2004 Silverado 1500 5.3L Cranks over but won’t start. Please help!

Thumopolis

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Truck died while driving… now it will only turn over but will not start. no check engine lights at all and only code when scanned was U1000 (no communication to module) z n I’m 100% certain it’s not a fuel issue, checked everything and yes I tied starting fluid as well. I have checked every fuse and relay and have removed/inspected/cleaned/replaced EVERY single ground as well as the plugs and coils. Coolant temp sensor working as it should. I have also tested cam and crank sensor wiring and everything is as should be. Other things that probably don’t have anything to do with the issue but I’ll list just in case… new battery, alternator is working fine, new sending unit, checked wiring in steering column and wiring under dash including radio and hvac panel. Please help, ANY ideas will be greatly appreciated. Thank you
 

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