the security light is on and my abc light is flashing? on 1998 Chevrolet S10

I looked up the causses for the security light on my truck it crankes and runs fine and I have been using th same key for as long as I owned the truck. any sogestion and I am not shur y my abc light is flashing? what is th abc light mean and y could it be flashing?

Asked by for the 1998 Chevrolet S10