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2015 2500hd 6.0, no crank, no start!!!

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Hello all, like many others, I'm fighting a no crank, no start issue. I had no gauges, and a bunch of MIL's. I replaced my ECM with a reman from flagship one, and got my gauges back, and all MIL's went away except "service 4wd". However, I still don't have power to post 85 on the starter relay when cranking. I can make the starter crank when I jump the relay. I have a good signal from the transmission to the ecm when in park, and the high-speed gmlan seems to be OK. Anyone have any ideas? I'm at a loss!!!!

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