I bet someone unplugged (or forgot to plug in) the speaker. When I was getting my firmware updated, the tech forgot that during reassembly and obviously it doesn't make sound when the speaker isn't plugged in.
IIRC, the speaker is taped to the bottom of the carbon tank cover, near the J1772 plug. Pull the main tank cover off, then the carbon bit. The carbon bit should be held back by the speaker wire. If it's unplugged, you'll know right away because you'll be able to pull it all the way off the bike.