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P0AA6 Next Step Suggestions? Dr. Prius / Torque

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by personalityprofile, Aug 24, 2021.

  1. personalityprofile

    personalityprofile New Member

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    I got a P0AA6 error recently but don't have a way to pull the sub code. Car drove home fine that day, I reset the code and have been driving it a since. Car is a 2011 with 163k miles. Previous owner replaced the battery with a reconditioned one a few years ago, and then replaced a few cells later but I don't think he balanced them. I feel like replacing the cells one at a time is going to be a constant headache. Dr Prius Says "Poor balance block: #1, 2, 3, 14 - Poor balance block: #8". 8 looks like the real problem from watching the Dr Prius app while driving.
    Should I be thinking about going with a Prolong? Any other suggestions?

    Car was averaging about 42 mpg for the first few thousand miles I drove it, now down to 40mpg

    There are a bunch of screenshots from Dr. Prius and Torque here:
     
    #1 personalityprofile, Aug 24, 2021
  2. personalityprofile

    personalityprofile New Member

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    I should also mention that the inverter was replaced just before I bought the car back in May
     
    #2 personalityprofile, Aug 24, 2021
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    From previous work performed on the car, the most important thing you can do right now is get the subcode to determine the actual location of the problem, unless you're familiar with ground fault isolation and operation of a megger device.

    I'd hate to think the inverter got changed out trying to chase down a P0AA6
     
    #3 TMR-JWAP, Aug 24, 2021
  4. personalityprofile

    personalityprofile New Member

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    Probably a dumb question, but I can't pull a sub code if i've already cleared the code, right?

    Do you think the P0AA6 is unrelated to the battery stuff that Dr. Prius is showing? I had just washed the car when it came one, so possibly water intrusion/grounding related?
     
    #4 personalityprofile, Aug 25, 2021
  5. bisco

    bisco cookie crumbler

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    block number 8 might have a leaky cell. the code is a high voltage leak. subcode will narrow it down.

    if it's not in the battery, you have to check the tranny, inverter and a/c compressore, along with the wiring harness.
    maybe water did get in somewhere
     
    #5 bisco, Aug 25, 2021
  6. ChapmanF

    ChapmanF Senior Member

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    Yes, absolutely it's unrelated to the sort of battery stuff Dr. Prius shows.

    P0AA6 can be related to moisture/humidity, but whether it is in this case is just something to be found out. Best thing is if it is reported again, read the INF codes. If 526 is the only one, don't clear anything, power the car off and back on again, read the INF codes again.

    If you can't get the specific INF code (the one that isn't 526), it's still possible to troubleshoot the issue, you just have to go through all the tests in the P0AA6 section of the manual. Having the specific INF code lets you focus on that one area and skip the others.
     
    #6 ChapmanF, Aug 26, 2021
  7. bisco

    bisco cookie crumbler

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    a strange flurry of P0AA6 this week. post pandemic corrosion?
     
    #7 bisco, Aug 26, 2021
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