Our automotive experts have put together the following information about the P0A78 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 P0A78 code.

OBD II Fault Code

  • OBD II P0A78

    OBD-II Code High voltage system may not operate is defined as a Drive Motor "A" Inverter Performance

    The Inverter portion of the Inverter/Converter Assembly converts the direct current (DC) voltage from the battery to a three phase alternating current (AC) to drive the hybrid motor and transaxle assembly. If the High Voltage control module detects an issue with the inverter assembly, it will set code P0A78.

    High voltage system may not operate Symptoms

    • High voltage system may not operate

    Common Problems That Trigger the P0A78 Code

    • High voltage control module failure
    • Inverter/converter assembly failure
    • Wiring issue
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