2014 Toyota Prius engine problems

Filed Mar 15, 2026 · Engine · PA

the cylinder head gasket blew because of the poor design of the intake manifold and the EGR system. There are updated parts to fix this issue, but there was no recall. This poor design led to the vehicle having "the Death Knock." It started doing this knock on my trip driving my daughter to college. The engine could have seized in traffic on the way to [XXX] from [XXX] . No warning lights came on telling me there was an issue. The vehicle is being taken apart now to see if my connecting rods were bent from the coolant entering the combustion chamber. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Mar 2, 2026 · Engine · GA

Head gasket failure. No check, engine, light or warning. My car was very well maintained regularly. After research, I found this to be a very common problem. Yes it is available for inspection. Upon request. The problem was confirmed by chemical test, ignition vapors going into engine coolant. Other symptoms were misfiring on cylinder two and cylinder four. Severe engine knocking.

Filed Dec 20, 2025 · Engine, Fuel system · AZ

misfire code along with rough starts/light load. T-SB-0116-15

Filed May 18, 2024 · Engine · ME

2014 Toyota Prius: While driving at high speed the engine stalled unexpectedly, steering and braking were not effected. Was able to safely coast to a stop in the breakdown lane and after a few minutes, restart the engine and proceed driving. Another event occurred on the entrance ramp onto an interstate highway. I was able to pull over safely and the car restarted after a short delay. This seems to be a very dangerous condition. Toyota dealer service said they could not determine the cause and they know of no recall. I found online a reference to the federal safety agency Recall # 20V369000 that referred to "unexpected hybrid power system shut down." That is what happened to me.

Filed Jan 28, 2023 · Engine · CA

The car has oil consumption and over heat the try to fix it but no no one can d it so far

Filed Jun 27, 2022 · Electrical, Engine · TX

The air temperature was probably about 50 or 60 F. On a route I routinely drive , I accelerated up hill normally from 0mph to about 45 to 55 mph. I did not accelerate aggressively. Just after climbing the short hill, The engine suddenly loses all power. I had to pull over. I look under the engine to find five pieces of metal blown out of the bottom of the engine block above the oil pan and oil spilling out onto the ground. The car has about 98,000 miles on it and was maintenance regularly including on schedule oil changes, coolant change, state inspections. There were no check engine lights or electronic error codes to indicate anything was wrong with the vehicle which I would have been able to diagnose and possibly fix. The car had been maintenanced in August/September for winter by myself. On the last maintenance, oil was discovered inside the engine air manifold and throttle body that had to be cleaned out and (The EGR was also moderately carbon clogged). I'm very dissatisfied with how Toyota handled my case. They called twice to ask when I wanted to schedule my next service appointment when they had the car sitting on their parking lot for three months. I also wrote them a detailed email similar to this report asking how Toyota could help and that I could not afford to buy another car. The engine failed and it can be inspected upon request. The vehicle had complete loss of power. The vehicle was towed to the nearest dealer. I have seen videos on youtube.com that show other people replacing blown prius engines and head gaskets. You would see chunks of metal missing from the engine block. The vehicle was not inspected by the manufacturer police or insurance. I could have been hit by another car from behind especially if the hill were longer like on a mountain side or some other situation. Separate issue: Mice enter the two rear ventilation openings to nest in the car. Mice chewed on of the oxygen sensor wires to cause an electrical fault.

Filed Jul 29, 2021 · Electrical, Engine · CA

Originally, Toyota issued a safety recall in 2014 to address the inverter defect in model years 2010 to 2014, an attempt to fix the problem on about 800,000 cars in the U.S. by modifying software that controls the hybrid electrical system. It was intended to fix the overheating problems. The inverter controls the power flowing between the battery and electrical motors. The inverter boosts the battery from 200 - 500 volts. They inspected my car saying it was in excellent condition. After, the software upgrade i had major problems. My original Prius battery with around 65,000 miles stopped holding a charge. My 12 volt battery also died shortly after. And my power outlets in my got super hot and spiratually worked off and on. And my driver seat gets hot when i turn on car even though seat button is off. I am sweating all the time. Plus, i have skin conditions and asma. I talked to dimitri, and they tried to charge me 1200for unnecessary repair. Also, failed to call the federal safety agency as promised

Filed Dec 26, 2019 · Engine · 125,000 miles · FL

Car is burning oil internally. Oil is burning up in 4 week s tume

Filed Jul 26, 2019 · Engine · 63,000 miles · VT

Tl* the contact owns a 2014 toyota prius. While driving 40 MPH, the vehicle stalled on the road. The contact was able to veer to the shoulder of the road. The vehicle was later towed to white river toyota (303 sykes mountain ave, white river junction, vt 05001, (802) 299-2800) to be diagnosed, but the failure could not be duplicated. The mechanic also stated that if they could not duplicate the failure, then there was no failure. The vehicle was not repaired. The manufacturer was made aware of the failure and provided a case number. The failure mileage was 63,000.

Filed Feb 14, 2019 · Engine · 124,491 miles · CA

I was driving suddenly I started to lose power within few second the car stalled and got an hybrid error and the car went in safe mode the car doesn't go in d only n or p, also the dashboard lighting goes on and off and smoking so I towed the car to larry h miller toyota corona ca, the manage dustin said this is recall issue and we need to update the software two days later the service agent mrs lorena said we found coolant in the oil and our service tech thinks I have blown head gasket but talking with toyota manufacturer is covered and I can get rental car too but I need to authorise $2040 year down because toyota wants to know what cause the head gasket to failed but mrs lorena assured me 'I 100% covered and I will not have to pay' so I agreed two days later dustin the service manager called and said I need to come to dealer shop he wants to show me something so I had to call the base (air force) and get half day off when I got there my car was disassembled except I could see the pistons and the block toyota tech had rulers and fillers gage and showing me that my block is warped about 0.008 inch and I need a new engine around $11,000 or used about $8,200 or I can take my car as is without paying anything I told I cannot affords it so I towed the car home, prior to becoming an engineer I was machinest so I sent the head to machine shop for examination the cylinder head was flat and has no crack or sign of failure and made of aluminium if the block is warped the head should be warped too and the tech measurements was incorrect because after cleaning the block surface from gasket debris was flat too so I called the dealer about my finding I was told dustin is in vacation and coming back on 2/12/2019 today is 2/14/2019 and he is not returning my call I took the car running but doesn't go to drive for recall now I have disassembled car. This is 2nd time hybrid issues.