I was sitting in the passenger seat of the car while it was parallel parked. I pressed the push to start button to turn on the battery so I could charge my phone. There was no one in the driver seat. The car turned completely on when I reached over to press the button. Not only did the engine start, but without anyone pressing on the breaks the car released itself from being parked. The car started rolling backwards into the car parked behind me. I have no explanation about how this happened. I have been reading into it and apparently it's a defect of the 2015 and older models. When the car started rolling back I also started pressing both the park and push to start buttons to turn it off again. I've never felt so unsafe in a vehicle and goes to confirm that park and push to start should not be buttons!!! it makes the vehicle much more dangerous not being able to override those commands when it chooses to go on its own.

- Beverly Hills, CA, USA

I applied the brake when the car in front of me stopped suddenly and my car seemed to accelerate and I had to put the brake on again to get the car to stop resulting in a collision. I was driving at a speed of less than 25 miles an hour.

- Austin, TX, USA

The contact owns a 2015 Toyota Prius. While driving approximately 5 to 10 mph and approaching the driveway, the brakes failed. The vehicle accelerated and crashed into a gate. The brake pedal was re-applied and the vehicle stopped. The contact stated that the vehicle traveled 20 feet before it stopped. A police report was not filed and there were no injuries. The air bag failed to deploy. The vehicle was towed to the dealer for diagnostic testing and repair. The vehicle was not repaired. The failure mileage was 17,000.

- Gig Harbor, WA, USA

I have noticed that the brakes sometimes do not appear to work properly, and once I was involved in an accident due to the poor braking performance. Once I quickly transitioned from throttle to full braking and the car didn't seem like it was applying full braking. It didn't seem to decelerate like it should have. I rear ended a vehicle because of the braking performance. Another time I had to slam on the brakes coming off an interstate and the brakes also didn't seem powerful enough. It's as if the brakes don't fully "catch" until the last minute. Both times weather conditions were dry.

- Covington, LA, USA

I was pulling out of a parking space where my front was up against a building with a car on either side of me. I reversed for about 25' where a telephone pole mandated that I make a K-turn to get out. As I switched from reverse to forward, I saw a spark as the car jet-propelled forward. I tried to break multiple times, but the car accelerated the 25' into the wall. All airbags deployed, and fluid gushed out of the front end. The car was declared a total loss. I was told by Toyota and my insurance company that I must have accidentally accelerated instead of repeatedly breaking. I am grateful that I hit a wall instead of people. Someone could easily have died had I had switched from reverse gear to forward in less confined location. The entire accident lasted 2 seconds, with no opportunity to pull the emergency break or go into neutral. Ps: I am a happily married doctor with beautiful children and grandchildren, and not at all suicidal. This three month old 2015 Prius 3 failed before the first oil change. I am not satisfied with the results.

- Frederick, MD, USA