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VSC ABS (!) lights on after replacing inverter coolant pump

Discussion in 'Gen 2 Prius Main Forum' started by marhuu, Oct 17, 2024.

  1. marhuu

    marhuu Junior Member

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    So here is the story. Red triangle, engine lights with a bunch of orange lights eg VSC abs. Scanned code P0a93 indicating inverter coolant pump problem. Replaced the pump, drained all coolant and added new. Bleeding system until solid coolant came out of the bleeding valve.
    Started the car fine with all warning lights off. However after driving for 1 min, VSC ABS and (!) lights on. Every time when starting the car, all warning lights off but came back on after short drive.
    Suspect the 12v battery problem, so replaced it. However those three lights still came back on after short driving. Btw the red brake light is always off.
    Scanned no code found.
    any ideas?
     
    #1 marhuu, Oct 17, 2024
  2. bisco

    bisco cookie crumbler

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    what scanner? it may be inadequate
     
    #2 bisco, Oct 17, 2024
  3. Brian1954

    Brian1954 Senior Member

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    If you have the warning lights on and then scanned and found no trouble codes, it means that the scan tool that you are using is not good enough to scan all the dozen or more different systems in your Prius. You need a better scan tool. Read this thread:
    https://priuschat.com/index.php?posts/3246758
     
    #3 Brian1954, Oct 17, 2024
  4. ChapmanF

    ChapmanF Senior Member

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    #4 ChapmanF, Oct 17, 2024
  5. Has Raf

    Has Raf Junior Member

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    I had this with a naff scanner, with the same VCS ABS etc.codes. I bought the Autel MaxiAP 200 and all the error codes came through on it. Buy that one. It’s great for a gen 2, and cheap.
     
    #5 Has Raf, Oct 18, 2024
  6. ChapmanF

    ChapmanF Senior Member

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    Blink codes are even cheaper. :)

    But a good scan tool can get codes from all the computers in the car, even the ones that don't do blink codes. (y)
     
    #6 ChapmanF, Oct 18, 2024
  7. marhuu

    marhuu Junior Member

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    Update:

    this morning I powered on the car. As expected no lights came on. I started to drive and expected those 3 lights came back. Surprisingly no lights on whatsoever. Now it is evening I drove about 60 miles today. Still no lights came back on.

    I did nothing. Issue resolved by itself.
     
    #7 marhuu, Oct 18, 2024
  8. dolj

    dolj Senior Member

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    ... for now.;)
     
    #8 dolj, Oct 18, 2024
  9. Has Raf

    Has Raf Junior Member

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    Maybe dirty ABS sensor? I’d get a code reader anyway. It’s very handy.
     
    #9 Has Raf, Oct 19, 2024
  10. marhuu

    marhuu Junior Member

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    Update:
    I got Techstream working and found these codes

    -U0123 "Lost communication with yaw rate sensor module"
    -U0124 "Lost communication with lateral acceleration sensor module"
    -U0126 "Lost communication with steering angle sensor module"

    I have been driving 500 miles from last time all lights off. No lights is on the dashboard but Techstream still pick up the above 3 codes. Should I just erase them?
     
    #10 marhuu, Oct 26, 2024
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