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the U0404 is a common problem in older jeeps it is "implausible data from shifter module ,also known as the ESM) this is an internal failure with the electronic shifter module NEVER a wiring issue of any kind, the only permanent fix is replace either the shifter OR the shifter bezel, that is where the ESM or shifter module is located, on single speed transfer cases you USED TO be able get the module only BUT on transfer cases with a shift lever you must replace the entire shifter, also on2 wheel drive you must replace the entire shifter.
as for the power outlets that is a completely different problem and can be a fuse or wiring there are 3 fuse boxes on the commander and its cousin the grand Cherokee so I will need your vin to pull the correct wiring to assist that problem.
and YES a failed shifter module WILL cause the truck not to start as it is a critical module in telling the jeeps computers it is safe to start