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9. TOW/HAUL Indicator Light – If EquippedThe TOW HAUL button is located on the
center stack switch bank. This light will illumi-
nate when TOW HAUL mode is selected
10. Exhaust Brake Indicator Light
This light will illuminate when the exhaust brake has
been turned on.
11. Oil Pressure Gauge
The pointer should always indicate some oil pressure
when the engine is running. A continuous high or low
reading under normal driving conditions may indicate a
lubrication system malfunction. Immediate service
should be obtained from an authorized dealer.
12. Odometer/Trip Odometer Button
Press this button to toggle between the odometer and the
trip odometer display. Holding the button in resets the
trip odometer reading when in trip mode. 13. Odometer/Electronic Vehicle Information Center
(EVIC) Display
Odometer
The odometer shows the total distance the vehicle has
been driven. U.S. federal regulations require that upon
transfer of vehicle ownership, the seller certify to the
purchaser the correct mileage that the vehicle has been
driven. Therefore, if the odometer reading is changed
during repair or replacement, be sure to keep a record of
the reading before and after the service so that the correct
mileage can be determined.
The two trip odometers show individual trip mileage. To
switch from odometer to trip odometers, press and
release the TRIP ODOMETER button.
To reset a trip odometer, display the desired trip odom-
eter to be reset then push and hold the button for
approximately two seconds until the display resets.
3
UNDERSTANDING YOUR INSTRUMENT PANEL 13 
     
        
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3. Turn the ignition switch to the OFF position.
NOTE:If the indicator message illuminates when you
start the engine, the oil change indicator system did not
reset. If necessary, repeat these steps.
Diesel Exhaust Fluid (DEF) Warning Messages –
Chassis Cab Only
Your vehicle will begin displaying warning messages
when the DEF level reaches a driving range of approxi-
mately 1,000 miles (1 609 km). If the following warning
message sequence is ignored, your vehicle will not start
unless DEF is added.
•Low DEF Refill Soon – This message will display
when the low level is reached, during vehicle start up,
and with increased frequency during vehicle opera-
tion. It will be accompanied by a single chime. Ap-
proximately 6 gallons (23 Liters) of DEF is required to
refill the tank when this message is initially displayed.
•Refill DEF Engine Will Not Restart In XXX Miles –
This message will continuously display if the “Low
DEF Refill Soon” message is ignored, and the fre-
quency of occurance of the chime will increase unless
up to 2 gallons (7.5 Liters) of DEF is added to the tank.
The engine will not restart if the mileage counter
reaches zero.
•Refill DEF Engine Will Not Start – This message will
continuously display when the counter reaches zero,
and will be accompanied by a periodic chime. The
engine will not start after it has been turned off unless
up to 2 gallons (7.5 Liters) of DEF is added to the tank.
NOTE: A minimum of up to 2 gallons (7.5 Liters) may
be required to restart the vehicle. Although the vehicle
will continue to operate while this warning message is
initially displayed, the engine will not restart the next
time the vehicle is shut off.
28 UNDERSTANDING YOUR INSTRUMENT PANEL 
     
        
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Diesel Exhaust Fluid (DEF) Fault Warning
Messages – Chassis Cab Only
There are three different messages if the vehicle detects
that the DEF system has been filled with a fluid other
than DEF, component failures, or tampering has been
detected. The vehicle will not start if the DEF system is
not serviced within 750 miles (1 207 km) of the fault being
detected.
When the DEF system needs to be serviced the following
warnings will display:
•Service DEF System – See Dealer— This message
will display when the fault is initially detected, each
time the vehicle is started, and periodically during
driving. The message will be accompanied by a single
chime. We recommend you drive to your nearest
authorized dealer and have your vehicle serviced as
soon as possible.
•Service DEF System Engine Will Not Start In
500 Miles – See Dealer — This message will display if
the DEF system has not been serviced within 250 miles
after the “Service DEF System – See Dealer” message is
displayed. This message will continuously display
until the mileage counter reaches zero, and will be
accompanied by a periodic chime. The message will
continue to countdown until it reaches zero unless the
vehicle is serviced. We recommend you drive to your
nearest authorized dealer and have your vehicle ser-
viced immediately.
•Service DEF System Engine Will Not Start – See
Dealer — This message will continuously display
when the mileage counter reaches zero, and will be
accompanied by a periodic chime. The engine will not
restart after it has been turned off, your vehicle will
require towing, see your authorized dealer for service.
3
UNDERSTANDING YOUR INSTRUMENT PANEL 29 
     
        
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•Keep the front of the radiator clean. If your vehicle is
equipped with air conditioning, keep the front of the
condenser clean.
•Do not change the thermostat for Summer or Winter
operation. If replacement is ever necessary, install
ONLY the correct type thermostat. Other designs may
result in unsatisfactory cooling performance, poor gas
mileage, and increased emissions.
Charge Air Cooler – Inter-Cooler
The charge air cooler is positioned between the radiator
and the air conditioner condenser. Air enters the engine
through the air cleaner and passes through the turbo-
charger, where it is pressurized. This pressurized air
rapidly reaches high temperature. The air is then directed
through a hose to the charge air cooler and through
another hose to the intake manifold of the engine. The air
entering the engine has been cooled by about 50° to 100°F
(10° to 38°C). This cooling process enables more efficient
burning of fuel resulting in fewer emissions.To guarantee optimum performance of the system, keep
the surfaces of the charge air cooler, condenser and
radiator clean and free of debris. Periodically check the
hoses leading to and from the charge air cooler for cracks
or loose clamps resulting in loss of pressure and reduced
engine performance.
Brake System
Brake Master Cylinder – Brake Fluid Level Check
The fluid level of the master cylinder should be checked
when performing under the hood service, or immedi-
ately if the “Brake System Warning Light” indicates
system failure.
The brake master cylinder has a translucent plastic
reservoir. On the outboard side of the reservoir, there is a
“MAX” mark and an “MIN” mark. The fluid level must
be kept within these two marks. Do not add fluid above
the full mark because leakage may occur at the cap.
6
MAINTAINING YOUR VEHICLE 119 
     
        
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Maintenance Log and Service Chart (Diesel Engines)
Noise Systems Maintenance Chart and Service Log — Insert Month, Day, Year under column mileage closest to
the mileage at which service was performed.
MILES 7,500 15,000 22,500 30,000 37,500 45,000 52,500 60,000
KILOMETERS 12 000 24 000 36 000 48 000 60 000 72 000 84 000 96 000
Exhaust
system-inspect
Air cleaner
assembly-
inspect
ODOMETER
READING
PERFORMED
BY
PERFORMED
AT
128 MAINTAINING YOUR VEHICLE 
     
        
        Page 130 of 170
Noise Systems Maintenance Chart and Service Log — Insert Month, Day, Year under column mileage closest to
the mileage at which service was performed.
MILES 67,500 75,000 82,500 90,000 97,500 105,000 112,500 120,000
KILOMETERS 108 000 120 000 132 000 144 000 156 000 168 000 180 000 192 000
Exhaust
system-inspect
Air cleaner
assembly-
inspect
ODOMETER
READING
PERFORMED
BY
PERFORMED
AT
6
MAINTAINING YOUR VEHICLE 129