Antitheft System light flashing and I cannot turn the key?
2001 GMC TRUCK
288,398 MILES
DESTINY SIOUX HOLIDAY
MEMBER
1 POST
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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
AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 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: