
❑Gasoline Engine: Replace engine air cleaner filter.
Diesel Engine: Inspect engine air cleaner filter
change indicator. If necessary, replace the filter. If
vehicle is driven in dusty/dirty conditions, inspect filter
change indicator at every engine oil change. See
Engine Air Cleaner/Filter on page 5-30for more
information.† (3)
❑DURAMAX™ Diesel Only: Replace fuel filter.
❑Chassis lubrication service (or every 6 months,
whichever occurs first).(12)
❑Cooling system service. Clean the cooling system
filler cap with clean water, clean the core, pressure
test the cap and the system for proper pressure
capability and inspect condition of cooling and heater
hoses and clamps. Replace hoses if cracked,
swollen or damaged.
❑Wheel bearing (grease type) service (or every
24 months, whichever occurs first, and whenever
hubs are removed).(23) (46)
❑Replace fuel filter(s) (or every 12 months, whichever
occurs first).(3)
❑Steering system service.(13)
❑Front and rear suspension service.(14)
❑Spring-to-axle U-bolts and shackle bolts service.(16)
❑Exhaust system service (or every 6 months,
whichever occurs first).(3) (4) (17)❑Inspect door hinge pins and bushings and replace as
necessary.
❑Wheels and tires service.(15)
❑Hydraulic brake service (or every 6 months,
whichever occurs first).(7) (46)
❑Parking brake service (or every 6 months, whichever
occurs first).(8)
❑Air brake service (or every 6 months, whichever
occurs first).(39)
❑Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first).(40)
❑Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours, whichever
occurs first).
❑Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first). Lubricate
linkage.
❑Air brake chamber service (or every 2 months,
whichever occurs first).(41)
❑Trailer brake hand control valve service (or every
3 months, or every 900 hours, whichever occurs
first).(42)
❑C600, C700 and C800 Gasoline Engines Only:
Engine drive belts service (or every 12 months,
whichever occurs first).(18)
6-16

Compact Disc Messages..................................3-56
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-35
Heater, Engine............................................2-23
Low Warning Light.......................................3-36
Surge Tank Pressure Cap.............................5-35
Cooling System..............................................5-38
Cooling System Capacity.................................5-94
Cruise Control................................................3-10
Current and Past Model Order Forms.................. 7-8
Customer Assistance Information
Customer Assistance for Text Telephone
(TTY) Users.............................................. 7-3
Customer Assistance Offices........................... 7-3
Customer Satisfaction Procedure..................... 7-2
Reporting Safety Defects to General Motors...... 7-7
Reporting Safety Defects to the Canadian
Government.............................................. 7-7
Reporting Safety Defects to the United
States Government.................................... 7-6
Roadside Assistance Program......................... 7-4
Service Publications Ordering Information......... 7-7
D
Daytime Running Lamps..................................3-14
Daytime Running Lamps Indicator Light.............3-41
Defensive Driving............................................. 4-2Defogging and Defrosting.................................3-20
Defroster Check..............................................6-27
Diesel Engine
Exhaust Brake............................................2-25
Fuel............................................................ 5-8
Starting......................................................2-14
Starting Your DURAMAX™...........................2-19
Diesel Engine Warm-Up...................................2-16
Differential Lock Control, Inter-Axle....................4-10
Differential Lock Control, Rear Axle...................4-10
Differential Lock Indicator Light.........................3-40
Doing Your Own Service Work........................... 5-4
Dome Lamps.................................................3-15
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7
Door Latches Check........................................6-27
Double-Clutching.............................................2-30
Driver
Position, Safety Belt.....................................1-13
Driving
At Night.....................................................4-17
City...........................................................4-21
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-22
Hill and Mountain Roads..............................4-23
In Rain and on Wet Roads...........................4-18
Winter........................................................4-25
4

Driving on Snow or Ice....................................4-26
Driving Through Deep Standing Water...............4-20
Driving Through Flowing Water.........................4-20
Dual Tire Operation.........................................5-69
E
Eaton®Fuller®Five and Six-Speed
Transmissions and TTC Spicer Seven-Speed
Transmissions.............................................2-30
Eaton
®Fuller®Nine and Ten-Speed
Non-Synchronized Manual Transmissions........2-32
Electric Air Compressor...................................5-51
Electrical Connections......................................4-36
Electrical System
Add-On Equipment......................................5-86
Fuses and Circuit Breakers...........................5-87
Fusible Links..............................................5-87
Headlamp Wiring.........................................5-86
Power Windows and Other Power Options......5-87
Windshield Wiper Fuses...............................5-87
Elevated Idle/Exhaust Restrictor........................2-21
Engine
Air Cleaner/Filter.........................................5-30
Battery.......................................................5-55
Change Engine Oil Light...............................3-39
Check and Service Engine Soon Light............3-37Engine (cont.)
Checks Before Operating..............................2-22
Coolant..............................................5-32, 5-35
Coolant Heater............................................2-23
Coolant Temperature Gage...........................3-35
Diesel Engine Exhaust Brake........................2-25
Drive Belt Routing......................................5-103
Exhaust.....................................................2-37
Fan Noise..................................................5-43
Oil .....................................................5-20, 5-25
Overheating................................................5-36
Overspeed Warning Light..............................3-39
Reduced Power Light...................................3-41
Shutdown Warning Light...............................3-39
Starting Your Diesel.....................................2-14
Starting Your DURAMAX™ Diesel..................2-19
Starting Your Gasoline..................................2-12
Engine Alarm and Automatic Shutdown..............2-16
Engine Coolant Level Check.............................6-24
Engine Cooling System Service........................6-26
Engine Cover Check.......................................6-28
Engine Oil Additives................................5-23, 5-29
Engine Oil Level Check...................................6-24
Engine Road Speed Governor..........................3-25
Engine Speed Limiting.....................................3-25
Engine Starter Over-Crank Protection.................2-12
Event Data Records (EDR)................................ 7-5
Exhaust Brake Indicator Light...........................3-40
5

Exhaust Restrictor (Diesel Engines)...................2-18
Exhaust System Check....................................6-27
Express-Down Feature.....................................2-10
Extender, Safety Belt.......................................1-26
Exterior Lamps...............................................3-13
F
Filter
Engine Air Cleaner......................................5-30
Filter Minder Gage..........................................3-44
Finding a Station............................3-46, 3-49, 3-53
Finish Care....................................................5-80
Finish Damage...............................................5-83
Fixed Mast Antenna........................................3-59
Flat Tire........................................................5-75
Flat Tire, Changing.........................................5-76
Fluid
Automatic Transmission................................5-31
Manual Transmission....................................5-32
Power Steering...........................................5-43
Windshield Washer......................................5-44
Fluid Leaks Check..........................................6-28
FM ...............................................................3-57
Folding the Rear Seat (Crew Cab).................... 1-7
Footnotes......................................................6-19
Fore-and-Aft Adjustment.................................... 1-4Four-Wheel and Six-Wheel Drum Brakes
(Air Only)...................................................5-49
Four-Wheel Disc Brakes
(Hydraulic Only)..........................................5-49
Front Wheel Bearings with Oil-Filled Hubs..........5-67
Fuel............................................................... 5-6
Additives...................................................... 5-7
Diesel Engine Fuel........................................ 5-8
Filling a Portable Fuel Container....................5-18
Filling Your Tank..........................................5-17
Filter..........................................................5-64
Filter Replacement.......................................5-15
Fuels in Foreign Countries............................5-16
Gage.........................................................3-42
Gasoline Octane........................................... 5-6
Gasoline Specifications.................................. 5-6
Primary Filter and Water Separator................5-65
Running Out of Fuel....................................5-15
Secondary Filter and Water Separator/Heater....5-66
Very Cold Weather Operation........................5-10
Water in Fuel..............................................5-10
Water in Warning Light.................................3-43
What Fuel to Use.......................................... 5-8
Fuel Filter (Diesel Engines)..............................5-65
Fuel Filter (Gasoline Engines)...........................5-64
Fuel Priming..................................................5-13
Fuses
Fuses and Circuit Breakers...........................5-87
Windshield Wiper.........................................5-87
6

