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04 Prius:replace hybrid battery

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by ryanross, Oct 15, 2022.

  1. ryanross

    ryanross New Member

    Joined:
    Oct 15, 2022
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    Location:
    Green Bay, WI
    Vehicle:
    2004 Prius
    Model:
    N/A
    I have an 04 Prius 402,000 miles. The hybrid battery light came on and the triangle so I took the battery out and tested all the cells 2 of them were lower voltage then the rest. So I replaced the 2 lower voltage ones and put it back together and scanned all codes out. (Snap on scanner) After driving it 5 minutes the same lights came on saying replace the hybrid battery?? Any insight would help Ryan Green Bay Wisconsin
     
    #1 ryanross, Oct 15, 2022
  2. bisco

    bisco cookie crumbler

    Joined:
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    welcome!

    i've never heard of a battery light. it's always a good idea to scan for codes with a prius aware scanner like tech stream.
    when you replace modules, you have t get really lucky. ordinarily, you must balance the pack in order to get some reliability out of it.
    it also depends on how old the other modules are.
     
    #2 bisco, Oct 15, 2022
  3. ryanross

    ryanross New Member

    Joined:
    Oct 15, 2022
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    Location:
    Green Bay, WI
    Vehicle:
    2004 Prius
    Model:
    N/A
    Sorry not the battery light but yes: the triangle, CE light and abs light come on together. Then the cooling fan turns on for the hybrid battery. When I reinstalled them I had the same voltages one next to each other. The 25 good ones I left in the same positions. ??? I’m going to research some more. I’d like to get to 500,000 and beyond
     
    #3 ryanross, Oct 15, 2022
    SFO likes this.
  4. SFO

    SFO Senior Member

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    Location:
    Northern California
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    2007 Prius
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    What were the OBD2 codes (DTCs) that you found when using the above scanner?

    FYI : you're moderated until you've posted 5 times.
     
    #4 SFO, Oct 16, 2022
  5. ryanross

    ryanross New Member

    Joined:
    Oct 15, 2022
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    Location:
    Green Bay, WI
    Vehicle:
    2004 Prius
    Model:
    N/A
    I watched so more YouTube videos regarding changing cells. I made a quick voltage balancer and took all the batteries that were equal and they tested at 7.7. I put it all back together and I have 26 miles on it so far. Cross my fingers. Thanks for responses !
     
    #5 ryanross, Oct 16, 2022
    bisco likes this.
  6. ryanross

    ryanross New Member

    Joined:
    Oct 15, 2022
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    Location:
    Green Bay, WI
    Vehicle:
    2004 Prius
    Model:
    N/A
    I spoke to soon after 30 miles the lights came on
    Code reader says
    p0a80 replace hybrid battery pack
    P3014 CNF DTc Definition not found

    UGH. I was excited for good travels and now I’m running out of ideas? Any thoughts ?
     
    #6 ryanross, Oct 17, 2022
  7. nancytheprius

    nancytheprius Active Member

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    Location:
    iowa
    Vehicle:
    2006 Prius
    Model:
    II
    whats the history on the battery? is it original or have you been swapping cells for awhile?
     
    #7 nancytheprius, Oct 17, 2022
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