Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2009 Toyota Prius owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2009 Toyota Prius. The contact stated that the instrument cluster was intermittently inoperable. The contact stated that the failure had been recurring increasingly. Additionally, the contact stated that the vehicle would fail to start or to turn off intermittently while pressing the Push to Start button. The contact stated that the vehicle would respond as needed after several attempts. The vehicle was taken to an independent mechanic, where it was diagnosed that the instrument panel combination meter had failed and needed to be replaced. The mechanic related the failure to Toyota Campaign Number: ZTV and referred the contact to the dealer for the repair. The dealer was contacted and informed the contact that the repair could not be covered under Toyota Campaign Number: ZTV. The vehicle was not repaired. The manufacturer was not notified of the failure. …
The contact owns a 2009 Toyota Prius. The contact stated that while operating the vehicle, the instrument panel lights would turn off and no instrumentation could be accessed or read. The failure was intermittent, and finally got it to shut off after trying many different things. Consumer had a hard time turning off the car. The cause of the failure was not determined but the contact was informed that a manufacturer's extended service which addressed the failure was available from the manufacturer. The manufacturer and dealer were contacted but no assistance was offered. The failure mileage was 215,000.
The contact owns a 2009 Toyota Prius. The contact stated that while driving at an undisclosed speed, extra effort was needed to stop the vehicle while depressing the brake pedal. In addition, the contact stated that the instrument panel intermittently went blank and failed to operate as needed. The vehicle was taken to an independent mechanic where the contact was informed that the ABS and the instrument cluster needed to be replaced. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 157,000.
The hybrid water pump failed/ aka the inverter coolant pump. This was recalled years ago and has failed again. The previous owner of my car replaced it in 2013, so Toyota is refusing to replace it again, despite the fact that the part is faulty and has compromised the safety of my vehicle. This issue was diagnosed by a mechanic yesterday, error code P0A93. The master warning light, check engine light, brake light came on. The AC stopped working. The brakes nearly gave out on me driving on a bridge in New York City. This part was recalled. Toyota refuses to honor the recall a second time. They clearly did not properly engineer this part! It failed again! They should be responsible for fixing this issue.
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.
My 2009 Toyota Prius abruptly lost power while driving. The electrical system turned off and the vehicle stalled while going 50 mph on a 2-lane parkway. While I was able to put my hazard lights on and steer the vehicle, I had no other control and was at a high risk of a crash. There's no emergency lane and few areas wide enough to pull over on the parkway. I was forced to coast the vehicle until I could pull off the parkway onto a patch of grass off the busy road. There were no warnings, messages, or other symptoms of the problems prior to failure. I had plenty of gasoline in the tank, so it wasn't due to a lack of fuel. The car would not start after pulling over and I had to get towed. …
Tl* the contact owns a 2009 Toyota Prius. The contact stated that a warning indicator flashed on the instrument panel regarding the brake system when the brake pedal was depressed. The contact also noticed smoke coming from the exhaust system. The contact inspected the vehicle and found a leak underneath the vehicle. The vehicle was taken to salinas Toyota (700 auto center cir, salinas, ca 93907, [phone]) where it was diagnosed that there was an internal brake fluid leak; however, the vehicle was excluded from the manufacturer warranty campaign. The manufacturer indicated that the obt2 sensor did not show the specific diagnostic trouble code (DTC) to receive the brake actuator replacement covered by the campaign. The dealer and the manufacturer refused to honor the warranty campaign for DTC number: c1240. The approximate failure mileage was 115,000. …
Tl* the contact owns a 2009 Toyota Prius. The contact stated that the vehicle suddenly exploded and burst into flames without warning. The contact stated that the vehicle was securely parked for six weeks while the contact was away. The police and fire departments were at the scene, but no reports were filed. There were no injuries. The dealer was not contacted. The manufacturer was made aware of the failure and provided the contact with a case number. The failure mileage was approximately 100,000.
Tl* the contact owned a 2009 Toyota Prius. While driving 30 MPH, the rear passenger side of the vehicle caught fire. There were no injuries. The vehicle was destroyed and towed to the impound lot. The manufacturer was notified of the failure. The failure mileage was 80,000. The VIN was not available.
I was driving my 2009 Toyota Prius on a very cold day (roughly 10 to 20 degrees f). The red brake warning light was on, along with the ABS, vcs and yellow "!" lights. The brakes were extremely soft for about the first 5-10 minutes of operation. I would push the brake pedal as far as it would go (it would not go all the way to the floor) and the brakes would seems to be engaging at about 30%-50% of their normal stopping power. After the vehicle warmed up, the warning lights on the dash went away and the brakes began operating normally. The following week, my wife was driving the vehicle on another very cold day (again probably about 10 degrees). She stated that the above mentioned lights stayed on for her entire commute (less than 10 minutes) but that when she arrived to work, her brakes were not working. …
NHTSA investigations
Pedestrian alert sounds
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles.
Electrical complaints in other Prius years
Frequently asked questions
How common are electrical problems on the 2009 Toyota Prius?
NHTSA has 60 complaints about the electrical system of the 2009 Toyota Prius, 12% of the model year's 502 complaints. The component named most often is instrument cluster/panel (4 mentions).
Is there a recall for 2009 Toyota Prius electrical problems?
No. NHTSA lists no electrical system recall for the 2009 Toyota Prius, though it has 6 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2009 Toyota Prius electrical problems start?
Half of the complaints with a recorded mileage happened before about 90,000 miles, and 22% before 25,000 miles.
Is it dangerous?
Owners linked 2 crashes, 4 fires and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.