Red Triangle, Check engin, VSC On. Codes HELP! Pics

Discussion in 'Gen 2 Prius Technical Discussion' started by CollegeKid, Oct 30, 2017.

  1. CollegeKid

    CollegeKid New Member

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    So I've had code P1121 on for about 3 months and never changed it cause i read it was no big deal. I dont know if this is related to my problems, but turned on the car today and red triangle, engine light, and vsc light, and touch screen says problem. I checked the code reader and it pulled up P1121 and P1116, I think it's for the same coolant control valve. I replaced it and put new cooling fluid, all Toyota recommended parts and fluid hoping this would remove everything. I cleared the code and left running for a 10 minutes and turned back on, but can't pull any codes off. I don't know the problem and don't want to drive with the triangle on. Any advice or help? I Left pics for reference.
     

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  2. CollegeKid

    CollegeKid New Member

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    The small battery that starts the car isn't the problem either, i replaced that this year. I think the other pump is working too cause when i look inside the filling reservoir, the water vibrates. Also want to mention that the hybrid battery fan in the car is now running. I have never herd it do that before tll everything happened.
     
  3. dolj

    dolj Senior Member

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    I suspect your code reader cannot read all the Prius ECUs, specifically the ones to do with the HV battery. You may need to get or borrow a more capable reader, then the mystery will largely go away.
     
  4. CollegeKid

    CollegeKid New Member

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    Ya it’s a cheap $30 one.
    Another thing I want to add is that the hybrid battery fan is running now. I’ve never herd it on before
     
  5. bisco

    bisco cookie crumbler

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    mini vci and compatible laptop. fan sound is a clue to a bad battery. is the grille open and fan clean?
     
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  6. CollegeKid

    CollegeKid New Member

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    update:
    so got a different code reader and got some codes
    P0A80 and P3015

    Both signs to bad battery right?
     
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  7. bisco

    bisco cookie crumbler

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    i know the first one is.
     
  8. dolj

    dolj Senior Member

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    Yup.
     
  9. fotomoto

    fotomoto Senior Member

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    Yes.

    Is the an original california (CARB) car? If so, you might still have some warranty left (10yr/150k miles) or at least get a "good will" replacement.
     
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