'04 Electrical connector corrosion and HV battery codes?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Nathan Quattrini, Feb 27, 2018.

  1. Nathan Quattrini

    Nathan Quattrini Junior Member

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    So my 2004 Prius has been driving oddly lately. It's acting as if the HV battery has died (this did happen twice before, I had it replaced refurbished so I'm familiar with how it behaves when the HV battery dies) however when the battery was tested by the refurbishing guy everything appeared normal, I sat next to him and he explained the whole process. The car also drives better seemingly in warmer weather, but any time it goes close to freezing temperature outside it acts up, shifting strangely etc.

    Two days ago the "Problem" lights popped on and I immediately went and had the codes read at a local auto part store, not surprised that code P0A80 popped up, but also P3000. Researching these combined codes led me to this post :

    2004 Prius, 176k. Error Codes: P3000; P0A80; C1259; C1310 | PriusChat

    In reply #8 he said one of the electrical connectors was corroded. I pulled my car apart and found this connector that looks corroded. Could anyone tell me if this is the connection that seems to be a common problem? Also do you clean the connection (How do you clean one? Do you need to unplug the HV battery before hand? I've never done this) or do you need to buy new wires to resolve the issue?

    Any help would be greatly appreciated, thank you!
     

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  2. JC91006

    JC91006 Senior Member

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    You normally would see codes P3000 and C1259 when you have a battery failure. That doesn't mean it's a separate problem. Just goes with the P0A80. Change the battery and your problems should go away
     
  3. Nathan Quattrini

    Nathan Quattrini Junior Member

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    The warning lights actually cleared themselves with the warmer weather today which lead me to digging deeper to see what's going on. The post I referenced had very similar issues, thus I'm wanting to know how to handle corrosion to see if that first fixed the issue.
     
  4. JC91006

    JC91006 Senior Member

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    Your issue is P0A80
     
  5. Nathan Quattrini

    Nathan Quattrini Junior Member

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    Do you know how to clean the corrosion? That is my current question, if yes please explain in detail. If no, please allow other people to chime in for the questions I am asking. Thanks!
     
  6. JC91006

    JC91006 Senior Member

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    You can clean electronics using an electronic cleaner...it's in a spray can, where you normally would buy MAF and Throttle body cleaner. Anyways good luck chasing the ghost
     
  7. ChapmanF

    ChapmanF Senior Member

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    Hi ,

    The P0A80 code is reported by the battery ECU, and it tells you what is going on with the battery.

    The P3000 code is reported by the HV ECU, and what it means is, there's a code from the battery ECU. (If you want to pull up the specific P3000 inf code you've got, it can give you a little more detail about what the battery ECU code is ... on the other hand, you already know what the battery ECU code is.)

    The C1259 code is reported by the brake/skid ECU, and what it means is, the HV ECU has a code for you (as you already know). The different ECUs in the car do talk about each other a lot.

    You can look these all up in the repair manual. The P0A80 is set if the voltage difference between blocks in the battery goes out of spec. If you want to check the conditions of connections in the battery, and you have the time for it, of course you can; just be sure to find and understand a good writeup on the procedures and precautions for mucking inside the battery. (A really good source if you find it online is the PDF of the Gen 1 battery re-sealing campaign instructions; it's not the generation you've got and things will be different, but it's a great document for basic procedures and safety.)

    It's likely the battery's ready for replacement though.

    -Chap
     
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