p0a80 - code on Prius

stewstew Member Posts: 1
edited March 2019 in Toyota
what does it mean?


  • thecardoc3thecardoc3 Member Posts: 5,690
    edited March 2019
    P0A80, Replace Battery Pack.

    What it means is the state of charge of the battery cells isn't balanced. The system will allow up to a 20% imbalance, once that is exceeded that indicates that one of more cells are failing. The first data that I would be looking at first would be the ID numbers of the highest and lowest cells and the delta SOC (state of charge). Then I would be looking at the SOC of each cell, the resistance of each cell and then do a load test on the battery assembly.

    With that information I could then decide if replacing individual cells is a viable option or if in fact the best fix is to replace the whole pack.

    Under what conditions is this code setting?
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