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OBD II Fault Code

  • OBD II P0C4C

    OBD-II Code High voltage system may not operate is defined as a Hybrid Battery Pack Coolant Pump Supply Voltage Circuit Low

    The Hybrid Battery Pack has its own dedicated Coolant Pump to circulate coolant through the battery pack. This coolant pump is controlled by the Hybrid Powertrain Control Module. If the coolant pump does not operate as requested, code P0C4C will be stored.

    High voltage system may not operate Symptoms

    • High voltage system may not operate

    Common Problems That Trigger the P0C4C Code

    • High voltage powertrain control module failure
    • Leak in the high voltage cooling system
    • Low coolant in the high voltage system
    • Water pump failure
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