I am currently in the process of tuning and trying to start my newest build. It is a 2004 Silverado 5speed manual with a 2002 lq4. I?ve got a few question about getting it to start. It has the stock computer, which ran a v6. I have reflashed it to run the 6.0 with a stock 4.8 and 5 speed combo. This changed the the tune so the vin on the pcm doesn?t match the vin on the truck and bcm. I?ve disabled vats. I can?t get the engine to crank. The fuel pump primes, I?ve tested the clutch position switch. So I?ve determined that it?s got to be something wrong with the starting circuit.
1. Do the bcm and pcm have to have the same vin even with vats disabled? I?ve tried to simply change the vin with the vin wizard tool and it wants me to license the new vin( the old vin on the new tune) but I?ve already licensed both the pcm and tune. A total of 4 credits.

Any help would be greatly appreciated. Feel free to ask any clarifying questions. Thank you!!!