1. Attachments are working again! Check out this thread for more details and to report any other bugs.

A C compressor causing P0AA6 code

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Seymour1, Jul 19, 2024 at 4:03 PM.

  1. Seymour1

    Seymour1 Junior Member

    Joined:
    Feb 8, 2024
    150
    16
    0
    Location:
    22967
    Vehicle:
    2010 Prius
    Model:
    Three
    My newly purchased 2010 Prius with 229,000 miles has a blown 40 amp fuse for the A C compressor. And, I was getting P0AA6 codes, yellow triangle and "Check Hybrid System". I bought a Vici 500 volt megohmmeter. The battery is O K. The motor/generaters are O K. I disconnected the cable going to the A C compressor. The fused side of the cable acted like charging a capacitor to > 20 megohms. The unfused side read 0 ohms with the Vici tester. The inverter reads 1.9 megohms.
    I cleared the codes and did not reconnect the compressor cable. When I drove the car, there was no triangle or "Check Hybrid System".
    For the time being, I want to drive the car without buying a new compressor. The inverter has an empty hole where the cable was plugged in. I worry about dirt entering the inverter. If I plug in the compressor cable at the inverter, will the triangle or the "Check Hybrid System" cause a problem? Would it be safe to unplug the high voltage cable at the compressor? I do not plan on turning on the A C controls on the dash.
     
    #1 Seymour1, Jul 19, 2024 at 4:03 PM
  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    23,990
    15,583
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Wow! You mean this one, right?

    [​IMG]

    I would never have guessed that one would be 40 amps. That would be over 8 kilowatts at 201.6 volts, and I've never seen the A/C exceed 3 kW. I might have guessed the fuse was 15 or 20 amps. But it sure does say 40A in that picture, doesn't it?

    You could disconnect that cable at the compressor, and put a bunch of turns of self-fusing silicone tape (e.g. Rescue Tape) around the disconnected end to insulate it, and find a way to secure it from banging about, and then reattach the inverter end to keep that opening closed.

    This will either give you another P0AA6 or it will not. If it doesn't, you can go on driving until you feel like replacing the compressor. If it does, you'll know the fault is in the cable and maybe not the compressor, and that might be welcome news.
     

    Attached Files:

    #2 ChapmanF, Jul 19, 2024 at 5:40 PM
(You must log in or sign up to post here.)