there is a tsb for passenger seat wiring harness chaffing....this can bring down the bus. inspect the wiring. if you find nothing i will check into diagnostics tonight.

 

post the engine size
u151b bcm lin b1 lost com with sunroof control module. Can't see this causing a no crank concern as the lin bus should not effect the other bus lines. Does the sunroof work?

u0121 Bcm lost comm with EBCM.
go in with your scan tool and see if you can view ebcm data. If not...check power and grd to the ebcm.

 

When you said funky stuff going on that tells me you have a bad ground a computer cannot think with a bad ground check your ground you have several cab to frame battery to frame there are several on the vehicle but check the battery ground to the battery the ground to the frame to ground to the engine you have a ground problem guaranteed

 

When you said funky stuff going on that tells me you have a bad ground a computer cannot think with a bad ground check your ground you have several cab to frame battery to frame there are several on the vehicle but check the battery ground to the battery the ground to the frame to ground to the engine you have a ground problem guaranteed