Hybrid Battery Pack Deterioration P0A7F

Discussion in 'Gen 3 Prius Main Forum' started by Parvaiz Iqbal, Oct 17, 2019.

  1. Parvaiz Iqbal

    Parvaiz Iqbal New Member

    Joined:
    Aug 28, 2019
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    Location:
    Bradford UK
    Vehicle:
    2009 Prius
    Model:
    N/A
    My check engine and red triangle light came on. I checked the code and it's a battery issue.
    The code is P0A7F (Hybrid Battery Pack Deterioration)
    Open the HV Battery bus bars had erosion clean them, battery had dust clean that, clean the FAN and all parts.
    check the battery Cells looks okay, all had good voltage 3 were between 7.73 and 7.8
    rest all were above 7.8.
    Fit the battery back and P0A7F comes back in 20 miles.

    some time car engine stays on constantly and Hybrid system behave strange no charging shown on dash and battery bars go up and down.
    Some time works fine battery charge, engine goes off and stays off for long

    my feeling is HV battery ECU
    Temp sensors values are quit high compare to cold weather outside 10 Degree Celsius.
    it shown above 30 at that time.

    Has anyone else experienced this problem? what will be the solution.
    Attached Freez Frame and live data PDF Files
    for any solution, advise and suggestion Thanks is advance.
    Had Tech Stream how to find this issue with that

    I have about 117,000 miles on the car.
     

    Attached Files:

  2. Dxta

    Dxta Senior Member

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    I think the code already tells you everything. Your pack had deteriorated.
     
    dubit and bisco like this.
  3. Parvaiz Iqbal

    Parvaiz Iqbal New Member

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    so its mean change the whole battery, Even the cell voltage is good
     
  4. bisco

    bisco cookie crumbler

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    how many miles on her?

    what are you reading the codes with?

    are you load testing the cells?
     
  5. Parvaiz Iqbal

    Parvaiz Iqbal New Member

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    2009 Prius
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    hi thanks for reply,
    117 000
    Year 2010 Prius Gen 3
    Tech stream Mini VCI
    yes they don't drop Voltage even when engine stop charging, all lights were on but voltage stays same on all modules above 15.5 V for 2 minus.
     
  6. Dxta

    Dxta Senior Member

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    You said YES! How are you load testing them?
     
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