P0633

2017-10-10

Description:

  • The fault code P0633 indicates that the engine control module (ECM) or powertrain control module (PCM) has detected a problem with the immobilizer key. This may prevent the vehicle from starting or cause it to run poorly.

Possible Symptoms:

  • Engine cranks but does not start

  • Engine starts but then immediately stalls

  • Illuminated security light on the dashboard

  • Reduced engine power or acceleration

  • Vehicle may go into "limp mode" to protect the engine from damage

Possible Causes:

  • Key not programmed or synced with the ECM or PCM

  • Faulty immobilizer control module

  • Faulty ECM or PCM

  • Malfunctioning key or key fob

Related Parts:

  • Immobilizer Circuit: An immobilizer stops the engine from working and prevents the car from being stolen. Problems with an immobilizer lead to car not unlocking

Possible Solutions:

  • Program or sync the key with the ECM or PCM

  • Replace the immobilizer control module if necessary

  • Replace the ECM or PCM if necessary

  • Replace the key or key fob if they are malfunctioning

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