Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry your having this problem'was the new BCM programmed to the trucks vin number with a programming scan tool and the software installed in it ?
so now the BCM communicates ?
does it physically crank over and just not fire up now ?
key ON the check engine light is lit up the dash ?
Just a thought. Was the truck jump started and by chance even for a second did the jumper cables get put on backwards? If so then I would say replace the under hood fuse box if not try removing the under hood box and spraying out all the connectors with contact spray and then apply di-electric grease and see what happens. Good luck hope this helps I was just reading through and had this thought.