There are 2 owner-reported driver assist & adas complaints for the 2018 GMC Terrainin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
It starts to “warn” you by the seat doing whatever it does and the dash lights up collision flashing and slams on the brakes when nothing is even around
I was in a car accident
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 26, 2026