I have a 2014 volt, lost my second fob) did the unlock part 5 times, I opened the door (with the original FOB) and saw the message "Ready for remote 3" right away. I inserted the new FOB, pressed START and immediately saw "Ready for remote 4", took out my new FOB, tested it and worked right away. No need to wait even a minute. BTW, I believe, both fobs were inside the vehicle when I did this. Thx for the video.
I tried that, but right at last step, after inserting old key, pressing start, asked for new key, put that in - it will open and lock doors , but for starting l- it says remote not detected