There are 2 owner-reported driver assist & adas complaints for the 2017 Kia Optimain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Twice while driving in rain my front end collision warning has taken control from me and slammed on the brakes bringing my car to a full stop. There was no vehicle or object in front of me either time. The second time I narrowly missed being rear ended.
Cruise control does not maintain a steady speed and constantly fluctuates 10+- miles an hour! The dealer refuses to fix and says they cannot reproduce the symptom. I used a tracker and saw the dealer drive it around the block, never attempting to put it on the freeway.
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