Security light

2003 CADILLAC CTS
19,600 MILES • 0.6L • 6 CYL • 2WD • AUTOMATIC
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WBAXTER56
  • MEMBER
  • 1 POST
When I attempt to start my Cadillac the icon comes on the dashboard with a lock and a key symbol stays on for a few seconds and then it goes off but the car still will not start up, I purchased a new battery and new alternator a new relay switch and a new fuel pump. Please help
Dec 3, 2018 at 12:57 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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WILLIAM CRABTREE
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 95 POSTS
Hello,

Do you have another key for this car? If so, I would suggest trying it. The transponder key system is not recognizing the key, and that is why your security light comes on.

The transponder system will immobilize the engine in two ways. First, If the system does not detect the proper programmed key, it will stop the fuel pump and will also take out the spark. Once the proper key is used, the car should start okay. If you do not have another key, I would suggest calling a locksmith or the dealership.

Let me know if I can be of any more help!

William
Dec 4, 2018 at 7:31 PM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
Here is a guide that can help you reset the system:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.

Cheers, Ken

Dec 5, 2018 at 12:56 PM