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OBD II Fault Code

  • OBD II P278C

    OBD-II Code Decreased engine performance is defined as a Kick Down Switch Circuit Low

    The kick down switch tells the transmission when to downshift the transmission so the vehicle can accelerate faster. If the kickdown switch sends an implausible signal to the transmission control module (TCM), code P278C will be stored.

    Decreased engine performance Symptoms

    • Decreased engine performance

    Common Problems That Trigger the P278C Code

    • Kick down switch failure
    • Transmission Control Module (TCM) failure
    • Wiring issue
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