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HELP: CEL P0A80 for 18+ months!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by MJ50, Aug 18, 2019.

  1. MJ50

    MJ50 Junior Member

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    i've had P0A80 come on for last 18 months.
    when CEL came on, it never went to limp mode.
    checked block voltages with torque app every time and all were normal.

    last week, opened battery pack and measured each cell.
    7.87
    7.85
    7.84
    7.83
    7.83
    7.82
    7.82
    7.79
    7.80
    7.80
    7.81
    7.81
    7.81
    7.80
    7.81
    7.80
    7.81
    7.81
    7.81
    7.81
    7.81
    7.81
    7.82
    7.81
    7.82
    7.83
    7.85
    7.86

    outer cells are balanced and inner cells are balanced.
    is it possibly throwing code because gap between the two are high?
    if so, do i need to replace entire pack??
     
    #1 MJ50, Aug 18, 2019
  2. Raytheeagle

    Raytheeagle Senior Member

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    The code can come on for multiple reasons ;).

    Getting a subcode will help with the next steps (y).
     
    #2 Raytheeagle, Aug 18, 2019
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  3. MJ50

    MJ50 Junior Member

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    it didn't throw any other code for last 18 months... :(
     
    #3 MJ50, Aug 18, 2019
  4. tankyuong

    tankyuong Senior Member

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    I would say you should balance them all close to same voltage
     
    #4 tankyuong, Aug 18, 2019
  5. Raytheeagle

    Raytheeagle Senior Member

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    And you’re reading the codes with Techstream?
     
    #5 Raytheeagle, Aug 18, 2019
  6. MJ50

    MJ50 Junior Member

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    techstream and torque
     
    #6 MJ50, Aug 18, 2019
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  7. MJ50

    MJ50 Junior Member

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    that won't be easy diy... :(
     
    #7 MJ50, Aug 18, 2019
  8. Raytheeagle

    Raytheeagle Senior Member

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    So no snowflake icon was present for further data?
     
    #8 Raytheeagle, Aug 18, 2019
  9. MJ50

    MJ50 Junior Member

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    the blue icon in front of P0A80?
    HybridControlLive.jpg
     
    #9 MJ50, Aug 18, 2019
  10. Raytheeagle

    Raytheeagle Senior Member

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    Yes;).

    Click on that and an INF code will be available(y).
     
    #10 Raytheeagle, Aug 18, 2019
  11. MJ50

    MJ50 Junior Member

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    oh, didn't know that...
    will try it in few days when CEL comes on again... :D
     
    #11 MJ50, Aug 18, 2019
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  12. MJ50

    MJ50 Junior Member

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    HVvolt.jpg

    looks like i need to replace cells in block #4 and #5?
     
    #12 MJ50, Aug 20, 2019
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  13. Raytheeagle

    Raytheeagle Senior Member

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    That’s where I’d start;).

    But your whole pack isn’t looking that great:cool:.

    Measure all of the modules voltages and see where each one is at. In blocks 4 and 5 one cell is out in 2 of the 4 modules that compose those blocks.

    If you do this yourself, you’ll want to balance the modules, otherwise the repair you do will be something you’ll get very familiar with:(.

    The longer you drive without dealing with the problem the system is telling you about, the worse the other cells get as they are “making up” for the bad ones.

    Good luck and keep us posted (y).
     
    #13 Raytheeagle, Aug 20, 2019
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  14. ericbecky

    ericbecky Hybrid Battery Hero

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    Some ideas...
    Use the torque app to record the cell block data while driving.

    Then export that csv data file to Google sheets and make a graph.

    Or use Techstream to record the values and make a graph. This may help you see what is going live.

    Carefully inspect all wiring connections, including ring terminals. Especially the ones hidden underneath other connections.

    Inspect for corrosion on the orange connector that goes into the computer in the hybrid battery, as well as pins on that computer.

    You could also spend time load testing all the modules and then rebalancing the pack afterwards
     
    #14 ericbecky, Aug 20, 2019
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  15. MJ50

    MJ50 Junior Member

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    update. replaced battery pack and no more CEL.
     
    #15 MJ50, Sep 6, 2019
  16. Peter123

    Peter123 Active Member

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    Where did you get the battery pack? Is it new cells or a rebuild?
     
    #16 Peter123, Sep 6, 2019
  17. MJ50

    MJ50 Junior Member

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    ace hybrid. it's rebuild but comes with 2yr warranty...
     
    #17 MJ50, Sep 6, 2019
  18. bisco

    bisco cookie crumbler

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    congrats, all the best!(y)
     
    #18 bisco, Sep 6, 2019
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