Toyota Prius Engine Problems

Engine complaints by model year

Which parts fail

• Engine
  70
• Engine › Gasoline
  24
• Cooling system
  19
• Exhaust system › Emission control › Catalytic convertor
  5
• Exhaust system
  4
• Cooling system › Pump
  2
• Engine › Gasoline › Belts and associated pulleys
  1
• Cooling system › Fan
  1

Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).

Mileage when the problem started

• Under 25k
  16928%
• 25k–50k
  6711%
• 50k–75k
  5810%
• 75k–100k
  8715%
• 100k–150k
  13222%
• 150k+
  8314%

What owners report

My 2022 Prius LE hood latch does not work. It does not click and hood stays locked. They told me at Walmart that the hood latch is probably corroded somewhere or defective. It takes two people to open the hood. My vehicle has 54,490mi. This has happened twice now in 2 months. I have not purchased an extended warranty and this is something that should not be happening until over 100,000 miles. I've had this happen on another vehicle that was a Honda but that was because it had a lot of mileage on it. This is just a poorly manufactured defective part that Toyota decided to go cheap on and not make sure it functions past 50,000 mi. I contacted Toyota customer experience and they said that my warranty was expired and they will not be covering it. I told them that they need to make an exception because if I need to change my oil I need access to the engine. …

Carfax notified us that our vehicle was part of a recall on 9/24/21. Toyota never contacted us. I contacted Toyota Corporate the week of Oct. 18th and they contacted the dealer (Hudson Toyota in Jersey City) and the dealer said they had a fix. I brought it in and the service department said there was a mistake and the fix wasn't available. When I contacted them again the week of Oct. 25th they said they had a fix and made me a service appointment on Nov. 9th. However when I went on NHTSA website it says that consumers will only be notified on Nov. 20th and when I called Toyota corporate they could not tell me when the fix would be available. I have not been driving my car and I have been shocked that no one at Toyota seems to be able to tell me anything.

On Saturday [redacted], while shifting to reverse in a back alley to back up slowly, the car engine suddenly and loudly revved and shot backwards at accelerating speed. I slammed on brakes which did not respond at all, thus forcing me to attempt to shift gears which also failed to stop the acceleration. Car only stopped because it went up a curb and hit the corner of a parked vehicle in a neighbors driveway. If I had been on busier street and not a back alley this could have resulted in numerous vehicle collisions and unimagined fatalities. Car is being towed on [redacted] to Advanced Collision Repair on 4511 Central Ave, Columbia Heights, for diagnostic assessment. There were no warning lamps, messages or other indicators prior to this terrifying lack of vehicle control . This was first episode since purchasing car approx one year ago. Incident was captured on neighbor's home camera. …

The contact owns a 2019 Toyota Prius. The contact stated there was a coolant leak and the coolant level was low. There was no indication of coolant on the ground. The check engine and engine HOT warning lights were illuminated. The contact stated that the failure was related to TSB: 0135-19. The vehicle was taken to the local dealer where it was diagnosed that there was a coolant leak in the front exhaust pipe heat exchanger. The parts to repair the vehicle were on backorder. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 95,000.

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 program. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 188,000.

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.

The contact owns a 2017 Toyota Prius. The contact stated while driving 10 MPH and pulling out of a parking lot, the vehicle lost motive power and made abnormal sounds. Several unknown warning lights were illuminated. The vehicle failed to restart, and was towed to the dealer, where it was diagnosed that the head gasket was blown, causing damage to the engine. The dealer informed the contact that the engine needed to be replaced. The vehicle was not repaired. The vehicle was taken to an independent mechanic, where the same assessment was made. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that they could not assist because the vehicle was out of warranty. The failure mileage was approximately 80,000.

The contact owns a 2017 Toyota Prius. The contact stated that while driving approximately 25-30 MPH, the vents were blowing out cold air. The check engine warning light was illuminated. The contact was adding coolant to the coolant reservoir every three to four days. The vehicle was taken to the local dealer, where it was diagnosed and determined that the coolant was leaking into the exhaust pipe. The dealer recommended that the exhaust system front pipe be replaced. The manufacturer was contacted, opened a case, and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 81,700.

Related recalls (2)

NHTSA investigations