Two problems related to computer failure have been reported for the 2005 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Prius based on all problems reported for the 2005 Prius.
The car jumps out of gear, or it won't go into park. But it started to drives away after I got out of the car, or as I was getting out. This happen twice, once at the dealer. The display for transmission position was broken. The same display that shows speed, fuel level and other items was not working. Also, I could not shut off the car or remove the key. The first time it happen was 8/19/2015 at a car wash. The display went dead during the wash. Wile trying to fix the problem, the car drove away in reverse and knocked me over. I had minor injuries. I might have some other problems as a result of that accident. The next day I want to the dealer. Without looking at the car (no computer analysis), the service man told me the display and computer was bad. He said it happens a lot. He also quoted me a price of around $700. I went back to my daughter house to look for another dealer and to research the issue. (I was visiting from CA). At her house, I noticed the car would not shut off and I could not get the key out (the dealer rep told me to put the key in the slot). So I just went back to the dealer to have them fix it and pay the price. (it should be noted that the dealer and its employees never gave me the same information and they wanted me to get so frustrated, that I would leave with the car not repaired. They suggested that I take it somewhere else. At one point, they claimed that I told them I was going to take the car away without the repair. I never said that! they did everything they could to make me mad and so would not fix the car). When I went back to the dealers, the car drive away, again in reverse. I had to hop on one leg to keep up and get back in to stop it. In ether case, I could have been killed. No display, can't shut it off and it jumps into gear!! that is a safety issue! life and death issue it is!.
The vehicle intermittently stalled and decelerated while driving 35 mph due to computer failure. The vehicle stalled while on the highway. The service engine soon light had come on before and remained on after the vehicle failed.