? c1241 detailed freeze DTC 81

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Intuitionx2, Mar 17, 2026.

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  1. Intuitionx2

    Intuitionx2 New Member

    Joined:
    Jul 18, 2025
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    Location:
    usa
    Vehicle:
    2008 Prius
    Model:
    Base
    ig1, ig2 8.03v

    Had a bad 12v battery. Replaced it. Now getting c1241/81
    The power coming from the battery 12v capacitor 12v. the fuses all show 12v
    C1241 Low battery positive voltage
    C1256 Accumulator low pressure fault

    I'm not finding any good guides on diagnosing this. My sons car. I'm not sure if the codes were present before the battery went bad.

    2006 Prius 200k
    battery tender via solar panel & controller (Renogy Wanderer10A Amp12v/24v PWN negative ground)
     

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    #1 Intuitionx2, Mar 17, 2026
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