OBD II Fault Code

  • OBD II P0839

    OBD-II Code 4-wheel drive light is flashing is defined as a Four Wheel Drive (4WD) Switch Circuit High

    The 4-Wheel Drive Switch Circuit tells the Transmission Control Module (TCM) what mode the 4-wheel drive system is in (i.e. 4-wheel high, 4-wheel low, 2-wheel). If this switch does not send back a plausible signal, code P0839 will be stored and the 4-wheel drive system may be disabled.

    4-wheel drive light is flashing Symptoms

    • 4-wheel drive light is flashing
    • 4-wheel drive system is disabled

    Common Problems That Trigger the P0839 Code

    • 4-wheel drive switch failure
    • Transfer case switch failure
    • Transmission Control Module (TCM) failure
    • Wiring issue

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