Our automotive experts have put together the following information about the P0C4B diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0C4B code.

OBD II Fault Code

  • OBD II P0C4B

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

    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 P0C4B will be stored.

    High voltage system may not operate Symptoms

    • High voltage system may not operate

    Common Problems That Trigger the P0C4B 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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