This was an tremendous opening for team Connor to exploit when dealing with metal. If CroMo's head could communicate with it's chassis, it had to be by radio link, right? And Vic's chip was trying to reach the internet via John's cell phone (either WiFi or Bluetooth would work).

There should have been an episode where John Connor hacked that channel.

Of course, CroMo's body should have been running into things, or tapping a white cane or something: no vision in the chassis. Comic relief?