I have a 2012 Chevy 3500HD with the LGH. This is a farm truck with no emissions requirements here in AZ so it is fully deleted legally. I just finished an engine swap because the crankshaft snapped on the original. I installed a fass lift pump to resolve a crank no start but it seems I have not isolated the issue. The engine cranks strong and fuel pressure builds in the high pressure rails. The only fault I can discern as a cause now is the "fuel pressure regulator 2 control circuit short to ground fault" shown in the obd2 scanner. However, the fuel regulators on the CP4 pump and fuel driver side fuel rail are new. Batteries are new with full charge. I thought I'd post here for some suggestions before paying an arm and leg for a diesel shop.