P0AA6 : 612 - Found Leaking Battery Modules

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by BlueOfLA, Oct 8, 2018.

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  1. BlueOfLA

    BlueOfLA Junior Member

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    Hi PC,

    I had a P0AA6 : 613 so I replaced the Transaxle and it was immediately followed up with a P0AA6 : 612

    So I've currently got the HV battery taken apart and found my 2 leaky Modules. (Module 1 and 28)


    Questions for the experts:
    -Why have the Modules leaked right where the temp sensors attach?
    •Is this something that is preventable in the future?
    -Since the leak is so very small (smaller than a dime), can these modules be salvaged with some epoxy or glue and placed elsewhere in the pack? (The Techstream data shows these battery blocks are healthy in relation to the pack as a whole, see pics)


    -Blue
     

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    #1 BlueOfLA, Oct 8, 2018
  2. BlueOfLA

    BlueOfLA Junior Member

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    One more question.. assuming the modules are not repairable - I do have 2 spare modules which as a block have 0.023 Internal Resistance

    When removing Modules 1 and 28 how should I best pair the pack with the replacement modules (A1 & A2)? I'd like to place them at the end of the pack for easier access should they later be rejected.

    2, 3 | 4, 5 | 6, 7 | 8, 9 | 10, 11 | 12, 13 | 14, 15 | 16, 17 | 18, 19 | 20, 21 | 22, 23 | 24, 25 | 26, 27 | A1, A2
    2, 3 | 4, 5 | 6, 7 | 8, 9 | 10, 11 | 12, 13 | 14, 15 | 16, 17 | 18, 19 | 20, 21 | 22, 23 | 24, 25 | 26, A1 | 27, A2
    2, 27 | 3, 4 | 5, 6 | 7, 8 | 9, 10 | 11, 12 | 13, 14 | 15, 16 | 17, 18 | 19, 20 | 21, 22 | 23, 24 | 25, 26 | A1, A2
    2, 27 | 3, 4 | 5, 6 | 7, 8 | 9, 10 | 11, 12 | 13, 14 | 15, 16 | 17, 18 | 19, 20 | 21, 22 | 23, 24 | 25, A1 | 26, A2


    | = end of block
    , = module pair
     
    #2 BlueOfLA, Oct 8, 2018
  3. Dxta

    Dxta Senior Member

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    1. The modules could leak electrolytes anywhere it wants to.
    You can't seal the leaks. But try it. No harm trying.

    They can't be savaged. As long as they have leaks, you got to order replacement modules, cycle them, and the modules in the pack.

    As long as they have leaks, it does not matter in what order you place the modules.

    In future, they'd be significant leaks, and you'd be forced to open up the pack again.

    2. I normally reshuffle the modules, placing the replacement modules at the end of the pack to aid easy removal (don't forget to also place the middle modules at the end of the pack).

    That would help with heat distribution.

    PS: the IR of your modules are dammed high.
    That pack maybe at the end of its lifespan already.

    You could use your replacement modules of the stated IR. But the problem would be that with time, the modules may get out of balance.
     
    #3 Dxta, Oct 9, 2018
  4. exstudent

    exstudent Senior Member

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    Is this a serious question?

    If a strut/shock is leaking oil, would you attempt a leak repair on said suspension component?

    READ this article from Consumer Reports dealing w/ leaking alkaline batteries; granted we are dealing w/ a NiMh battery and not an alkaline battery, but the same principles/concepts of seal integrity apply. Why Do Batteries Leak? - Consumer Reports

    More importantly, your profile indicates you have a 2008 Model Year Prius.
    • Are you aware that the Warranty on the Prius HV pack is 10yr/150K miles, if the car has continually maintained registration in a CARB State? Some members have reported exceptions to this rule.
    • Do you have more than 150K miles?
    • Is this a salvage title vehicle? Salvage vehicles are NOT eligible for any warranty and recall work.
     
    #4 exstudent, Oct 9, 2018
    Last edited: Oct 9, 2018
    JC91006 likes this.
  5. JC91006

    JC91006 Senior Member

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    I find it strange you have a transaxle and battery failure all at the same time. Did you just buy this vehicle?
     
    #5 JC91006, Oct 9, 2018
  6. BlueOfLA

    BlueOfLA Junior Member

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    Dxta: Thanks for the tips, I shuffled the modules like you said :D

    I ended up using the replacement modules rather than try to repair..

    JC91006:
    I've had the car for over a year now and it's treated me well up until now. Techstream was showing 613, but I'm wondering if it never was the Transaxle to begin with and it threw a false positive 613. But then again, maybe it did start with Trans because it was occasional, only when READY and driving; whereas now with the 612 it appears when the car is IG-ON not ready.
     
    #6 BlueOfLA, Oct 9, 2018
  7. JC91006

    JC91006 Senior Member

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    The diagnostics of the P0AA6 is very difficult, most dealers will charge 3 to 4 hours of labor to do it right. It's not just based off a code that spits out. That code just tells you some computer has picked up an error, and many times the error it picks up is coming from another error.....

    Who did the transaxle work? Maybe you can get that part back LOL
     
    #7 JC91006, Oct 9, 2018
  8. BlueOfLA

    BlueOfLA Junior Member

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    I did the work myself and I’ve got the part still.

    I know.. should have tested with a megger before replacing something that’s going to be labor intensive! I thought for sure with the tech stream pointing to 613 I had the culprit.
    —
    Before replacing Transaxle: 613 warning would show up once in the morning on the way to work (only when ready on), but in the afternoon there was no warning.

    After replacing Transaxle: 612 warning showed up non-stop a minute or so after IG-ON non-ready.
    —

    After replacing 2 leaking cells and a balance: it’s only been 1 day, but no warnings so far! (y)
     
    #8 BlueOfLA, Oct 9, 2018
  9. JC91006

    JC91006 Senior Member

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    You probably don't want to mess with that transaxle, it would suck to put it in a car and it ends up not working
     
    #9 JC91006, Oct 9, 2018
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