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Was the U0073 code the only one set?
The U0073 code is for a loss of communication with the vehicle dynamics (ABS) module, have you had any work done on your truck recently where they would have had the cab off?
U codes are network codes, the ABS system would have no effect on starting, however if one of the EGT sensors is going bad it would cause a no start, and the code would be erased if the battery was disconnected .
I would start by checking all the major connectors on the left inner fender well, it sounds like one of them may be not plugged in all the way.