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OBD II Fault Code

  • OBD II P0633

    OBD-II Code Engine may not start is defined as a Immobilizer Key not Programmed - ECM/PCM

    The ignition key has not been programmed to the vehicle. If an unprogrammed key is used to attempt to start the vehicle, code P0633 will set and the anti-theft light will be illuminated.

    Engine may not start Symptoms

    • Anti-theft light illuminated
    • Engine may not start

    Common Problems That Trigger the P0633 Code

    • Anti-theft control module failure
    • Key in use is not programmed to the vehicle
    • Wiring issue

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