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P0633 Powertrain

Immobiliser Key Not Programmed

The immobiliser system rejects the current key because it is not programmed to this vehicle. Engine start is inhibited.

Affected components

  • Immobiliser
  • Ecm

Common causes

  • High likelihood: Key not programmed to vehicle
  • Low likelihood: Immobiliser module fault

Possible symptoms

  • Check engine light on
  • Possible limp mode or no-start
  • Multiple follow-up faults across modules
  • Reset/relearn may be needed after repair

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • Reduced-power or limp mode may occur

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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