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OBD II Fault Code

  • OBD II P0851

    OBD-II Code Engine may not start is defined as a Park/Neutral Switch Input Circuit Low

    The engine computer (PCM) needs to know when the transmission is in Park/Neutral, as this is required before the vehicle can safely be started. The PCM depends on the park/neutral safety switch to communicate when the transmission is in Park/Neutral. If the Park/Neutral Safety Switch fails to operate properly, code P0851 will be set. The engine may be disabled from starting.

    Engine may not start Symptoms

    • Engine may not start

    Common Problems That Trigger the P0851 Code

    • Neutral safety switch failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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