The dashboard symbol with an exclamation point in the cutaway of a tire is the tire pressure monitoring system indicator. This dashboard symbol signals that one or more tires is low on air, or that the system needs resetting — especially if the tires have been serviced recently.
It is normal for tires to deflate in colder weather, as cold air is denser, which causes a reduction in the air pressure in a tire. A tire-pressure-monitoring system indicator that is on is not unusual after the cold months of winter in some areas. If only one tire is low on air, it may need replacing.