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 2007 Toyota Prius owners, lightly cleaned up (personal details are redacted by NHTSA).
Under hard braking (over 50% of the pedal) the front passenger wheel applies all the force to stop the car to that one tire causing it to lose traction and skid. Brakes are insufficient to properly stop the vehicle and no warning lights are illuminated on the dash. Actually more than half of the time the whole dash does nothing, no MPH, no gas gauge, nothing but a blacked out information less panel. Then to top it off the car only has one headlight bc it blows what ever headlight I put into the ballast. 3 of the most common failures for a 2007 and my Prius has a grand slam assortment of serious potential life threatening problems that should have been repaired (never should have been assembled with) by Toyota. Minor wreck when attempting to stop the car under not driving conditions. …
The contact owns a 2007 Toyota Prius. The contact stated that while at a stop light, she attempted to drive however, the vehicle failed to exceed 25 MPH. The HC battery, ECU, and check engine warning lights were illuminated. The vehicle was towed to an independent mechanic, who informed the contact that the vehicle displayed DTC code: P3190 (Engine Failure). The vehicle was towed to the local dealer, where it was diagnosed that the hybrid battery was severely drained, and the mechanic retrieved DTC codes: P3000 and P0A80 for the hybrid battery pack. The vehicle was not repaired. The vehicle was towed to another independent mechanic, who replaced the battery, but the failure persisted. The manufacturer was contacted, but no additional assistance was provided. The failure mileage was approximately 160,000. …
Instrument panel cluster failure. Panel goes black while driving and lose power. Vehicle won't start or shut off. My vehicle was getting serviced at the dealership and they couldn't start the vehicle. I was told the instrument panel cluster was the problem. I contacted Toyota Customer Service, and was told they were aware of the issue. They had issued an extended warranty and sent out a letter to all owners this warranty has expired in 2016. If you purchased your vehicle after 2016 you would not have received any notice regarding this. While driving you can't see you speed, your gear selection, fuel level, lights and no warning lights. The warning is that your vehicle won't start or shut off.
Combination meter often does not turn on when turning the car on. This means you cannot see a speedometer, any warning lights, fuel tank levels, or mileage. Also the trunk gets locked and is unable to open. Sometimes the car will not turn off. This has been happening on and off for over a year but has gotten increasingly worse. There are no warning signs. This can happen any time you turn on the car but might not always happen. It can also prevent you from turning off the car. When searching online, it seems this is a common problem with high mileage Priuses between 2005-2009 and so Toyota extended a warranty on it but did not tell all of the owners, most likely to get out of a recall.
I was driving and all of my dashboard lights disappeared, I couldn't see anything. I was suddenly driving blind. I pulled over but the car would not turn off. I tried again and again, but it would just not turn off. I called Toyota corporate they asked how far I was to a Toyota dealer and told me to take it there immediately. They gave me a case number 220322000191. When I got to the dealer, they said I would have to pay $150 for a diagnosis. I left it there and am now reporting this. There should be a recall on these vehicles, this is extremely dangerous.
instrument cluster panel goes completely out and blank, speedometer lost, and dash lights gone and causing other issues such as not being able to turn off vehicle, loss of cruise control, unable to open trunk, navigation screen unable to turn off, backup camera not functioning, front lights going on and off while driving at night.
The Dash display (shows the speedometer, warning lights, etc) won't come on, and the rear back up camera doesn't either. They seem to both stop at the same time on start up. The car seems to run fine otherwise.
After I had auxiliary battery replaced at a Toyota dealer 10/13/21, I started noticing that intermittently, when I turned the car on that the lights on my instrument panel would not be lit (can't see speed, odometer, gas gauge). Then noticed other strange things when the instrument panel was dark, such as the back-up camera would not work, had a hard time turning the car off, and back trunk hatch would not open. Took it back to dealer on 11/12/21, thinking problem was related to the battery replacement. First service advisor said that it was the combination meter...that they see it all of the time with Prius'. While waiting for my car, I googled "combination meter" and saw how ultimately dangerous its malfunction could be over time - e.g. the electrical braking system fails and you have to use your emergency brake to stop the car, which would be exceedingly dangerous at 65 mph. …
When the 12-volt battery in this car dies, there is NO warning light to indicate the battery is dead or is running low. The driver is given no warning or indication prior to the car being disabled. Once the battery dies, the vehicle immediately decelerates, there is no acceleration, the braking system becomes mostly disabled, and the power steering is not functional. The car becomes disabled, while being driven, without warning. When this event happens, there is a high pitched screaching alarm, and the majority of the dash lights turn on. None of which indicate there is an issue with the 12-volt battery. The large red triangle light with the exclamation mark comes on, as well the lights indicating that there is a problem with the brakes. Additional dash lights also turn on during this dangerous event. The rear view monitor screen states that there is an issue with the transmission. …
Multi functioning display failure: touch screen for climate controls failed to work. Defrost became unusable (during rain/cold conditions), causing car to veer off road due to diminished road visibility. This screen sporadically ceases to be functional.
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 2007 Toyota Prius?
NHTSA has 248 complaints about the electrical system of the 2007 Toyota Prius, 12% of the model year's 2,003 complaints. The component named most often is 12v/24v/48v battery (5 mentions).
Is there a recall for 2007 Toyota Prius electrical problems?
No. NHTSA lists no electrical system recall for the 2007 Toyota Prius, though it has 4 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 2007 Toyota Prius electrical problems start?
Half of the complaints with a recorded mileage happened before about 67,000 miles, and 9% before 25,000 miles.
Is it dangerous?
Owners linked 5 crashes, 0 fires and 1 injury 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.