There are 3 owner-reported engine complaints for the 2024 GMC Terrainin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Check engine light is coming on, indicating reduced engine power. Took vehicle to GMC dealer and they advised that the repair shop was getting assistance from the GMC Tech line to update a module to correct the issues. I was informed today that the high pressure fuel pump will have to be replaced, along with a hose or pipe to correct the issue. The vehicle has 57k miles on it. Upon researching the issue, I found that this has been a persistent issue with this model vehicle, dating back to 2020. It appears that it has not been resolved and the vehicles could stall or stop at any time. There is currently a class action lawsuit pending on this issue. Please help, this is dangerous
On Febuary 14 2026 I was driving on the feeder of the freeway with speeds of 50 mph my car suddenly down shifted in the middle of driving started shaking real bad stalled wouldn’t start wouldn’t go in gear at all would just die and say engine power reduced. This is after it had just been at the dealership and they said all I needed was an update. It had to be towed and the dealership said it was my high pressure fuel pump had failed. They replaced it and gave me the car back. I staled the next morning going to work on the freeway going 70 mph same exact thing happened except this time I could smell gas so strongly. I had to sit on the side of the highway until it was picked up due to gas smell and fear of fire. They say a bolt broke off of the high pressure fuel pump they just installed
The contact owns a 2024 GMC Terrain. The contact stated that while the vehicle was parked, the check engine warning light illuminated. The contact stated that while driving at an undisclosed speed and merging onto the highway, the vehicle experienced a loss of automotive power. The vehicle was taken to a local dealer where the vehicle was diagnosed. The contact was informed that an undisclosed faulty sensor was the cause of the failure. The contact was informed that the sensor needed to be replaced. The contact stated that the vehicle had remained at the dealer for two weeks unrepaired. The manufacturer was not notified of the failure. The approximate failure mileage was 22,000.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026