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Our automotive experts have put together the following information about the P0643 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 P0643 code.

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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