Will the vehicle shut off if I walk away from the iTag?

No, for safety reasons, once the key fob has authorized the ignition the vehicle will not shut off or re-arm (the System will Re-arm 30 seconds after shutting the system off). IE; if your key fob battery died or a child threw your key fob out the window (we’ve heard it all) the vehicle will still continue to run until you decide to shut the engine down.