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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.
Re-check 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.
Your vehicle has a Tire Pressure Monitor
System (TPMS) that sends tire pressure
information to the Driver Information Center (DIC).
Using the DIC control buttons, the driver is able
to check tire pressure levels in all four road
tires. See Tire Pressure Monitor System on
page 406 and DIC Controls and Displays on
page 233 for additional information.
Professional Vehicle
The proper inflation of the tires on your professional
vehicle depends on the type of tires on it.
• If your vehicle has P235/60R17 size tires, the
cold inflation pressure is 41 psi (284 kPa).
• If your vehicle has LT235/60R17E size tires,
the cold inflation pressure depends on the
vehicle mass and should be determined by the
vehicle coach-builder. A tire and loading
information label provided by the final stage
manufacturer should be attached to the
B-pillar on the driver’s side of the vehicle.
If the final stage manufacturer’s label is not
present, the coach-builder should be consulted.
Do not use the tire pressures indicated on the
General Motors label. These tire pressures
are for the incomplete vehicle and are not the
correct tire pressures for the completed
professional vehicle.
Operation at inflation pressures below this
recommendation may cause your tires to become
overloaded.
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