge truck and thank God I was in the right lane that I was able to quickly get on the shoulder and turn the car off. I was able to make it to where I was going, but it was very nerve wracking. I took the car to the dealer service center and was told that it was probably a fuse issue. It turns out my entire engine has to be rebuilt. I have approximately 25,000 on my car, how could it require an entire engine rebuild? The dealer has gotten me two rentals cars that only last 5 days at a time each time and now I-€™m driving a dealer loaner. It-€™s been 3 weeks and still nothing. I-€™m still making payments on my car.

- Deposit , NY, USA

Not long after I bought my 2020 GMC Terrain my adaptive cruise started disengaging. There are never any warning lights, except the noise and vibration of the seat before it shuts off then tells you it's disengaging. I didn't think anything of it until it's became a regular occurrence in the last month or two. I tell my dealership about it and they drive it but it never disengages on them, so they say nothing is wrong with my vehicle. I have a picture of the "adaptive cruise disengaging" and video of where I can't reset it until after about 15 or so minutes or letting my car set for a while or turning off the engine then it works again. I also have noticed that my auto start/stop hasn't been turning on & off anymore.

- Odessa, TX, USA

Purchased new 2020 GMC Terrain w/7miles. Left dealership on my way home, and within 20 miles, received a message on dash-> service - ESC - dismiss. Check engine light flashed several times, and the SUV slowed down at least 10 miles from 65miles per hour. After engine light stopped blinking, I continues home around 30 miles more with no more problems. Called my sales person the next day, and he did not know what ESC was. (electronic stability control) he called me back and indicted the vehicle may need a software update. I told my wife, why would a dealership not check on vehicle software updates before releasing vehicles to the new owners, prior to leaving the dealership. This is called, "being proactive." We were on the highway leaving the dealership after purchasing this new SUV.

- Long Pond, PA, USA

Every week it's something different. In motion... no Cruze control. No audio. Don't drive over 50mph brake problem. Parking brake engages randomly and without user engagement. No AWD. No stability traction. This happens so frequently the dash indicators have been reduced to 'idiot lights'. at what point do I become concerned" things appear to resolve when the engine is turned off and back on, sometimes....I compare it to other glitchy technology. However I potentially could be at an 80mph crazing speed when I decide to ignore the idiot lights...what happens when a real problem presents and I ignore the dash indicators do to frequent glitches" I'm so disappointed. My 2 previous Terrains were 10 times the vehicle the 2020 model year.

- Rochester, MN, USA

When cruise control is engaged at 71mph, holding +res button to increase speed and releasing it at 77mph sets cruise speed too high. Car continues to accelerate. Cruise gets set at 100mph and accelerates more then desired. See link with video of event https://photos.app.goo.gl/O7zgeqwcsu7kycv58 see attached picture of owners manual

- Evanston, IL, USA