Can you disarm the antitheft system
How to rear my antitheft system
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If you mean resetting the factory anti-theft system, try pressing Unlock on your key fob or starting the truck with the correct key. If it won't start and the SECURITY light stays on or flashes, the fix depends on the model year and the type of security system. What year is your Sierra, and is the alarm going off, or does the engine crank but not start?
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See my comment, it starts fine. But the horn wont sound when the system is activated
