Antitheft System light flashing and I cannot turn the key?

Tiny
DESTINY SIOUX HOLIDAY
  • MEMBER
  • 2001 GMC TRUCK
  • 288,398 MILES
Antitheft light is flashing and I am not able to turn the key over, also because it's locked.
Monday, August 8th, 2022 AT 2:34 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
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.
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Monday, August 8th, 2022 AT 2:23 PM

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