Matching Transmitter(s) to Your Vehicle............... 2-5
Mexico, Central America and Caribbean
Islands/Countries (Except Puerto Rico and
U.S. Virgin Islands)....................................... 7-4
Mirrors
Manual Rearview Mirror................................2-39
Outside Convex Mirrors................................2-40
Outside Heated Mirrors................................2-41
Outside Manual Mirrors................................2-39
Outside Power Mirrors..................................2-40
Mirrors and Sun Visors Check..........................6-27
Model Reference................................................ vi
Moisture Ejector..............................................5-50
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-11
Noise Control System, Tampering......................5-62
Normal Maintenance Replacement Parts...........5-100
O
Odometer......................................................3-25
Off-Road Recovery..........................................4-14Oil
Change Engine Oil Light...............................3-39
Engine...............................................5-20, 5-25
Low Oil Level Light......................................3-38
Pressure Gage............................................3-37
Older Children, Restraints................................1-27
Online Owner Center........................................ 7-3
Other Service Items
Air Conditioning System...............................5-67
Automatic Ether Injection System...................5-66
Front Wheel Bearings with Oil-Filled Hubs.......5-67
Fuel Filter...................................................5-64
Primary Fuel Filter and Water Separator.........5-65
Secondary Fuel Filter and Water Separator/
Heater....................................................5-66
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-22
Outside
Convex Mirrors............................................2-40
Heated Mirrors............................................2-41
Manual Mirrors............................................2-39
Power Mirrors.............................................2-40
Overdrive Defeat.............................................2-29
Overspeed Warning Light.................................3-39
Owners, Canadian............................................... ii
Owner’s Information.......................................... 7-8
10

Storage Areas................................................2-41
Center Console Storage Area........................2-42
Stuck in Sand, Mud, Ice or Snow......................4-29
Sun Visors.....................................................2-10
Switchbanks, Instrument Panel..........................3-16
T
Tachometer....................................................3-26
Theft-Deterrent, Radio.....................................3-57
Theft-Deterrent Systems...................................2-10
Tilt Wheel........................................................ 3-7
Tire Inflation Check.........................................6-24
Tires.....................................................5-68, 5-82
Changing a Flat Tire....................................5-76
Dual Tire Operation.....................................5-69
If a Tire Goes Flat.......................................5-75
Inflation - Tire Pressure................................5-68
Rims and Wheels........................................5-69
Tightening the Wheel Nuts............................5-71
Wheel Alignment and Tire Balance.................5-70
Wheel Replacement.....................................5-74
When It Is Time for New Tires......................5-70
To Use the Engine Coolant Heater....................2-24
Top Strap......................................................1-38
Towing
Power Take-Off (PTO)..................................4-36
Your Vehicle...............................................4-31Traction
Control System (TCS)..................................4-11
Tractor Protection (Breakaway) Valve Check.......6-28
Trailer
Connections................................................4-35
Trailer Brake Hand Control Valve........................ 4-9
Trailer Connections
(C7/C8 Models Only)...................................4-36
Transmission
Fluid, Automatic...........................................5-31
Fluid, Manual..............................................5-32
Service Warning Light..................................3-31
Temperature Gage.......................................3-40
Transmission Fluid Capacity.............................5-98
Transmission Operation, Automatic....................2-28
Transmission Operation, Manual........................2-30
Trip Odometer................................................3-25
Turn and Lane-Change Signals.......................... 3-8
Turn Signal/Multifunction Lever........................... 3-7
Two-Speed Rear Axle......................................2-33
Two-Speed Rear Axle Electric Shift Control.........2-26
U
Underbody Flushing Service.............................6-28
Underbody Inspection......................................6-28
Underhood Fuse Block....................................5-91
Understanding Radio Reception........................3-57
14