Trouble Codes and Check Hybrid System

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Matt Baledge, Nov 29, 2022.

  1. Matt Baledge

    Matt Baledge New Member

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    Hello PC forum! first post here, and it's a doozy.

    Recently pulled the dreaded Triangle of Death. Here's the story:

    Pulled away from a stoplight, the car lurched and went into limp mode. The traction control light came on, and a "Check Hybrid System" message appeared. Luckily, I was only a block away from my destination and I was able to have it towed home to check out. Did some troubleshooting and came up with the following codes:

    P0A7A
    P0A94
    C1259
    C1310

    I dug in and started doing typical checks from info I've found by lurking here. Checked the 12V battery, it's fine. Checked the hybrid battery fan and all connections, also fine (even cleaned the fan while I was in there). Noticed that there was no turbulence in the Inverter Cooling reservoir, so I replaced the pump. Got the car back together, hoping that was the issue, and... still all the same errors. I'm kind of befuddled by this, and somewhat at a loss for what to investigate further. I certainly don't want to have it towed to a dealership (my dealer charges $195 just to scan it) and I feel like I'm just one poke or prod away from getting this thing back on the road. So, what's next? Is there something I might have missed putting the car back together? Is there anything else I should check before I bite the bullet and take it in?
     
  2. Tombukt2

    Tombukt2 Senior Member

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    Did you clear the codes after reassembly before starting the car?? you need to do this. Then start the car run it drive it if it will whatever and see if codes come back The no turbulence in the inverter reservoir is definitely a clue you don't want that to be going on so if that's been rectified clear the codes restart the car and see what's up
     
  3. Matt Baledge

    Matt Baledge New Member

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    Yeah, I tried to clear the codes using my Carista; but they won’t clear. Tried both before and after the repair, and before and after the repair. After the repair, it’s clear that there’s movement in the reservoir, so that’s good at least.
     
  4. Brian1954

    Brian1954 Member

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    Do NOT clear the trouble codes..

    There are many different subcodes associated with the P0A7A and P0A94 trouble codes. Some of those subcodes point to the inverter. If you do not have a scan tool capable of showing you the subcodes, I would take it to a Toyota dealer for diagnostics. If the problem is the inverter, it will probably be covered under warranty and the repair will not cost you anything.

    What year is your Prius and how many miles?

    Posted via the PriusChat mobile app.
     
    #4 Brian1954, Nov 30, 2022
    Last edited: Nov 30, 2022
  5. Matt Baledge

    Matt Baledge New Member

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    2013 Prius with 133k miles.
     
  6. bisco

    bisco cookie crumbler

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    have you had the ipm update?
     
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