P0AC2 - voltage too high?

Discussion in 'Gen 2 Prius Technical Discussion' started by Jimlarge, Apr 20, 2019.

  1. Jimlarge

    Jimlarge Junior Member

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    Getting code P0AC2, red triangle, VSC, and some abs codes.

    Some tell me I need a new HV battery. I tried using torque as pictured to see if I could narrow down which blocks are bad but all seem to be very similar.

    Anyone had this issue/code before or any input as to what I should try next.

    I really appreciate any help!
    Have a good Easter.

    Jim Screenshot_20190420-145601.jpeg

    Posted via the PriusChat mobile app.
     
  2. SFO

    SFO Senior Member

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    How many miles on the vehicle?

    Has the HV battery ever been touched before?

    Is that the only code Torque is reporting?
     
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  3. TMR-JWAP

    TMR-JWAP Senior Member

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    P0AC2 has nothing to do with module blocks. This code is : Hybrid Battery Pack Current Sensor Circuit High

    Potential Causes:
    HV battery assembly (wiring harness or connector)
    Battery current sensor
    Battery ECU

    As asked previously, has this battery been worked on recently or is it virgin?

    I would venture either the plug has backed out of the current sensor (located in the battery pack), the current sensor is going bad, or the ecu is having some issues. Clear up this issue and the other fault lights will go away.
     
  4. Jimlarge

    Jimlarge Junior Member

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    It's the original battery. It is the only code other than VSC and Abs lights

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  5. Jimlarge

    Jimlarge Junior Member

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    Virgin battery, 192k miles

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  6. 06PriusDaily

    06PriusDaily New Member

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    Did you find a solution for this? I have a 2006 Prius with a HV Battery pack that was just purchased from a Toyota store.

    I installed the HV battery and the following codes came back:

    P3000
    P0AC2
    C1259
    C1310

    Any ideas where to start
     
  7. SFO

    SFO Senior Member

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    Recheck all of the connections made during the installation, pay attention to the 'current sensor' and check for ECU corrosion as well.

    Here on page 66 of 165 (or HB 66) is the workup for DTC P0AC2 (P0AC0 P0AC1 P0ABF): https://attachments.priuschat.com/attachment-files/2020/03/183963_Hybrid_Battery.pdf

    You may want to consider a 'mini-vci' cable and a copy of techstream, this is the same software the dealer technicians use to test/diagnose/repair vehicles with.

    Some DTCs have associated INFs (AKA secondary codes, subcodes, detail codes), knowing the subcode for a particular DTC may help diagnose the issue, potentially saving time and money. DTC P3000 has five (5) related INFs (subcodes).

    Here is the workup for DTC P3000 with INFs 123, 125, 603 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21bpm/3000123.pdf

    Here is the workup for DTC P3000 with INF 388 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21bpm/3000388.pdf

    Here is the workup for DTC P3000 with INF 389 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21bpm/3000389.pdf

    [​IMG]
     
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