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Hi guys anyone point me in the right direction, I've got No communication with dsc module after an engine rebuild on my 2011 lci e91 318d n47

The engine will crank but not start, I've checked the fuses behind the glovebox, all seems good, they don't seem to be the same ones as mentioned in a Google search but the ones that are there all seem fine (checked with a multimeter in place).

Thinking it was fuel pressure issue I fired up insta and it came back with no communication with dsc or pdm

Besides a break in the pt-canbus is there anything I can check before shelling out for a new dcs module?

Is there any wiring I could have caught or crushed when getting the engine in or out?

Is there a way of testing the DSC module before I swap it out? A second hand one is only £20 on eBay but it needs coding right?

I'm fed up of this car now pretty much everything has been replaced on it at some point, never had such an unreliable car.