Recently purchased a 2021 Acadia and learned tonight (the hard way) that if you start your car, and run inside and accidentally leave your key fob there, your car will still be able to go into gear and allow you to drive off without your fob. When you reach your destination and turn your car off you will be stranded. 😔 My husband's Ford will not allow you to put the car in gear if the fob is not nearby. This is a terrible safety feature, imo. A+ for Ford. Big fail for GMC.