Tire Pressure Monitor System - GMC Yukon 2007 Owner's Manual

When to Check
Check your tires once a month or more. Do not
forget to check the spare tire. For additional
information regarding the spare tire, see Spare
Tire on page 554.
How to Check
Use a good quality pocket-type gage to check tire
pressure. You cannot tell if your tires are
properly inflated simply by looking at them. Radial
tires may look properly inflated even when
they're underinflated. Check the tire's inflation
pressure when the tires are cold. Cold means your
vehicle has been sitting for at least three hours
or driven no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage firmly onto the valve to
get a pressure measurement. If the cold tire
inflation pressure matches the recommended
pressure on the Tire and Loading Information
label, no further adjustment is necessary. If the
inflation pressure is low, add air until you reach the
recommended amount.
If you overfill the tire, release air by pushing on
the metal stem in the center of the tire valve.
Recheck the tire pressure with the tire gage.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.

Tire Pressure Monitor System

The Tire Pressure Monitor System (TPMS) uses
radio and sensor technology to check tire pressure
levels. If your vehicle has this feature, sensors are
mounted on each tire and wheel assembly, except
the spare tire. The TPMS sensors monitor the air
pressure in your vehicle's tires and transmit tire
pressure readings to a receiver located in the
vehicle.
The TPMS is designed to alert the driver, if a low
tire pressure condition exists. If your vehicle has the
Driver Information Center (DIC), the driver may also
check tire pressure levels using the DIC.
When a low tire pressure condition is detected, the
TPMS will illuminate the low tire pressure warning
symbol located on the instrument panel cluster. If
your vehicle has the DIC feature, a message to
check the pressure in a specific tire will also appear
on the DIC display.
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