2005 - Dying Accessory Battery... wait a minute... huh?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by pumpanddump, Sep 21, 2025 at 2:50 PM.

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  1. pumpanddump

    pumpanddump Junior Member

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    No red triangle... But the usual suspects of DTC are back. Looks like i need to address the battery. However, surprisingly nothing appears for Engine...but only as INC. So its not complete? I think i need to check fuses. I already mentioned all fluids are great.

    The test drive was nothing dramatic, but up hill, down hill. Soft acceleration to hard acceleration, same for brakes. Everything seems the same. I saw no reduction in performance...for a 2005.
    The dash monitor is impossible to read, its burnt out...so no arrows.
    I forgot to do the battery monitor test in the dash, i can do that later tonight.
     

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    #21 pumpanddump, Sep 23, 2025 at 9:12 PM
  2. dolj

    dolj Senior Member

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    • P3000 means the hybrid control ECU heard from the hybrid vehicle (HV) battery ECU that it has a problem.
    • C1259 means the skid control ECU heard from the hybrid vehicle (HV) battery ECU that it has a problem.
    • C1310 means the skid control ECU heard from the hybrid vehicle (HV) battery ECU that it has a problem. It prohibits Enhanced VSC operation and a part of ECB control by the fail-safe function.
    • B1421 is a binary switch (i.e. indicates on/off) and is not a problem unless you read this code in bright sunlight. Its normal function is to tell you that it sees bright sunlight or not, and if that lines up with what happened, there is nothing wrong.
    The DTC to focus on is:
    • P3014 means battery block 4 becomes weak.
    Followed by:
    I hope that helps.
     
    #22 dolj, Sep 24, 2025 at 1:14 AM
    Last edited: Sep 24, 2025 at 1:23 AM
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