Ten problems related to power train have been reported for the 2009 Toyota Prius. The most recently reported issues are listed below.
The car stopped moving while I was driving. The engine is functional but it will not engage the drivetrain. The dashboard lights up intermittently. Most of the time the dash is dark. The local Toyota dealer will not take this car into the service department since it is over 10 years old and the dealer has not done all the regular servicings of the car. So I can not drive it.
Tl-the contact owns a 2009 Toyota Prius. The contact stated while driving at unknown speeds the temperature gauge increased to high. In addition coolant needed to be . Added. All of the instrument cluster lights were illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted but no further assistance was provided. The failure mileage was 151,779. Ap.
Complete shutdown of Prius automobile with no warning while in motion on a city street. Rolled to a stop in safe area. Nothing worked except emergency blinkers. No instrumentation or warning lights appeared. The car was locked in fwd park and could not be towed by flatbed tow truck as there is no override. Lift tow truck was used to get to dealer. Diagnosed as melted hybrid invertor pump. Dealer replaced pump and fuse for a $641. 47 cost to me. If this had happened on a highway/freeway it would have been a disaster. The complete loss of power without warning at freeway speed could very easily ended up as a multiple car pile up. Just the thought of crossing multiple lanes in traffic with no power, just rolling, makes me think it's time to get rid of this car.
This car cuts off power to save the powertrain from damage, that is what Toyota told me. You must be extremely careful when entering traffic because you can lose power for 2-3 seconds if the cars computer senses any wheel spin. The way I see it this is a machine that was designed by the engineers to save itself from damage, the safety of the driver is of no concern to the computer program. You must always!!! be aware when driving this car that it can and will cut all power when you enter traffic. The best way to drive this car and stay alive is to make sure any approaching vehicles are much farther away than you would consider normal if you were driving any other car. Imagine in the future that a firefighting robot runs into a burning building to save you, the robot picks you up and starts to exit the building. The robots computer senses that it is getting too hot for its design parameters so it drops you on the floor and runs out of the building to save itself, that analogy basically describes the 2009 Prius , its computer saves itself without thought that you are left in the middle of the road without power. Toyota told me again that the transmission could not handle the power from the motor so they made the computer cut power if wheel spin was detected. My major complaint is the length of time the power is cut 2-3 seconds which is a very very long time when you are entering traffic.
Service engine light, code p1121, coolant recovery tank flow control valve bad. There is a service campaign on this for 2007 Prius and the problem is supposed to be solve for 2009 Prius. Also this is part of the emission control system, as the purpose of coolant recovery tank is the warm up engine sooner to pass emission test. Called Toyota dealer, not covered by emission warranty. This is a known and very common problem and Toyota is dragging its leg on it.
While engine running and in parked mode, engine suddenly raced as if gas pedal was depressed and vehicle lunged forward a few inches.
While driving a 2009 Toyota Prius at 50-55 mph on a single lane highway outside of prescott az, the drive system suddenly shut down and no response was felt when depressing the accelerator pedal. Lots of indicators came on and my wife was able to steer the car to the side of the road where there was just sufficient room for following traffic to go past. After spending a few minutes going through the owner's manual and finding no easy answer to explain this condition, we tried and were able to re-start the car. It must be noted that the fuel gauge when recently checked had indicated slightly less than 1/4 full and that we were proceeding up hill when the event happened. No add fuel indicator light nor low fuel alarm had occurred prior to this event. When the car was restarted it was on a more level but not flat surface. We proceeded on our travel with the flashers on and at a speed no higher than 30-35 mph. Soon thereafter we did observe both an add fuel indicator light and then a flashing light on the fuel gauge itself. We stopped at the nearest gas station and added fuel. The next day we took the car in to the Toyota dealer to have them look at the fuel gauge and electronically recorded history. The report showed that the car responded to an empty fuel tank by shutting if the engine and then the battery drive when its charge went too low (to protect the battery). We were told the this car has a bladder type fuel storage device and that it can act funny when it gets low. The car was checked out fine and returned to us with the words no wisdom to not let the car get too low on fuel. My concern is that the engine and drive systems shut down under high speed driving conditions without any low fuel warning indicators being activated.
Loss of engine power in 2009 Toyota Prius. When accelerating into traffic in wet or low traction conditions every time one of the front wheels looses traction, the engine abruptly goes to idle for 3 seconds and the car severely decelerates. Only by removing your foot completely from the gas pedal and reapplying throttle will the car start going again. This extreme over-reaction of the traction control system is very dangerous in traffic. This over-reaction is most pronounced if turning to the right when a front wheel starts to slip. There should be a way to turn off the traction control system manually.
When putting the Prius into park and shutting off the car, it rolls back every time. Putting on the emergency brake helps but it still rolls. Also putting the car into neutral (ie going through a automated car wash) the car does not stay in neutral, it pops out and is very hard to put back into neutral.
2009 Toyota goes forward when I put it in reverse. I apply brakes, try again, and it goes into reverse, sometimes after two tries. Toyota service here claims they can't reproduce this. I don't believe them. It doesn't do this every time, but most times. Afraid to parallel park. Have you heard this one?.