GMC Terrain collision warning problems

Filed Sep 23, 2026 · Driver assistance · TX

On the evening ofXXX, at approximately 6:00 PM, I was driving this Avis rental vehicle on a highway in [XXX] at normal highway speed, below the posted limit, with my foot on the accelerator. The forward collision warning and automatic emergency braking system activated and applied the brakes hard. There was no vehicle, pedestrian, obstacle, or hazard ahead of me, and no vehicle behind me or beside me. The roadway was clear and dry. The sun was low in the sky, and the vehicle was crossing a metal expansion joint on an overpass at the moment of activation. I believe the low sun angle, the expansion joint, or both caused a false object detection by the forward-facing camera or radar. The service brakes themselves functioned correctly. The failure is in the forward sensing and decision logic, which commanded a braking event with no object present. The deceleration was severe and unexpected. I sustained sharp pain in my neck and shoulder. Had any vehicle been following me, this would have caused a rear-end collision at highway speed. There were no warning lamps, messages, or other symptoms before the event, and none afterward. I had driven the vehicle for seven days with no prior indication of a fault. I exited the highway immediately and drove back to the rental location on local streets at low speed because I no longer trusted the vehicle. I returned it the following morning when the Avis office opened, more than a day early, and reported the defect. Being a rental vehicle it was not available to me for inspection. The rental company has advised that it was taken out of fleet for inspection after my return, that there are no open recalls on it, and that it will not release internal service records to me. I do not know the outcome of that inspection. To my knowledge the fault has not been reproduced or confirmed by a dealer, independent service center, or manufacturer representative. No police report was filed because no collision occurred. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S

Filed Aug 16, 2025 · Driver assistance · UT

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?

Filed Apr 21, 2025 · Driver assistance, Electrical · 22,000 miles · PA

The contact owns a 2022 GMC Terrain. The contact stated that while operating the vehicle, the service message was displayed, and the audible turn signal became inoperable, along with the collision warning and the On-Star feature. The cause of the failure was not yet determined. The dealer was notified of the failure, but no assistance was offered. The manufacturer was not yet contacted. The failure mileage was 22,000. The VIN was not available.

Filed Aug 6, 2024 · Driver assistance, Visibility · VA

The headliner fabric detached somehow from the panoramic track causing the fabric to hang down obstructing the rear and back window view causing a safety hazard. The automatic forward collision alert will come on for no reason since this has happened. The problem has not been reported to insurance or the manufacturer yet but GM is my next call. This is a safety hazard due to the obstruction of visibility to safely make turns or change lanes. This happened August 5th while driving with the windows up. It just dropped down still attached to the front of the track and the rear.

Filed Feb 20, 2024 · Brakes, Driver assistance · NC

Brakes got hard all of a sudden locked up, almost hit another car, front collision warning keeps going off and automatically hitting brakes with no one in front of me. I’ve read it could vacuum brake pump failure. Please recall this as many people have kids and could hurt them.

Filed Aug 25, 2020 · Driver assistance, Electrical · AR

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.

Filed Aug 4, 2020 · Electrical · 93,000 miles · AR

While driving on a rural road the 'collision warning system' activated with no vehicles in sight either in front of me or in the opposing lane. It happened again approximately 3 miles later. I turned the system off. This has the potential of a disastrous out come if I would have been in heavy traffic.

Filed Apr 24, 2020 · Brakes, Driver assistance · 66,000 miles · NV

Driving between 40-45mgh and stabilitrak failure service and ABS failure light comes on. At every bump the service lights goes on and off. Then on a smooth service the stabilitrak lights comes on until I get home. With the collision warning turned on the car also and almost frequently tends to brake on its own while driving. But here's the real problem this 2014 gmc terrain denali car is not on the 'recall' list - why? Seems it's from the same car manufacturer with same issues, shouldn't it be on the same recall list.

Filed Sep 25, 2019 · Brakes, Seats · 250 miles · WI

1) brakes have always rubbed & grabbed really hard when applied. Almost like they are defective rotors. Hard to stop fast. I notice they recalled a lot of their brakes, but not mine. 2). Transmission jerks & shifts very violently @ 16 & 17 miles per hour. Seems to slip & not shift @ that speed really rough. Has always done this. 3) sometimes the collision alert goes off & there is nothing around I live in the country & have no traffic it will just go off scares the crap out of you & startles me. I saw another person had this happen also all situations are in motion while driving. Biggest concerns are the transmission & brakes. 4) okay seats are supposed to be leather however, they went cheapy on the sides. It cracked & continues to crack & tear because the sides are vinyl. This started to happen @ approximately 3,000 miles. I only have 32,000 miles on it. I don't drive much.

Filed Aug 19, 2019 · Brakes, Electrical · 97,000 miles · OH

My car makes a rubbing noise when and only when you stop. Also my forward collision alert comes on when nothing is in front of me. Sometimes it won't even come on when a car is in front of me.