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P0A80 and P3021

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Cduke3173, Jul 3, 2019.

  1. Cduke3173

    Cduke3173 Junior Member

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    Ok I am new to this so please bear with me. I have a 2005 Gen 2 Prius 300K miles for about a year now I have been Getting the P0A80 code without any real issues but in the last month I have been getting P3021 (Low volts on pack 11). My question is if I have had a bad HV pack for the last year by getting code P0A80 why did it not tell me which pack is bad?

    Thank You for your help.
     
    #1 Cduke3173, Jul 3, 2019
  2. bisco

    bisco cookie crumbler

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    perhaps as the packs go out of parameters, the first code hits at a certain point in the process, and as it degrades further, the next code hits
     
    #2 bisco, Jul 3, 2019
  3. Cduke3173

    Cduke3173 Junior Member

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    Here is a screen shot of my volts as I can see my only issue is block 11
     

    Attached Files:

    #3 Cduke3173, Jul 3, 2019
  4. bisco

    bisco cookie crumbler

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    makes complete sense now
     
    #4 bisco, Jul 3, 2019
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  5. Cduke3173

    Cduke3173 Junior Member

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    From what I can tell my only issues is the Block 11
     
    #5 Cduke3173, Jul 3, 2019
  6. bisco

    bisco cookie crumbler

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    that's what it looks like, was that test under load?
     
    #6 bisco, Jul 3, 2019
  7. Cduke3173

    Cduke3173 Junior Member

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    Yes it was done while driving and A/C on Here is one at idle Screenshot_20190703-154350.png
     
    #7 Cduke3173, Jul 3, 2019
  8. Dxta

    Dxta Senior Member

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    You would only get a specific code, when one or all of the modules have gone beyond the internal resistance thresholds set by the by ECU.
    Y you were only getting the p0a80 was the modules were probably still a little bit in a better shape. If you had a code reader, you'd have seen that the p0a80 was appearing in the pending section of your code reader.
     
    #8 Dxta, Jul 3, 2019
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  9. Cduke3173

    Cduke3173 Junior Member

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    Thanks did not relize there was a differance if it was pending.
     
    #9 Cduke3173, Jul 3, 2019
  10. Cduke3173

    Cduke3173 Junior Member

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    So just ordered replacment cells .
     
    #10 Cduke3173, Jul 3, 2019
  11. bisco

    bisco cookie crumbler

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    don't forget the balancing (y)
     
    #11 bisco, Jul 3, 2019
  12. Cduke3173

    Cduke3173 Junior Member

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    And what is the best way to balance them ?
     
    #12 Cduke3173, Jul 3, 2019
  13. bisco

    bisco cookie crumbler

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    read the balancing threads, i've never done it. there are methods for matching cells, and charge/discharge cycles. the more particular you are, the longer it will last before the next out of balance event. although, some like to just throw in the cells and take their chances. a few have gotten lucky.
     
    #13 bisco, Jul 3, 2019
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  14. Nutsforprius

    Nutsforprius New Member

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    My 2007 just started with P0A80 and P3021 codes. I swapped hybrid pack with one from another car that wasn't throwing codes. Now the first car is throwing same codes with different pack and the second car is not. I have a new battery on the way. But any.ideas why one car does it but not the car
     
    #14 Nutsforprius, Jun 12, 2022
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