JBE is part of the body control module in front foot well, might just be down to flat battery or fault with battery cables ,, the rest of it could also be that as well,,, if voltages drop below 12v on cranking the ecu's will not talk to each other and will shut down,, need a known good battery ie most AGM lasts 5-8 years tops and must also be coded to car ecu as well,, then reset the codes see whats left if any,, or could put battery charger on it over night leave it on the car while running resets and diagnostics so has stable voltage,,, need to do this reset it and then try to restart it see what comes back