2009 Prius Hybrid battery dead?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Daniel D, Jun 26, 2018.

  1. Daniel D

    Daniel D New Member

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    My 2009 has a little over 100K miles and was getting the dreaded red triangle of death. Replaced the 12 V battery and the problem persisted. I can start the car but as soon as I put it in drive and hit the gas, nothing! And the triangle. So I was getting prepared to spend $1500 for hybrid replacement when I watched a bunch of videos and thought "why not" for taking out the hybrid battery and checking the cells. I successfully removed the battery "wasn't really that hard" and was hoping to find a bad cell and replace it and be done. Nope! All my cells read 7.46V. And that's with the orange connector off. Now those little metal connectors had some pretty bad corrosion on them and I'm letting them sit in vinegar for a while. If my cells are all good then what could be the issue? Could it be just the corrosion on the connectors?
     
  2. bisco

    bisco cookie crumbler

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    welcome!
    corrosion can be the issue. if not, you need to load test the cells. are you in a carb state?
     
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    Daniel,

    At this point, my only recommendation would be to not jump to conclusions. There's no mention in your first post about whether you had codes read to determine the actual diagnostic trouble code. It may be in your best interest to find out what the car is telling you before you start swapping parts. More than just the battery could be causing your problem
     
    Raytheeagle and ITBland like this.
  4. ITBland

    ITBland Active Member

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    Or, get the error codes read and see what the warning lights really mean.
    Edit: Beat me to it!
     
  5. ericbecky

    ericbecky Hybrid Battery Hero

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    Spend ~$75 to buy diagnostic equipment
    - Android phone/tablet (~$50)
    - Elm 327 Blutooth OBDII adaptor (~$20)
    - Torque Pro app (~$5)

    Then you can see the cell data live as well as many other bits of information.
    Plus you can read and clear codes.

    Where are you located?
     
  6. JC91006

    JC91006 Senior Member

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    Have you checked all your fluid levels? Low oil can give you a triangle and won't do much when you step on the gas

    7.4v is pretty low for a running car, I would think it would read 7.6v and above....unless it's been sitting for a while
     
    #6 JC91006, Jun 26, 2018
    Last edited: Jun 26, 2018
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