No crank no start U0100 Code?

Hello, with no check engine light and no comms, I would start by checking all your fuses and then if all ok, next would be powers and grounds at the PCM if nothing stands out during a visual inspection, ie corroded connectors, bad engine/body grounds, etc. Service info has you checking powers and grounds first thing as well, I will post that for you. Are you comfortable with testing wires and have a multimeter and test light?

Here are some guides to help with checking the fuses with a test light if needed. Start with the fuses first, noting any you find that are open circuit (blown fuse).

https://2carpros.com/articles/how-to-use-a-test-light-circuit-tester/

https://2carpros.com/articles/how-to-check-a-car-fuse/

https://2carpros.com/articles/how-to-use-a-voltmeter/

Here is some service info relating to the U0100 code, notice the U0100 code has to do with Battery power missing. Things such as short to ground (which will pop a fuse), open circuit (meaning the wire is cut in half, or high resistance from poor connections or corrosion. Let us know what you find, we can proceed from there.