My service brake assist light came on and then within seconds my vehicle then said engine power has been lowered and my vehicle pretty much shut down no steering no brakes couldn't do anything. Took it into the repair shop and my vacuum pump has shattered and now damaged my camshaft. I am aware there's been many other vehicles recalled with GM's vacuum pumps and I'm not sure why my year and model has not been included when it's doing the same thing and not to mention I have seen countless other cases of people saying same things happen to them with their GMC terrains.

- Slidell, LA, USA

Unknown...acts as if its a smart car that's not really a smart car

- Cottage Grove, OR, USA

Brakes hard to press. Almost cause an accident on interstate. Was able to contain vehicle. Took to autozone to assessed and it said Powertrain System. Brake Booster Senor Circuit.

- Houma, LA, USA

The contact owns a 2020 GMC Terrain. The contact stated while driving at various speeds, the vehicle lost brake functionality while depressing the brake pedal. The contact stated no warning light was illuminated. The vehicle was towed to a local dealer where it was diagnosed with needing the vacuum pump replaced. The vehicle was repaired however, the failure persisted. The manufacturer was not informed of the failure. The failure mileage was approximately 40,000. The VIN was unavailable.

- Kenilworth, NJ, USA

Service brake assist message came across screen after I was unable to push down brake pedal.

- Beloit, WI, USA

When reversing out of a parking spot, brakes failed causing accident. Multiple attempts to depress brake pedal with no braking. Hit a parked car. After shutting car off and attempting to move vehicle brakes did engage and respond correctly. Rear damage to Terrain occurred requiring towing.

- Aurora, CO, 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