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Check the left side of the engine for a wire rubbed through right next to the EGR tube. We see the engine harness rub through right there fairly often. It usually shorts out the PCM voltage feed or cuts the crank sensor signal.
If that's not the case then I would start pulling the connectors at the PCM and checking for signs of corrosion. Then plug them back in and see if anything changes on whether it will start or communicate with the scan tool.
It could be any of these fuses:
The PCM is on the driver's side firewall- kind of next to the brake booster.
Either a just bad fuse, or the red wire running from the fuse box to the PCM rubbed through somewhere. That harness by the EGR valve is the most likely place.
Let me know if you need additional info.
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