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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 are
under-inflated. 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.
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.
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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