I had an OBDII BT adapter plugged into my 2013 Volt from day one. It is plugged in all the time. The only time I unplug is when I give it for service, or when I need OnStar to run remote diagnostics on demand (they will not be able to connect for on-demand Remote Diagnostics if the OBD2 port on drivers side is plugged in). OnStar remote link web/app works fine (remote start/stop, vehicle location, charge status, etc)