Hello I can help you with this. BH-33 is a source address for the Bulkhead module on a Freightliner M2. Every computer that talks to other computers on the truck communicates on what is called the J1939 backbone or datalink. Every computer has it's own mailing address so to speak so that messages go to the right computer. "33" is the Bulkhead's address. This just simply means that there is a fault code in the Bulkhead module but does not say what this fault code is. A software program called ServiceLink must be used to determine the fault. Since it will not start as well it likely to be a wiring fault such as "starter output failed to high side" or something that would affect the starting system. If you push and hold down the button on your instrument cluster you can go through a menu and retrieve the fault code usually. If not you will have to take it to a dealer to have ServiceLink pull it. The Bulkhead module controls the output to the starter to start the engine.
If you can retrieve the fault code I can help you a little further but with out a laptop being connected to the truck it will be tough.