2008 85k miles code P0A09 dc converter status low input

Discussion in 'Gen 2 Prius Technical Discussion' started by Shabir21, Aug 16, 2025.

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  1. Shabir21

    Shabir21 New Member

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    This forum is my last chance before i send it to the shop.

    P0A09 dc converter status circuit low input
    C1310 HV system malfunction
    Red triangle is on and wont go away even when i clear the codes
    Runs and drives fine, hybrid battery is charging like usual

    I replaced the inverter, checked inverter pump, put another 12V battery from another prius that i have, checked every module/cell in hybrid pack under load.

    What can be the issue?
    TIA
     
    #1 Shabir21, Aug 16, 2025
  2. Shabir21

    Shabir21 New Member

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    *** I saw other threads about NODD and VLO but have no idea where they located at or how to test them***
     
    #2 Shabir21, Aug 16, 2025
  3. bisco

    bisco cookie crumbler

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    #3 bisco, Aug 16, 2025
  4. Shabir21

    Shabir21 New Member

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    #4 Shabir21, Aug 16, 2025
  5. mr_guy_mann

    mr_guy_mann Senior Member

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    That code involves one of two signal circuits between the hybrid control ecu and the controller inside the inverter assembly.

    Having a capable scantool that can retrieve "freezeframe data" would be useful. That is a snapshot of data that the ecu stores when it sets certain codes. There you would find the INF (detail) code that gives more info about the fault.

    I can't give all the details in a short post, but "checking the wiring" involves:

    Inspecting the harnesses between the inverter and ecu for visible damage.

    Removing the HV safety fuse.

    Unplugging the correct connectors at the inverter and ecu - then inspect for "damaged, loose, or backed out" terminals.

    Checking for near 0 ohms resistance through a given circuit. (from the inverter to the ecu)

    Checking that there is no continuity between either circuit and ground.

    Checking that there is no continuity between either circuit and 12V power.

    The idea is to check the wiring, and if that is not the problem, then replace the inverter assembly.

    Posted via the PriusChat mobile app.
     
    #5 mr_guy_mann, Aug 18, 2025 at 12:49 PM
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