antitheft wount let me do nothing and cant get it to reset
on 2004 Chevrolet Silverado 1500

wount even let the ob2 scan

Asked by for the 2004 Chevrolet Silverado 1500
I gather it won't start, correct.
Do you have AAA plus for towing? If not it only costs $99 for one year for four tows over 100 miles. Best money you will ever spend.
If not tow it to a PROFESSIONAL AUTO TECHNICIAN to diagnose the problem properly. You will not be able to scan the antitheft side of the PCM with just a OBDII code reader. If you don't you will spend a lot of money guessing.