Antitheft System light flashing and I cannot turn the key?

2001 GMC TRUCK
288,398 MILES
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DESTINY SIOUX HOLIDAY
  • MEMBER
  • 1 POST
Antitheft light is flashing and i am not able to turn the key over, also because it's locked.
Aug 8, 2022 at 2:34 AM
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STRAILER
  • ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
So, the ignition key will not turn at all, or it runs, and does nothing? Or is the security light flashing and so the truck will not start? If it is the latter, here is a guide so you can reset the system:

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

Let us know what happens and please upload pictures or videos of the problem.
Aug 8, 2022 at 2:23 PM
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