I just bought a new 2011 Honda Fit and while driving it home from the dealer, I noticed that a little light on the dashboard was on that said "TPMS". When I got home, I consulted the owner's manual and learned that this acronym stands for "Tire Pressure Monitoring System", and that the light being on indicates that there is a problem with the system. (There is a different indicator that comes on if the pressure in a particular tire is low.)
The actual tire pressure was fine and there was nothing visibly wrong with the tires, so I called the dealer to ask about the indicator light and was told that it is fairly common for the TPMS sensors to malfunction in cold weather, in which case they just need to be reset by the dealer. I'm scheduled to take the car back to the dealer this week anyway to have some options installed, but since this is a brand new car that I'm most likely planning to keep for a very long time, I'm curious whether this really is a common and trivial issue or if it's something I should be concerned about and push to have fixed. I live in Colorado and while it was indeed chilly that day (I believe it was around 25-35F), it is certainly not unusual for it to be that cold or colder here many days per year.