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Brake, ABS, and skid lights all came on

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by bobbintb, Aug 10, 2024.

  1. bobbintb

    bobbintb Junior Member

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    I have a 2012 Prius and last night when I was driving the brake, ABS, and skid lights on the dash all came on at once and have stayed that way. I assume a sensor or something went out. I'm mainly concerned with the cost of fixing it. I can do it myself if need be. It just depends on the time and cost as to whether or not I do it myself or have someone else do it.
     
    #1 bobbintb, Aug 10, 2024
  2. bisco

    bisco cookie crumbler

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    not much you can do except take it somewhere that has a prius aware scanner (like a dealer)
    the codes and service manual will help them find what is wrong and give you a repair price.
    hopefully just a wheel speed sensor or similar.
     
    #2 bisco, Aug 10, 2024
  3. Air_Boss

    Air_Boss Senior Member

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    Check underneath, at each wheel, to see whether a wheel speed sensor pigtail became loose or disconnected from the body harness. If you’re not sure, disconnect and reconnect the pigtail to the wheel sensor.
     
    #3 Air_Boss, Aug 10, 2024
  4. rjparker

    rjparker Tu Humilde Sirviente

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    Lots of brake boosters (master cylinder with ecu) go bad. They were part of an extended warranty for 10 years or 150k miles. See attached.

    For a 2012 that warranty has expired but occasionally Toyota has made exceptions. Otherwise it is around $2500 installed at a dealer with no easy aftermarket options. Hybrid Pit in Southern California has a rebuild service using your Brake Booster for less than $600. However this will have your car down for an extended period.

    Some buy the part for $1100 and install. It requires Techstream or a high end scanner to set it up.


    Pine Hollow Diagnostics
    Prius Brakes FAIL (Hidden COST of Hybrids)



    47050-47110 Cylinder Assy Mcgeorge 47050-47110 - Master Cylinder Assembly 2012-2014 Toyota Prius V | Ourisman Toyota Parts

    44785-02060 Gasket, $5

    00475-1BF03 Brake Fluid $13
     

    Attached Files:

    #4 rjparker, Aug 10, 2024
    Last edited: Aug 10, 2024
  5. ChapmanF

    ChapmanF Senior Member

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    ^ This. The warning lights only tell you that the trouble codes have to be read. There are a couple hundred possibilities that all turn those lights on, and some are expensive and some are quite readily fixable, so it doesn't pay to guess and worry.

    However, you are not limited to taking the car somewhere that has a scan tool. If you don't have a suitable tool yourself, you can get the trouble codes from those lights without one, like this:

    Blink (a/k/a Flash) Codes – How to. | PriusChat
     
    #5 ChapmanF, Aug 10, 2024
    bobbintb likes this.
  6. bobbintb

    bobbintb Junior Member

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    Well I found my scanner and it says c0300, c0700, and c0a00.
     

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    #6 bobbintb, Sep 11, 2024 at 6:34 PM
  7. Brian1954

    Brian1954 Active Member

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    What scan tool or app are you using?

    I do not think those three trouble codes are valid trouble codes for a Prius.
     
    #7 Brian1954, Sep 11, 2024 at 7:01 PM
  8. ChapmanF

    ChapmanF Senior Member

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    Yes, what app is that? There seem to be several things bogus in that screenshot:

    • all the codes it is showing are C codes, but it describes them all as "Engine and Transmission", which is for P codes.
    • it shows the same fortune cookie "Fuel Volume Regulator Control Circuit High" for three different codes
    • that fortune cookie actually goes with the P0004 code
    • a Prius v doesn't have a fuel volume regulator control circuit
    • and if it had one, any codes about it would be P codes
    • none of C0300, C0700, or C0A00 is a familiar Prius code

    Whatever app that is, it probably doesn't belong very high on the recommended list.

    If the brake, ABS, and skid lights are on, those codes can be retrieved this way (with no depending on a possibly wacky app):

    Blink (a/k/a Flash) Codes – How to. | PriusChat
     
    #8 ChapmanF, Sep 11, 2024 at 10:36 PM
    Last edited: Sep 11, 2024 at 10:41 PM
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