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OBD II Fault Code

  • OBD II P0643

    OBD-II Code Engine may not start is defined as a Sensor Reference Voltage "A" Circuit High

    The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an issue with this signal, it will set code P0643.

    Engine may not start Symptoms

    • Engine may not start

    Common Problems That Trigger the P0643 Code

    • Engine sensor failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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