Removing corrosion in connection points

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by brka-brkb, Jan 7, 2026.

  1. brka-brkb

    brka-brkb New Member

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    Hello!

    My 2005 Prius is showing P3000 and C1310 codes with the red triangle, and it appears from my research that corrosion in one or more of these connection points is a possible cause:

    - Copper bus bar
    - Sensing harness
    - Fan connector
    - HV ECU pins
    - 12V battery terminal    ​

    Of these parts, where can I buy the fan connector and HV ECU pins (connector), as I can't seem to find them on eBay or Amazon like I did with other parts?

    And if the corrosion is minor, how would I go about cleaning them, especially in narrow spaces? I assume some sort of specialized brush like this one would be needed, and for cleaning chemical, would something like these be okay to use?
    Thank you!

    ​
     
    #1 brka-brkb, Jan 7, 2026
  2. dolj

    dolj Senior Member

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    I can only speak to this point.

    Most people just cut this connector out and solder the wires together. If you want to keep the ability to plug/unplug this connection, just buy a 3-pin waterproof connector and cut out the old one.
     
    #2 dolj, Jan 7, 2026
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    You need a more capable scantool.

    C1310 is a code in ABS that says "there's a problem in the Hybrid Control ecu".
    P3000 is a code in Hybrid Control that says "there's a problem in the High Voltage battery ecu".

    There are a few INF detail codes for the P3000, but now you need to check the HV battery ecu for codes before replacing parts.

    Posted via the PriusChat mobile app.
     
    #3 mr_guy_mann, Jan 7, 2026
    Last edited: Jan 7, 2026
    Brian1954 likes this.
  4. Brian1954

    Brian1954 Senior Member

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    #4 Brian1954, Jan 8, 2026 at 9:33 AM
  5. brka-brkb

    brka-brkb New Member

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    Sorry about the double post. I wasn't sure if my latest post on the older thread would receive readership or not. Thank you for your responses!
     
    #5 brka-brkb, Jan 8, 2026 at 1:57 PM
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