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What Does P0642 Code Mean?

    OBD-II Code P0642 is defined as a Sensor Reference Voltage "A" Circuit Low

    The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an incorrect output signal, it will set code P0642.

    P0642 Symptoms

    • Engine may not start

    Common Problems That Trigger the P0642 Code

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

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