2018 Toyota Prius Problems & Recalls
Comprehensive defect analysis based on official US Federal safety databases.
2018 Toyota Prius Top Failure Categories
Distribution of driver complaints across vehicle components according to federal taxonomy.
Official Safety Recalls for 2018 Toyota Prius (1)
Defect Summary: Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2016-2018 Toyota Prius vehicles. A portion of the engine wire harness connected to the hybrid Power Control Unit (PCU), could contact the cover at this connection and wear, causing an electrical short circuit.
Safety Hazard: An electrical short can increase the risk of a fire.
Free Remedy: Toyota will notify owners, and dealers will inspect the engine wire harness assembly and replace it if damage is found. A protective sleeve or protective tape will be included to prevent any future damage. These repairs will be performed free of charge. The recall began October 30, 2018. Owners may contact Toyota customer service at 1-888-270-9371. Toyota's number for this recall is J0T.
Verified NHTSA Owner Complaints
Excerpts of actual incident reports submitted to the federal Office of Defects Investigation (ODI).
"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. ..."
"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 failur..."
"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. ..."
"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."
"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 I’m trying to get in my car quickly for safety reasons and it does not open."