2006 Prius fault P0A93

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Ben Weeks, Dec 23, 2015.

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  1. Ben Weeks

    Ben Weeks New Member

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    My Prius just threw this fault and the whole dashboard lit up like a Christmas tree. The Triangle of death appeared. The next day all faults cleared from the dashboard. What does this mean?
     
    #1 Ben Weeks, Dec 23, 2015
  2. bisco

    bisco cookie crumbler

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    welcome! could be a bad 12 volt, or the beginning of inverter cooling pump death. how many miles on her? if you take the cover off the pump reservoir with the car 'ready', is there movement of the fluid?
     
    #2 bisco, Dec 23, 2015
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  3. Ben Weeks

    Ben Weeks New Member

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    Thanks for answering. She has 137,000 miles.

    Yes, not like the ocean but definitely see movement

    The inverter pump was replaced by the dealer in 2011 as a recall item.
     
    #3 Ben Weeks, Dec 23, 2015
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  4. bisco

    bisco cookie crumbler

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    could be bad, who knows? check the reservoir. how old is your 12 volt?
     
    #4 bisco, Dec 23, 2015
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  5. Ben Weeks

    Ben Weeks New Member

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    Replaced last year by dealer. The car also threw fault C1241

    Does fault P0A93 cause fault C1241 - are they related
     
    #5 Ben Weeks, Dec 23, 2015
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  6. bisco

    bisco cookie crumbler

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    what are you using to read the codes?
     
    #6 bisco, Dec 23, 2015
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  7. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Yes. DTC C1241 is reported by the skid control ECU and means that the voltage on the 12V bus is low.
    DTC P0A93 is logged by the hybrid vehicle ECU and means that the inverter coolant pump is not doing its job. When the inverter overheats, the DC/DC converter will shut down which causes voltage on the 12V bus to sag.

    The coolant pump may be getting intermittent, I suggest you have it replaced soon even if you see fluid turbulence since the car is logging those fault codes.
     
    #7 Patrick Wong, Dec 23, 2015
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  8. Ben Weeks

    Ben Weeks New Member

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    Thank you for the great technical discussion. I'll get her to the shop soon.
     
    #8 Ben Weeks, Jan 9, 2016
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