Antitheft System light flashing and I cannot turn the key?
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
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: