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OBD II Fault Code

  • OBD II P063B

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

    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 P063B.

    Engine may not start Symptoms

    • Engine may not start
    • Engine may stall

    Common Problems That Trigger the P063B Code

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

    Common Repairs Needed for the P063B Code

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