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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.
Tire Pressure Monitor System
The Tire Pressure Monitor System (TPMS) is designed
to monitor the amount of pressure in your vehicle’s
tires using radio and sensor technology. A TPMS
sensor, mounted onto the vehicle’s full-size tire and
wheel assembly, transmits tire pressure readings to a
receiver located in the vehicle. The compact spare
tire and wheel does not have a TPMS sensor.
Tire pressure status and tire pressure warnings are
shown on the Driver Information Center (DIC) display.
For additional information and details about the DIC
operation and displays see DIC Controls and Displays
on page 3-72 and DIC Warnings and Messages on
page 3-76.
If a low tire pressure condition is detected, the TPMS
will display the CHECK TIRE PRESSURE warning
message on the DIC and, at the same time, illuminate
the low tire pressure warning symbol, on the instrument
panel cluster.
You may notice, during cooler weather conditions, that
the low tire pressure warning symbol and the CHECK
TIRE PRESSURE message will display when the vehicle
is first started and then turn off as you start to drive
the vehicle. This could be an early indicator that the tire
pressures are getting low and need to be checked
and inflated to the proper pressure.
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