Our automotive experts have put together the following information about the P0633 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 P0633 code.

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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