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OBD II Fault Code

  • OBD II P063D

    OBD-II Code Engine may not start is defined as a Generator Voltage Sense Circuit High

    The Alternator recharges the Battery when the engine is running. The Alternator is controlled by the engine control module (PCM). If the PCM detects an incorrect signal from the Alternator, the PCM will set code P063D.

    Engine may not start Symptoms

    • Engine may not start
    • Engine may stall

    Common Problems That Trigger the P063D Code

    • Alternator failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

    Common Repairs Needed for the P063D Code

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