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First off, there is a regen fault. That is why you have the code. I siggesy having the truck scanned to see what the exact fault code you have for the system you have.
The regen module could be draining the batteries down and causing both issues or you have a short to ground on the CAN BUS at the module causing the batteries to drain.
I know you don't want to take the truck to the dealer, but this case you will have to. With the dash not working as well, there is definitely a module and/or communication proglem on the CAN BUS. Only a scanner/laptop with the software will be able to locate which module is acting up.
I would also test the batteries just in case one is bad and causing that. If one has a dead cell, it will cause low voltage and then you will have the problems you have. Most likely a short to ground on the CAN BUS will be the cause.
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