*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Engine
I am writing to inform you about a very dangerous situation that occurred to me in June 2026 and that could pose a significant safety risk to other drivers who own 2016-17-18-19 Toyota Prius cars. The risk stems from a defective part (the catalytic converter) that Toyota Corporation knew about in 2019 but failed to notify owners of those models.   Instead of issuing a recall and replacing the defective part, Toyota chose instead to issue a nationwide alert to their mechanics (Technical Service Bulletin (TSB)â0135-19, issued on 9/27/19). Through the TSB, Toyota extended the warranty to 8 years or 80,000 miles for the part. However, Toyota never notified the car owners of this…
Jun 23, 2026Engine and engine cooling
The contact owns a 2018 Toyota Prius. The contact stated that while having a routine oil change, the contact was made aware that there was no coolant in the coolant reservoir. No warning lights were illuminated. The contact was constantly adding coolant to the coolant reservoir; however, the following day the coolant reservoir was empty. The failure had occurred on several different occasions. The vehicle was taken back to the residence. The vehicle was not diagnosed or repaired. The contact researched and was made aware of TSB Number: 013519; however, the VIN was not included. The manufacturer was notified of the failure. The failure mileage was approximately 89,100.
Jun 1, 2026 · 89,100 milesEngine and engine cooling
The contact owns a 2018 Toyota Prius. The contact stated that while driving at an undisclosed speed, the engine constantly overheated. An unidentified warning light was flashing on the instrument panel. An independent mechanic inspected the vehicle and became aware that the coolant reservoir was empty. One month later, the same failure reoccurred. A second independent mechanic inspected the vehicle, and the coolant reservoir was empty. The vehicle was taken to a dealer. The dealer diagnosed the vehicle with a coolant leak into the head gasket. The dealer advisor referenced a customer satisfaction program as the cause of the failure; however, the vehicle was over the mileage limit for the…
May 6, 2026 · 188,000 milesExterior lighting
Both taillamps holding moisture. Could cause electrical issues or fire. .. same year and model car have same reported issues and were fixed by manufacturer. This vehicle is the same but different level.
Mar 5, 2026Electrical system
Driver door lock actuator not working. This seems to be a common problem for Toyota over the last decade, but they yet to put more vehicles to their recall list. Actuator just stopped working. I have to use key out of FOB to manually open. This is a safety issue if Iâm trying to get in my car quickly for safety reasons and it does not open.
Dec 31, 1969Latches/locks/linkages
The contact owns a 2018 Toyota Prius. The contact stated the trunk opened at a slow speed and failed to remain open. The dealer was contacted and informed of the failure. The dealer informed the contact that the vehicle needed to be taken in to be inspected. The vehicle was not diagnosed or repaired. The manufacturer was informed of the failure and confirmed that the VIN was not covered under recall. The manufacturer directed the contact back to the dealer for assistance. The failure mileage was approximately 160,000.
Jun 2, 2025 · 160,000 milesVisibility › Rearview mirrors/devices › Exterior
Was driving around 35 mph and my right side mirror blew up. The back blew off and the mirror was shattered and hanging. Nothing hit it. Contacted Toyota and the parts have been on a stop, but there is no recall. It has been 4 months.
Dec 10, 2024Engine
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.
Feb 3, 2025 · 89,682 miles
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.
