Dreaded P0AA6 CODE AND CAR WONT GO INTO GEAR

Discussion in 'Gen 2 Prius Main Forum' started by LINGARAJU GOTTUMUKKALA, Jun 16, 2025 at 6:20 PM.

  1. LINGARAJU GOTTUMUKKALA

    LINGARAJU GOTTUMUKKALA Junior Member

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    this post is more for my satisfaction as I dropped mine at the salvage today, 05 Prius with 267k miles, OEM hv battery replaced with cylindrical 3rd party hv battery 5 years ago, 12v battery replaced 3 years ago, lately I've been getting random red triangle of death with issues of isolation fault ( 3 times including today), inverter performance below optimal ( 2 times) and ac suddenly stopped working last week and not blowing as much cold air, have been driving until it dies and been using OBD2 to clear codes and been running the car since these issues started 2 months ago and codes only came up like 4 times so far in 2 months and car drove fine after clearing codes but today car would not go into ready mode and only into neutral and strangely these happened a day after it rained ( have replaced both tail lights few years ago) and today saw there is water where the accessory tire would be and to the left below where the hv would be, I just did not have the patience anymore as car suddenly died on me today in a driveway, I am mostly mad at myself for deciding in a flash to get rid of it, what could have I done to get few more miles out of the car, thanks for hearing my pain today.
     
    #1 LINGARAJU GOTTUMUKKALA, Jun 16, 2025 at 6:20 PM
  2. rjparker

    rjparker Tu Humilde Sirviente

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    #2 rjparker, Jun 16, 2025 at 6:36 PM
  3. ChapmanF

    ChapmanF Senior Member

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    Yeah, the word 'dreaded' gets used in a lot of posts about a lot of codes.

    I wouldn't necessarily react to a P0AA6 code with dread. There's an INF code to indicate in which of four areas of the car the isolation fault happens to be, and then with some patient investigation sometimes it doesn't turn out to be a difficult or costly fix. Sometimes it does, too, but I wouldn't jump right to dreading that at first.
     
    #3 ChapmanF, Jun 16, 2025 at 6:38 PM
  4. dolj

    dolj Senior Member

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    This is a good example of not letting faults accumulate.
    I am presuming the "inverter performance" code is P0A93. If so, then there are two possibilities with that code – more commonly, the inverter coolant pump has failed, and the less common problem with the radiator cooling fans not working (or not working correctly).

    If the inverter is not being cooled well, one of the casualties is the A/C. The inverter will cut power to the A/C to in order to decease the load on the inverter.
     
    #4 dolj, Jun 17, 2025 at 4:32 AM
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