Right now, any car that has an internet connection to the entertainment system and has the entertainment system connected to the CAN Buss has the potential for hacking.
CAN was designed before the internet and has no security system in place.
IMHO, no one should buy a car with this kind of connectivity until the system until the CAN system is firewalled from any internet connectivity.
There was sirus radio in my car, but I did not renew it but I cannot get it turned off.
There is also a road mapping system and that wont turn off either.