Originally Posted by OnStar Advisor
Yes, the FamilyLink also connects through the vehicle system so if the car has gone into sleep mode then the only way to reconnect would be to restart the vehicle.
-Jessica, OnStar Advisor
Social Media Group
Guess I'm just going to have to be patient and wait the old fashioned way - hopefully they'll revive the system when they unload the car from the train. Any day now!