What does P0633 mean?

This code indicates that the immobilizer system code has not been programmed into the ECM/PCM. The vehicle may not start without this code.

• Immobilizer code not programmed after module replacement
• Incorrect code programmed
• Fault in the immobilizer system or PCM

Click steps to track your progress.

1. 1

   Program the correct immobilizer code into the ECM/PCM.

2. 2

   Ensure the immobilizer code is accurate.

3. 3

   Use the correct programming tools and procedures.

4. 4

   Contact a qualified automotive locksmith or dealer.