2026 GMC Terrain

The contact owns a 2026 GMC Terrain. The contact stated that while driving 10 MPH and pulling into a parking lot, the vehicle was shifted into drive(D) and the driver’s door lock unexpectedly unlocked. The contact stated that on another occasion, a passenger in the front passenger’s seat noticed the same failure with the passenger’s side door lock. The vehicle was taken to the dealer, where it was not diagnosed or repaired. The contact expressed concern that the failure was hazardous and posed a safety risk because the doors could open while the vehicle was moving. The manufacturer was not made aware of the failure. The failure mileage was approximately 2,500.

I recently pulled over to help a woman driving a 2026 GMC Terrain who had run out of gas in the middle of XXX in Virginia. Obviously, the first priority was to get the vehicle out of the travel lanes and onto the shoulder. I tried to figure out how to put the Terrain into neutral so we could move it, only to discover that **the vehicle cannot be shifted into neutral if it is not running.** Since it was out of gas, it could not start, meaning we could not put it in neutral and could not move it out of the roadway. Fortunately, a VDOT Safety Service Patrol truck came by. The driver stopped to help and thankfully had gasoline. However, I was told that, according to policy, he could not put gas in the vehicle while it was still in the travel lanes. This created an extremely dangerous catch-22: **the vehicle could not be moved because it could not start, it could not start because it was out of gas, and gas could not be added because it had not been moved out of the roadway.** I believe this is a serious safety issue with the vehicle. A disabled vehicle should have a reliable way to be placed in neutral regardless of whether the engine can start. This is especially important after a breakdown or crash, when the vehicle may need to be moved quickly to protect the occupants, other drivers, or first responders. If there is a manual emergency procedure for putting a completely disabled Terrain into neutral, it should be clearly documented and readily accessible to drivers and roadside assistance personnel. If there is no practical method, I believe GMC needs to address this design. A modern vehicle should not become an immovable roadblock simply because it ran out of fuel. Please investigate this issue and take whatever action is necessary to ensure disabled vehicles can be safely moved out of active traffic lanes.

Subject: Urgent: Unresolved Ongoing Vehicle Issues - Request for Contact ​To Whom It May Concern, ​I am writing to express my strong frustration regarding ongoing and unresolved issues with my vehicle. Ever since I purchased it, I have been plagued by constant alerts regarding various vehicle failures. ​My vehicle has already been reset and updated twice to address these issues. I just picked it up after it was supposedly fixed at the dealership this past Thursday. However, today, Sunday, [XXX], the exact same warning alerts have started popping up once again. ​This situation is unacceptable, and I need someone to reach out to us immediately to discuss a permanent resolution. Please contact us at either of the following numbers: ​Primary Phone: [XXX] ​Secondary Phone: [XXX] ​I expect a prompt reply to arrange the next steps. ​ INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2026 GMC Terrain. The contact stated that after a software update was performed, while driving at an undisclosed speed, the message "Departure Lane Limited due to the Trailer" was displayed. The failure affected the blind spot warning system. The warning light failed to display while approaching a vehicle on the blindside and erroneously operated while there were no vehicles on the side of the vehicle. Additionally, the "Rear Cross Traffic Warning" light was affected by the failure. The vehicle experienced hard braking while there was no other vehicle nearby. The dealer was contacted and diagnosed the vehicle with sensor failure caused by an impact to the sensor. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 11,350.

This vehicle was bought new and is a NEW 2026 GMC TERRAIN DENALI with less than 5,000 miles at this time. It is a continuous event and not a specific failure date, but began soon after purchasing. The specific parts are UNKNOWN. It could be tires, wheels, steering parts (CV JOINTS, CONTROL ARMS ETC) or possibly transmission. I took it initially to the purchasing dealership and they took it for a ride and just dismissed the problem without investigating. Several days later I called and talked to the person who sold me the SUV and was told either him or service manager or both would call me, but neither did so. They were to set up a return date. After this insulting experience I decided to take it to a Cadillac dealer that I have had great experience with in the past. They took it for a ride and did experience the problem and investigated what they thought could be causing the SUV to wobble, shimmy, or shaking sensation. This Cadillac dealer said there investigation showed nothing wrong and returned the vehicle to me and said nothing could be done unless GM gave them permission. Next I wrote to the service manager expressing my disappointment in nothing being done and my disappointment in General Motors. There is a Service Bulletin (Document ID: PIT6466). This makes four efforts on my part to get satisfaction with this 2026 GMC TERRAIN DENALI and how it is not fun to drive and there is anxiety on the safety of the vehicle when being driven. *Now for the problem I am experiencing with this 2026 GMC TERRAIN DENALI. There is the sensation of a “wobble, shimmy, or shaking” under low to moderate acceleration when going straight or turning. It could be tires, wheels, steering parts or power train. It is difficult to tell. Sometimes the sensation is as if the wheels will fall off. This is an awful feeling and gives you the feeling the SUV is not safe and it is not fun to drive at all.* Why do I have to drive a brand new expensive SUV and feel unsafe and not enjoy do so?

The contact owned a 2026 GMC Terrain. The contact stated that while her husband was driving on a perpendicular road at an undisclosed speed, entering a highway, the driver yielded; however, a truck in the median was attempting to cross the highway during oncoming traffic, and an oncoming vehicle crashed into that vehicle, causing the truck to crash into the front of the vehicle. The front air bags deployed as intended. The contact stated that an electrical fire started under the center console, and the driver’s shirt was burned by the fire. The Fire Department was on scene and removed the contact from the vehicle; however, a fire report was not filed. An off-duty sheriff witnessed the crash and assisted in removing the contact husband from the vehicle. The driver was taken to the Emergency Room for neck, arm, and wrist injuries, bruises, burns, and scratches. The contact was unsure of how the fire was extinguished. The contact mentioned that the smoke emitting was carbon monoxide-related. The vehicle was towed to an impound lot and was deemed a total loss by the insurance provider. A police report was filed. The dealer and the manufacturer were notified of the failure, and there was a pending inspection on the vehicle. The failure mileage was approximately 6,300.