New Hybrid Battery gone bad?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Ellen Griffiths, Aug 7, 2018.

  1. Ellen Griffiths

    Ellen Griffiths New Member

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    11 months ago I replaced the hybrid battery with a brand new one from
    Toyota. Worked great until the last 2 months, I watch the battery gauge
    fluctuate drastically - 8 bars down to 3; turn car off at 7 bars, turn back on
    and it's 2 bars. 2 dealers have said there is nothing wrong with the hybrid,
    no codes are showing. Then the 12v died last week and I replaced that. Are
    the two connected somehow? With only 3 weeks left on the hybrid warranty,
    can you tell me if the battery activity is normal or is there something wrong
    with the new hybrid they installed?
     
  2. PriusCamper

    PriusCamper Senior Member

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    You need data to show them... If you do a load test on all 28 modules you'll be able to identify the one that's causing the problem. All you need is a timer, a multi-tester and the headlamp bulb. Here's how to do it: Prolong® Battery Module Load Tester User Guide – Hybrid Automotive You can also use the resistance and voltage readings via the Torque app via OBD2 Bluetooth reader.

    For them to say the car has to throw codes to do a warranty is BS. If you spend $2000 on a part that is showing signs of being defective and they refuse, go direct to Toyota customer service and keep escalating to manager, supervisor, etc until you get results. At the very least you need to document all the signs of early failure, so when it does throw a code you can prove the problem started before the one-year warranty expired.
     
  3. Ellen Griffiths

    Ellen Griffiths New Member

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    Thank you very much - I feel like I'm going crazy so it's nice to know there may be a problem - I'm calling Toyota today!
     
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  4. priusb78

    priusb78 Member

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    I would try to find someone, e.g. a dealer or someone else, who has the TechStream diagnosis software from Toyota and is able and willing to check the HV-battery ideally under heavy load, e.g. in EV-mode driving. Differences in voltage between modules can then be identified easily.
     
  5. bisco

    bisco cookie crumbler

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    who installed it? dealer installation includes 3 year warranty.

    of course, anything is possible, but extremely unlikely. how is it behaving with the new 12v, and did you charge the 12v before installing?

    the hybrid battery charges the 12v, but not while the car is off. it should not be dropping 5 bars overnight.
    that said, how are your mpg's?
     
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  6. ericbecky

    ericbecky Hybrid Battery Hero

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    The likelihood of a NEW battery failing within a year is very, very small.
     
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  7. JC91006

    JC91006 Senior Member

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    If 2 dealers have checked your car and determined the HV battery to be in good health, then you probably don't have any problems.

    If it's really hot out and you're blasting the AC, your car's battery State of Charge will go down much faster than normal. That does not mean there's something wrong with the car, just that it's hot and it's using up energy faster
     
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  8. priusb78

    priusb78 Member

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    I read the starting post again:
    Turning off the car with a "normal" State-of-charge" (SOC), e.g. 5-6 bars, and startting it again next day with only 2-3 is quite normal if you have used EV-mode or AC before turning the car off. SOC is a calculated value and sometimes the calculation is too slow to show the real charge level in time. In this case I would not worry at all.
     
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