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Our automotive experts have put together the following information about the P0C31 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 P0C31 code.

OBD II Fault Code

  • OBD II P0C31

    OBD-II Code High voltage system may not operate is defined as a Inverter "B" Cooling System Performance

    The Inverter for the hybrid system utilizes a separate cooling system to maintain proper operating pressure. If the High Voltage Control Module detects an issue with the cooling system for the hybrid system, code P0C31 will be set. The High Voltage System may be disabled.

    High voltage system may not operate Symptoms

    • High voltage system may not operate
    • High voltage system may overheat

    Common Problems That Trigger the P0C31 Code

    • Coolant system leak in the hybrid cooling system
    • Inverter/converter water pump failure
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