There are 2 owner-reported engine complaints for the 2018 Toyota Priusin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2018 Toyota Prius. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer where it was diagnosed with a failed heat exchanger, catalytic converter, and exhaust system. The contact was informed that the heat exchanger, the catalytic converter, and the exhaust system needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 89,682.
TL* THE CONTACT OWNS A 2018 TOYOTA PRIUS. WHILE DRIVING 20 MPH, THE ELECTRICAL SYSTEM FAILED AND EVERYTHING IN THE VEHICLE SHUT DOWN. THE VEHICLE DECELERATED AND LOST POWER. WHILE THE VEHICLE COASTED, THE ENGINE RESTARTED ON ITS OWN. THE VEHICLE WAS DRIVEN TO TOYOTA VALLEJO (201 AUTO MALL PARKWAY, VALLEJO, CA 94591, 707-552-4545) TO BE DIAGNOSED, BUT THE FAILURE COULD NOT BE REPLICATED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 8,600.
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 May 4, 2026