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, 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 closet volvo dealership and with the car in safe mode I have no signal lights.

 

Whenever I see communication faults I wonder if the battery has a decent amount of life. How old is the battery in the car?