Awhile back my 2000 Z28 had a no crank symtom. I diagnosed and replaced the Body Control Module. It fixed the no crank symtom, yea! Of course, afterwards, my key fobs didn't work and the Security lite was flashing. I was working regularly back then and had not discovered this forum. I took it to a dealer for the cat "recall" and asked them to program the fobs in. They did and they work but the Security lite is still flashing. Any ideas??

 

I had this problem but it just started flashing one day. I unplugged the shock sensor (its where the spare tire is) atleast in a 97. i left it unplugged for 4 hours. then plugged it back in and it went away. try that if ya want.