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High pitched whine and warning lights

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by bizpm, May 18, 2023.

  1. bizpm

    bizpm Junior Member

    Nov 10, 2007
    My daughter, a young driver, is currently in rural Maine with her 2004 Prius--with 160K miles. It went to the shop last week, before heading out on a 1200 m trip, and was given a clean bill of health (it's had a TON of work, including new 12V and new hybrid battery already).

    So she got to Maine last Thursday and the dash lights went out and the car wouldn't turn off. That smells like a combination meter--based on our experience with another Prius--so we ordered the part and scheduled service.

    Two days later the dash lights came back on. Of course.

    This afternoon, she turned the car on and the !! light and the ABS light came on and the car made this sound:

    She said the car FELT like the brakes weren't working right.

    We walked her through reading codes on the reader in the car. There were none.

    She drive the car to AutoZone. They found no codes either.

    Does anyone know what this likely is?

    How dangerous is this car?

    She is supposed to be starting a new job in upstate NY next week and she'll be in VERY remote locations most of the summer.

    #1 bizpm, May 18, 2023
    Last edited: May 18, 2023
  2. JC91006

    JC91006 Senior Member

    Nov 10, 2013
    Los Angeles, CA
    2008 Prius
    If I had to guess, it would be the brake accumulator/actuator that is not working. This is a failure that is very common on older Prius cars. But if she drives it over to the dealer, they surely will have equipment to read the codes. Repair on this is upwards of $2500,