To maintain the 12 V battery and to allow the battery cooling system to come on if necessary, I would leave it plugged in if it’s possible; just be advised that after 48 hours or so if there’s no contact through the Onstar system that system will go to sleep, and you have to actually restart the car in order to wake it up. Just so you know if you’re trying to make contact with the car through Onstar and it goes into hibernation mode, you’re not going to be able to do that until you get back and restart it.
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