Theft lock preventing vehicle from starting

1999 GMC SIERRA
120,000 MILES • 4WD • AUTOMATIC
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KRISTYN NORDICK
  • MEMBER
  • 4 POSTS
I lost my keys so somebody tried to fix it and did not know what they were doing and ended up braking some parts. So I bought a new ignition at the junk yard and installed it and now the cars security lock has need activated and I cannot start my vehicle. Is there any way to bypass this theft lock?
Oct 22, 2018 at 9:57 AM
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DANNY L
  • ✓Experienced Mechanic
  • 5,648 POSTS
Hello, I am Danny.

I have attached a tutorial showing you an Anti-Theft relearn procedure. If this does not work keep us informed. Hope this helps and thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/how-to-reset-a-security-system
Oct 23, 2018 at 8:16 PM
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