Hybrid battery. I tested all modules, they are good, but keeps discharging.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Luis Lednick, Aug 7, 2021.

  1. Luis Lednick

    Luis Lednick New Member

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    Hi everyone,
    I'm new here. Nice to e-meet everyone.

    Question: I disassembled the battery pack and tested every cell ( see pic ), but still keeps discharging.
    The scanner gives me the code ( see pic ).

    So, when I unplug the 12V battery for 2min and plug it back in, the message goes away and seems to charge the battery from 2 bars to full in about 5 minutes.

    ** From the forums I've ready, I was expecting to see a bad battery, like with 5V that had to be replaced.

    Any thoughts? Thank you,
     

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    #1 Luis Lednick, Aug 7, 2021
  2. PriusCamper

    PriusCamper Senior Member

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    Next step is to measure how much voltage drops when you attach a 12v 50w bulb (can use car's headlight bulb if its halogen) to a module for 2 minutes.... The bad modules will lose much more voltage than the good ones.
     
    #2 PriusCamper, Aug 7, 2021
  3. JC91006

    JC91006 Senior Member

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    Prius has a 10 year / 150k miles warranty. If your car is a 2014 and under 150k miles, you are still under Toyota warranty.

    If you take those voltage measurements after letting the battery sit for 1 week, the weaker modules will measure much lower. As it looks now, the battery pack is not very balanced and you may have a weak/failed module in there. Measurements taken after 1 week usually can identify the bad ones.
     
    #3 JC91006, Aug 7, 2021
    SFO likes this.
  4. douglasjre

    douglasjre Senior Member

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    Techstream?
     
    #4 douglasjre, Aug 8, 2021
  5. Grit

    Grit Senior Member

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    o_O
     
    #5 Grit, Aug 8, 2021
  6. Tekken

    Tekken Member

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    Only if the vehicle originally from Cali, New York state
     
    #6 Tekken, Aug 8, 2021
  7. douglasjre

    douglasjre Senior Member

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    How about if it became registered in California now
     
    #7 douglasjre, Aug 8, 2021
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  8. Tekken

    Tekken Member

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    No, my 2013, 1st owner originally from Kansas city. and it has been Cali registered since 2018. Last ECU soft upgrade, the manager pull out the policy on this vechile doesn't apply as 150,000 miles or 10yrs Hydrid battery warranty
     
    #8 Tekken, Aug 8, 2021
  9. FrankB

    FrankB Member

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    Also check that no cells are shorted to the chassis. Measure the voltage from each cell to the chassis, they should all be 0 when the bus bars are removed.
     
    #9 FrankB, Aug 9, 2021
  10. bisco

    bisco cookie crumbler

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    welcome!

    corrosion
     
    #10 bisco, Aug 9, 2021
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