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P0AA6 DRIVING IN A FLOOD

Discussion in 'Gen 3 Prius Main Forum' started by franken1313, Jul 9, 2018.

  1. franken1313

    franken1313 Member

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    I recently drove in a flood and while driving I got check hybrid system. I have dtc code P0AA6 'hybrid battery voltage system isolation fault'. What do I replace???
     
  2. bisco

    bisco cookie crumbler

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    probably a high voltage leak, maybe a/c compressor. maybe the hybrid battery. i don't think water could get into the tranny, but not sure. how deep was the water?

    your car is unsafe, high voltage is leaking to the chassis. i would not drive it until the fault has been located and repaired. someone else posted a tsb on troubleshooting and repairing a flooded car.
    you need tech stream to read the sub codes.

    all the best!(y)
     
    #2 bisco, Jul 9, 2018
    Last edited: Jul 9, 2018
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  3. franken1313

    franken1313 Member

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    The water wasn't that deep maybe at the rocker panels.
     
  4. franken1313

    franken1313 Member

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    I have Autel Maxidas DS808 can this read the subcodes?
     
  5. bisco

    bisco cookie crumbler

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    no. look through the battery threads, there are a few obd scanners that will work. torque, iirc.
     
  6. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    The car.

    (sorry....couldn't resist!)
    The problem in your case probably is not how deep the water was, but rather what kind of bow wave you were producing, and where all of that water was going.
    My thinking is that you clear the code and see if its recurring, and then see of your fault is in the battery or the "transmission" which will give us an indication on next steps....
    Do you happen to have a megohmmeter?
    Back when dinosaurs roamed the earth they used to have crank handles on them, and 99.99999999999999999 percent of the time we used them for purposes OTHER than checking wires for insulation problems.....:D

    There's a small chance that this problem will self-clear.....but there's a HUGE chance that some unscrupulous dealer......which is to say nearly ANY dealer will see this code and immediately jump to the traction battery.... so be careful!

    Good Luck!
     
    #6 ETC(SS), Jul 10, 2018
    Last edited: Jul 10, 2018
  7. TMR-JWAP

    TMR-JWAP Senior Member

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    Back when dinosaurs roamed the earth they used to have crank handles on them, and 99.99999999999999999 percent of the time we used them for purposes OTHER than checking wires for insulation problems.....:D

    Wow, does this bring back memories of the used-ta-fish 606 and 719. Here, hold these leads for a sec.....followed by a quick crank

    Been on both ends of that experience....the crazy things guys do when bored from poking holes in the ocean.
     
  8. ITBland

    ITBland Active Member

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  9. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    Yeah, right?
    I was a boomer weenie (Chicken of the Sea) but my brother was on the Green Thing (614) and the front half of the USS Sanfranlulu (718)
     
  10. franken1313

    franken1313 Member

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    I ran the test and the code comes back while on neutral. So that means the high voltage battery. What would be the next step?
     
  11. bisco

    bisco cookie crumbler

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    pull the battery out and open it up to assess the situation. be careful, high voltage is DEADLY!
     
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  12. Dxta

    Dxta Senior Member

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    My guess is from the HV battery pack area.
    The contractors and the ECU might have shorted out from the flooded water.
    That would have also, if you aren't lucky, discharged the battery pack.

    If you don't attack this problem with the attention it deserves, you might end up, having the complete pack replaced.

    Bear in mind that rate of corrosion or damage on the HV battery system components, increases with everytine delayed.

    You may be replacing some few stuffs in there.

    I have handled some highlanders, prii, and camries with flooded battery pan.
    These pictures might help.

    PIC 1-2: HV contractors corroded due to flooded water
    PIC 3: Battery pack on display showing extent of corrosion
    PIC 4: Shorted out ECU
    PIC 5: Level of flood on the highlander
    IMG_20180522_084829.jpg IMG_20180522_085044.jpg IMG-20170725-WA0005.jpg IMG-20170725-WA0006.jpg IMG-20170724-WA0001.jpg
     
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  13. Grit

    Grit Senior Member

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    :eek:
     
  14. Dxta

    Dxta Senior Member

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    OMG! I was eating some sandwiches, that was y!
    Contactors
     
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  15. franken1313

    franken1313 Member

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    The car is driving fine. The battery seems fine also. The cruise control doesn't work and the EV, ECO & POWER MODE mode buttons do not work that's the only thing.
     
  16. franken1313

    franken1313 Member

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    I can get a hold of a megohmmeter
     
  17. franken1313

    franken1313 Member

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    I just got techstream. Where do I find the subcodes? 20180716_213038.jpg
     
  18. Raytheeagle

    Raytheeagle Senior Member

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    See that snowflake on the left;)?

    Click on it and then see the sub codes on the next screen(y).
     
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  19. franken1313

    franken1313 Member

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  20. Dxta

    Dxta Senior Member

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    From the subcode you showed, it appears you have an insulation problem within the car's HV system.

    The likely areas could be any of the following:

    Frame wire•System main relay•System main resistor•HV battery assembly•Electric inverter compressor•Battery ECU•HV transaxle assembly•Inverter with converter assembly•Main battery cable•No. 2 main battery cable•Battery plug•No. 2 frame wire•Junction block.

    Since the problem came up just when you went through the flood, my quess could be that the problem might be on the HV battery pack area.

    Have you opened up the cover of the pack to assess the pack itself?

    Can you post the fatalist of the info from your tech stream here please?


    Dxta