My Volt told me by email its right rear tire had only 22 lb pressure this morning. I topped it up and brought it to the tire shop where they took a big screw out of it and repaired it. Is that ever a useful feature especially for a car without a spare. My car is an LT, a base Volt but the standard equipment is amazing. One year old and 12,000 miles by the end of the month. No problems.