2026 GMC Terrain

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.

NHTSA ID

11755239

Incident

Jun 25, 2026

Mileage

11,350 mi

At 12,000 miles removed old air filter found grass under air filter

NHTSA ID

11754857

Incident

Aug 3, 2026

The Screen calls my own phone number and hangs up over and over if I just ended a call. I am not able to use any part of the screen afterwards such as my map. It stays like that until I disconnect the Bluetooth and wifi from my phone while trying to drive. Safety issue!

NHTSA ID

11748887

Incident

Jun 26, 2026

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?

NHTSA ID

11748269

Incident

Feb 14, 2026

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.

NHTSA ID

11745975

Incident

Jun 16, 2026

Mileage

6,300 mi

ABV came on. SCR alerted I needed service. On a 25 mph road I no longer could brake randomly

NHTSA ID

11745358

Incident

Jun 20, 2026

The car has always had an issue where it would just get stuck in a low gear and RPMs would go high. Does this every single day. But recently it also started acting like it was put into neutral for a few seconds and then back into drive.

NHTSA ID

11737215

Incident

Dec 1, 2025

Two issues here. First is that the car will give a danger warning when nothing is there. Sometimes goes as far as slamming on my breaks. Both in drive and reverse. Second is the lane keep assist. It’s like it is working backwards. I turned this all off because it would jerk me out of the lane and into the other lane or off to the sides of the road.

NHTSA ID

11737214

Incident

Dec 1, 2025

• Smoother vehicle startups in cold temperatures

This PI advise dealers If U3000 is present, follow the correct service doc by Symptom Byte before contacting PQC; if not present, verify the camera is clean, then contact PQC if no issue is found.

PI to help diagnose A/C concern

• Improvements to the performance of driver assistance features • Fixes to help ensure accurate driver display messages and alerts

This Preliminary information communicates an issue with an OTA pending message still displayed after an OTA event and how to reset/clear the message.

This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.