ABS, VCS and parking brake warning lights all on while driving

Discussion in 'Gen 2 Prius Main Forum' started by james909, Mar 25, 2025.

  1. james909

    james909 Junior Member

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    Hi and thanks in advance for your help. I had a brake leak fixed a few weeks ago. Near the beginning of a 3 mile journey just now my vcs, abs and hand brake warning lights all came on. Brakes continued to work and regen appeared to be working. When I stopped I pumped the brakes a few times, restarted the car and the lights went out. Every other hard brake press pump runs for 4 seconds. Brake fluid level fine. Electric noise coming from under the hood somewhere but not the same sound as abs pump running. I have been running in b mode a lot and barely using the friction brakes if that is important. Checked inverter coolant and it had movement. Any ideas greatly appreciated.
     
    #1 james909, Mar 25, 2025
    Last edited: Mar 25, 2025
  2. MAX2

    MAX2 Senior Member

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    The idea is to run diagnostics, find out the error codes and report them in a message in this topic.
    Users will tell you which problem areas need to be checked.
     
  3. Tombukt2

    Tombukt2 Senior Member

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    Why would you run in B.? Prius is going to stop You just may have a little longer distance be like an old truck '60s type of thing anyway yeah now you need to get the codes you got all the lights on probably the break actuator's going out but there's no guarantee of that because you just had a leak maybe returned . So you really need the codes with the capable scanner so you can find out whether they're talking about fresher fluid being low or a myriad of other things It's just the way to do it We can all sit here and shoot guesses all day and your car is going to be sitting out there with no brakes
     
  4. james909

    james909 Junior Member

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    Just finished work so will try to get blink codes and test 12v with multimeter.
     
  5. james909

    james909 Junior Member

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    Battery reads 12.2v after a 3 mile run

    The codes are

    VSC 45
    ABS 42
    ((!)) 57, 49
     
    #5 james909, Mar 25, 2025
    Last edited: Mar 25, 2025
  6. Tombukt2

    Tombukt2 Senior Member

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    Spliced what cable I'm assuming power cables I guess it's possible the splice is coming undone or frayed pieces of wiring or touching not twisted well something.
     
  7. james909

    james909 Junior Member

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    I mean when he fixed the brake line he cut the end off and spliced a new piece on.
     
    #7 james909, Mar 25, 2025
    Last edited: Mar 26, 2025
  8. Tombukt2

    Tombukt2 Senior Member

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    Cable would be for the parking brake so that should have no effect on normal breaking except when you're parking the car and you push that click pedal down. I wouldn't think that even being not connected shouldn't cause you any codes or strife and breaking It just means you don't have the friction parking brake You still have the park lock from the internally in the transmission from your push button for park but you don't have a parking brake I don't see where that would affect anything at all code-wise or drivability and braking wise.
     
  9. james909

    james909 Junior Member

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    I think I've confused the thread.

    The warning lights have all gone out.

    No sign of a brake fluid leak.

    These codes have been logged

    Can anyone interpret them.

    VSC 45
    ABS 42
    ((!)) 57, 49

    Actuator seems to be pumping for about 4 secs every other brake press.

    I have been driving around in b and braking really lightly if at all for a couple of weeks. I was worried about the brakes and read someone kept a dying actuator going doing this. Now I'm wondering if my lack of hard presses caused the accumulator pressure to run low.
     
    #9 james909, Mar 25, 2025
    Last edited: Mar 25, 2025
  10. Tombukt2

    Tombukt2 Senior Member

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    If you have no lights get it out of b and drive like a normal sane person for the most part not breakneck or any of that but you know and you should be good when there's going to be a problem you will get a loud beep that will not go away The four seconds every other pump you're talking about seems adequate fine whatever not an issue at all most of them actually probably pump a little more than that but no matter I think you're in good shape No I don't know those car codes that come on the screen by heart I have to hook up my scanner to get that mess I don't do blink codes either that was 20 years ago or maybe 30 now but anyway you should just be able to Google those codes you get off your MFD I just don't know them personally and I don't know that they're still active or whatever I think you said they were stored or whatever that means with a real scanner when you get it hooked up you're going to wind up erasing them probably so everything can be zeroed out and back to normal maybe you should look into an AP200 it seems like you're doing a lot of stuff to your car 63 bucks would be a real inexpensive tool that does a lot bleed your own brakes etc No it isn't that hard and it only takes one wrench
     
  11. Brian1954

    Brian1954 Senior Member

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    Paging @ChapmanF for the trouble codes associated with the blink codes in post #9.
     
  12. Tombukt2

    Tombukt2 Senior Member

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    They're posted in every post almost of this except this latest one Just go back two or three posts of Gen 3 ABS actuator part replacement and they should be there I just can't remember them It's too funny
     
  13. bisco

    bisco cookie crumbler

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  14. Tombukt2

    Tombukt2 Senior Member

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    You repaired a brake hydraulic line or replaced?
     
  15. james909

    james909 Junior Member

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    I had the last foot of brake line replaced to the rear wheel where it meets the flexi hose.

    I can try for codes with my Bluetooth elm327 and an app e.g. Dr Prius. Was reluctant as obd port connection is a bit loose and don't want to damage the pins
     
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  16. james909

    james909 Junior Member

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    I found this information in a list of codes I downloaded online.

    57 is accumulator low pressure
    49 open in stop light switch circuit - is stop light switch, switch control or bulb.

    DTC C1249 (Blink code 49) | Open in Stop Light Switch Circuit

    DESCRIPTION
    The skid control ECU inputs the stop light switch signal and detects the braking condition.

    The skid control ECU has a circuit for open detection inside. The skid control ECU outputs the DTC if it detects an open in the stop light signal input line when the stop light switch is off, or an open in the stop light circuit (GND side).
     
    #16 james909, Mar 26, 2025
    Last edited: Mar 26, 2025
  17. james909

    james909 Junior Member

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    Just checked the car. It's 7.00am here. 11.92v with multimeter on the battery. No brake fluid loss and no warning lights. Will take the car for a proper drive in an hour or so.
     
  18. Tombukt2

    Tombukt2 Senior Member

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    No pins they're in the Elm use car scanner w Elm
     
  19. Tombukt2

    Tombukt2 Senior Member

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    11.9 on AGM is low . Just saying . 12 2 to about 12.7 AGM
     
  20. james909

    james909 Junior Member

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    Yeah I agree on the battery. 5 mile drive and everything seems ok and no warning lights. My theory is the brake pedal switch may have siezed as I have been pressing the brakes so lightly. Perhaps it got stuck in a tiny bit. Now I'm back to d mode and using moderate to firm pressure on the pedal.