Truck is a 98 Chevy k1500 it starts an dies any advice

Question

My 98 Chevy is throwing a p1626 code I have replaced the pcm an the ignition module an the vehicle anti theft module trued the relearn procedure three different ways with no luck would a faulty bcm cause this problem an if so where is it located

Answer 1

At the dash area on the left side back of the firewall