Dashboard lights: ABS, Brake, and (!)

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by PriusPlatypus, Dec 24, 2018.

  1. PriusPlatypus

    PriusPlatypus New Member

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    For a couple of months now the ABS, Brake, and (!) lights have been on. There are a couple of things that are affected by this. The brake pedal needs to be pushed harder for them to work, and the battery doesn't gather power when I press the brakes.

    Another strange thing is that the lights go off sometimes. They are usually on, but they will turn off for 20 minutes or so every couple of days. When they turn off, the normal brakes and the battery gathering capability is restored.

    I've looked at other Prius Chat threads but I haven't been able to find anything conclusive. I've heard that it might be that the brake pads or the 12V battery need to be replaced.

    I don't know if it's related, but I also hear a hissing sound coming from the lower front left of the engine compartment. Could it be a broken or disconnected vacuum line?

    Thanks in advance for any replies, and any advice would be appreciated.
     

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    #1 PriusPlatypus, Dec 24, 2018
  2. tankyuong

    tankyuong Senior Member

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    Check your battery voltage then read codes
     
    #2 tankyuong, Dec 24, 2018
  3. bisco

    bisco cookie crumbler

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    I vote brake pads, happy Christmas!
     
    #3 bisco, Dec 24, 2018
  4. Sonic_TH

    Sonic_TH Active Member

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    Hissing sound, mine had that too, and it ended up being the brake booster assembly, though you will need to scan it and read the codes. This is an old thread anyway, but just in case.
     
    #4 Sonic_TH, Apr 13, 2021
    Vincent Sprite likes this.
  5. Vincent Sprite

    Vincent Sprite New Member

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    @PriusPlatypus, Did you find out what the root cause was for this? My 2010 Prius is experiencing the same symptoms.
     
    #5 Vincent Sprite, Feb 12, 2025 at 6:24 PM
  6. Brian1954

    Brian1954 Senior Member

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    His last login to this websie was over 6 years ago, so I do not think you will get an answer.

    Just start a thread for the problems with your Prius. I will tell you that the first thing you need to do is use a scan tool to read the trouble codes.
     
    #6 Brian1954, Feb 12, 2025 at 8:34 PM
    Last edited: Feb 12, 2025 at 8:44 PM
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