2005 Prius trouble codes P0A08 and P0A09

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by toolman102, Apr 29, 2019.

  1. toolman102

    toolman102 New Member

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    I just bought a 2005 Prius with a dead HV battery. When I replaced the HV battery I had some trouble codes pop up. P0A08, P0A09 & C1310. I'm thinking if I can correct the P0A codes that the C1310 code should go away too. The car runs just fine but has the red triangle and yellow exclamation point with circle. Also has the warning lights on the display for aux battery and car with exclamation point.

    I have already replaced the aux battery, fuseable link harness, inverter converter and water pump. I checked all the fuses. I am at my wit's end at this point not knowing what else to check. I do k ow that water was getting in to the trunk area but don't know what that could have effected. My guess at this point is that there is some type of connection that is loose or damaged bit still allowing the car to run and charge just fine.

    Any insight would be helpful. Thanks you.
     
  2. bisco

    bisco cookie crumbler

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    you clear the codes, and they keep coming back?
     
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    What is the evidence that the car is charging just fine? I am referring to the 12V battery being charged, not the high voltage traction battery.

    My guess is that, besides having a failed high voltage battery, this car also had a bad 12V battery and suffered from a botched jumpstart where the battery polarity was reversed. Hence the 100A DC/DC fusible link blew. Further, the DC/DC converter within the inverter was damaged. Am I on the right track?

    If I am, and you have replaced the inverter and the fusible link within the main relay/fuse box next to the inverter, then measure voltage across the 12V battery when the Prius is READY. The voltage should be around 13.8VDC. If it is much lower, then either the replacement inverter is not working, you failed to replace the 100A DC/DC fusible link, or you have other wiring harness damage.
     
  4. toolman102

    toolman102 New Member

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    Yes i cannot clear the codes as they reappear instantly
     
  5. toolman102

    toolman102 New Member

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    The fusable link I replace was the one directly on the aux battery. I have been driving it around a little bit to see of the aux battery would hold a charge. I get 12.8 volts with nothing on and 13.8 with ready. I have not been driving it alot bit the previous owner said he was able to drive around with no problems. I also checked the fuses under the hood to and all seem to be good.
     
  6. toolman102

    toolman102 New Member

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    Any other ideas????
     
  7. Jipapipa

    Jipapipa New Member

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    Did you get any resolution to this?

    I'm having exactly the same problems with my 2nd gen Prius here. I'd love to hear if there was some solution. Thanks!
     
  8. Steven Walker

    Steven Walker Junior Member

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    I have a 2008 Prius, same problem. P0A09-591 after resetting codes with TechStream and Dr Prius with car off, once engine is started then it also registers P0A08-264 as well. Just replaced inverter with a known good one, 12V battery is good, all fuses good, replaced fusible link at 12v battery. Battery is 12.5V with car off, 13.9V in ready, checked everything I can think of. Anyone have any thoughts? No other codes than these ones. Car still works fine, just want that code and red triangle gone. Any help would be really appreciated. Thanks
     

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  9. bisco

    bisco cookie crumbler

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    have you researched the codes in the service manual?
     
  10. Steven Walker

    Steven Walker Junior Member

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    So I solved my own problem after posting this earlier this evening... when I bought this car almost 2 months ago I found an old mouse nest on the right rear wheel well near the battery cooling fan. I removed it then, never thought any more about it. After many hours of searching why I had the red triangle ,which included replacing the inverter and inverter pump, testing all fuses, plus many more testing hours, I noticed the black protective sleeving over the wires in the area where that nest was was a little wrinkled. I cut that black protective sleeve back and found a wire that a mouse had chewed and it all turned green and rotted off. I replaced that 2” section of wire and the red triangle is gone. Codes P0A08, P0A09 are also gone which I tried resetting many times in the past unsuccessfully. See pictures below. It’s the white wire in that group of wires. That was a tough one but problem solved. BBBBD642-20D0-4129-BFD1-3AE823E25470.jpeg 560F8B79-3CD1-4301-94C0-03D52E0C4A14.jpeg A5B3E3FD-0931-44C5-A82F-56CA28D088D4.jpeg BBBBD642-20D0-4129-BFD1-3AE823E25470.jpeg 560F8B79-3CD1-4301-94C0-03D52E0C4A14.jpeg A5B3E3FD-0931-44C5-A82F-56CA28D088D4.jpeg
     
    bisco, PriusGuy32 and Dxta like this.
  11. ilbdarned

    ilbdarned New Member

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    I just wonder how a mouse got in your car, I assume that is where the wire was, inside. Not sure where the outside air comes in when your ac is set to vent, but I have a silverado and a mouse got in there and died, stupid GM did not put a screen over the the hole so I had to.
     
  12. Zamprius

    Zamprius Junior Member

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    Remove connector and joint wires as per color code ... please note cut and joint one wire at a time.
    IMG-16b21442d5793b2f2e3e721a51085c25-V.jpg IMG-6d2001a8f7a1bea647667baf16561cbd-V.jpg IMG-b2be2999902a9ffcdb6ff6bfbbce03c9-V.jpg
     
  13. Gino Veltri

    Gino Veltri Junior Member

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    What is the significance of that connector having that green corrosion on those pins? And the solution? mine has similar but less severe corrosion.
     
  14. dolj

    dolj Senior Member

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    The presence of corrosion of those pins is indicative of a leak originating from the rear of the roof channel. (There are many threads that cover this problem.) You should check under the 12 V battery for standing water too and deal with that. If the plug fails from the corrosion the hybrid vehicle battery cooling fan, which is below it, will stop working and you will get hybrid system errors. You should deal with the leak and rehab the plug and connector if possible.
     
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