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P0633 GMC Code - Immobilizer Key Not Programmed

- Code Popularity: 7,666 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0633 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Immobilizer Key not programmed to the vehicle
  • Faulty Immobilizer Key
  • Faulty ignition switch
⚠ Does your GMC have Safety Recalls? → Check here

How to Fix the DTC P0633 GMC?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

DTC P0633 will clear upon a successful engine start. Any malfunction that will cause a no-start condition will prevent DTC P0633 from clearing. Prior to diagnosing DTC P0633, ensure that all power moving, and engine control systems are operating properly and all conditions that may cause a no-start have been corrected. Do not replace the Engine Control Module (ECM). Replacing the Engine Control Module will not correct the no-start condition.





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0633 GMC code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • No or hard engine start situation

Code P0633 GMC Description

When learning the immobilizer data, as well as the challenge and response sequence, the Engine Control Module (ECM) is placed in learn mode. The Diagnostic Trouble Code (DTC) P0633 will be set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the immobilizer data and challenge/response are learned, learn mode will be exited when the engine is successfully started. If the ECM does not exit learn mode, the DTC P0633 will remain current and indicate a fault.

OBDII Code P0633 GMC - Immobilizer Key Not Programmed - AutoCodes.com
P0633 GMC Code - Immobilizer Key Not Programmed

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Code P0633 GMC comments

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