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Our automotive experts have put together the following information about the P278B 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 P278B code.

OBD II Fault Code

  • OBD II P278B

    OBD-II Code Decreased engine performance is defined as a Kick Down Switch Circuit Range/Performance

    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 P278B will be stored.

    Decreased engine performance Symptoms

    • Decreased engine performance

    Common Problems That Trigger the P278B Code

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