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10 complaints
GMC TERRAIN 2026 SERVICE BRAKES
low
ABV came on. SCR alerted I needed service. On a 25 mph road I no longer could brake randomly
NHTSAUSJun 2026Source →
GMC TERRAIN 2026 POWER TRAIN
medium
The contact owns a 2026 GMC Terrain. While driving at 28 MPH, the RPM became elevated to over 3,000 RPM. There was no warning light illuminated. The contact immediately pulled over and then resumed no
NHTSAUSJan 2026Source →
GMC TERRAIN 2026 SUSPENSION
medium
The contact owns a 2026 GMC Terrain. The contact stated that there was an abnormal clunking sound coming from the front driver’s side suspension while driving over bumps in the roadway, and while br
NHTSAUSJan 2026Source →
GMC TERRAIN 2026 UNKNOWN OR OTHER
low
Purchased NEW 2026 GMC Terrain Elevation, and it came with NO User Manual. I was told by the dealership (Al Serra GMC in Grand Blanc Michigan that i could either purchase one for $50.00+ dollars, PLUS
NHTSAUSJan 2026Source →
GMC TERRAIN 2026 FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
medium
The system that failed was the brakes, The car is availble for inspection. My saftey and others was put at risk due to not having brakes to stop. The problem has been confirmed by a dealer as a ma
NHTSAUSDec 2025Source →
GMC TERRAIN 2026 POWER TRAIN
low
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 f
NHTSAUSDec 2025Source →
GMC TERRAIN 2026 ELECTRICAL SYSTEM
low
The vehicle has been taken to the dealership at least 4 times. Each time for the same reason: when driving at 65 or higher, it sounds like it's on a flat. My screen also glitches when foot is taken of
NHTSAUSDec 2025Source →
GMC TERRAIN 2026 UNKNOWN OR OTHER
low
I have brand new GMC Terrain 2026, I leased dog on Aug 4th 2025. After one week into driving the vehicle, OnStar, GPS NAV stopped working and the Emergency calling is not working. All features related
NHTSAUSAug 2025Source →
GMC TERRAIN 2026 SERVICE BRAKES
low
Master cylinder , less then 1000 miles was pulling out of a parking lot and the brakes went out
NHTSAUSAug 2025Source →
GMC TERRAIN 2026 UNKNOWN OR OTHER
medium
Very soon after purchase vehicle developed a front end shake and continued to get worse. This happens when pulling out or in stop and go traffic this varies from in intensity and sometimes it can be q
NHTSAUSJul 2025Source →