4 fault codes, in safe mode

[Dcassells]

HI, yesterday when I went to turn my v2004 v70 2.5t back on my car went into safe mode (drives only in low gear, no spedometer, no signals etc) and came back with these 4 fault codes
U0073 Control module communication bus off
P0571 brake switch a circuit
P0503 vehicle speed sensor a intermittent erratic high
P0863 tcm communication circuit

About a week ago I had a new rad put in and for the last few months I've been having problems with the abs brakes coming on at random times while driving around 80km/h (I think it was the brakes coming on for a second, best i can describe it would be that it felt like a big jolt) usually when I've been driving awhile or its really hot out (don't know if that makes a difference..) any help or suggestions would be appreciated I live 3 hours from the closest volvo dealership and with the car in safe mode I have no signal lights. Thanks for any help