Cranking the engine with low voltage may have locked the Dash or the VDC ( Vehicle Data Center a Freightliner name.) In a diagnostic mode. Is your coach on a Freightliner chassis ?
Disconnect all batteries, and shore power ,make sure all batteries are fully charged, then re-connect . With this kind of problem a full shut down is the first thing to try.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.