SUB-BATTERY MALFUNCTION INTEGRATED CAPACITOR (INTEGRATION CONTROL SUPPLY)

Discussion in 'Gen 5 Prius Care, Maintenance and Troubleshooting' started by otatrant, Jun 1, 2025 at 1:43 AM.

  1. otatrant

    otatrant Active Member

    Joined:
    Sep 5, 2023
    170
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    Location:
    San Francisco
    Vehicle:
    2023 Prius Prime
    Model:
    XSE Premium
    Got a message while driving that SUB-BATTERY SYSTEM MALFUNCTION back in April. Was able to clear the message by restarting the car. When the error popped up I lost the ability to use radar cruise control. Happened again a couple of weeks ago and my dealer called me while I was driving and set up an appointment.

    Here is a picture of the error message. Sub-Battery System Malfunction.jpg

    Took it into the dealer this last week and here is a summary of the service which was covered under warranty.

    SUB-BATTERY MALFUNCTION.jpg

    They wanted to know if I had installed any aftermarket accessories which I haven't. Still a mystery as to what triggered the INTEGRATED CAPACITOR (INTEGRATION CONTROL SUPPLY) part to fail.

    Interested to hear if anyone else has run into this issue.