2003 GMC SIERRA DENALI automatic transmission

90,000 Miles (150 000 km)
0 Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
0 Replace fuel filter. An Emission Control Service. (See
Footnote
t.)
0 Replace engine air cleaner filter. An Emission
Control Service.
0 Rotate tires. See Tire Inspection and Rotation on
page 5-62
for proper rotation pattern and additional
information.
(See footnote +.)
97,500 Miles (162 500 km)
c[I Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
page 5-62 for proper rotation pattern and additional
information.
(See footnote +.)
0 Rotate tires. See Tire Inspection and Rotation on
100,000 Miles (166 000 km)
0 Inspect spark plug wires. An Emission Control
0 Replace spark plugs. An Emission Control Service.
Service.
0 Change automatic
transmission fluid and filter if the
vehicle
is mainly driven under one or more of these
conditions:
- In heavy city traffic where the outside
temperature regularly reaches
90°F (32°C) or
higher.
- In hilly or mountainous terrain.
- When doing frequent trailer towing.
- Uses such as found in taxi, police or delivery
service.
0 If you haven’t used your vehicle under severe service
conditions listed previously and, therefore, haven’t
changed your automatic transmission fluid, change
both the fluid and filter.
0 Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)
0 Drain, flush and refill cooling system (or every
60 months since last service, whichever occurs first).
See
Engine Coolant on page 5-24 for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test the cooling system
and pressure cap.
An Emission Control Service.
0 Inspect engine accessory drive belt. An Emission
Control Service.
6-9

At Least Twice a Year
Restraint System Check
Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors and anchorages
are working properly. Look for any other loose or
damaged safety belt system parts.
If you see anything
that might keep a safety belt system from doing its
job, have it repaired. Have any torn or frayed safety belts
replaced.
Also look for any opened or broken air bag coverings,
and have them repaired or replaced. (The air bag
system does not need regular maintenance.)
Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace
blade inserts that appear worn or damaged or that
streak or miss areas of the windshield.
Also see
Cleaning the Outside of Your Vehicle on page 5-88.
Spare Tire Check
At least twice a year, after the monthly inflation check of
the spare tire determines that the spare is inflated to
the correct tire inflation pressure, make sure that
the spare tire is stored securely. Push, pull, and then try
to rotate or turn the tire. If it moves, use the wheel
wrenchhatchet to tighten the cable. See
Changing a Flat
Tire on page 5-69.
Weatherstrip
Silicone grease on
longer, seal better,
Lubrication
weatherstrips will make them last
and not stick or squeak. Apply
silicone grease with a clean cloth. During very -cold,
damp weather more frequent application may be
required. See
Part D: Recommended Fluids and
lubricants on page
6- 16.
Automatic Transmission Check
Check the transmission fluid level; add if needed. See
Automatic Transmission Fluid on page 5-27. A fluid loss
may indicate a problem. Check the system and repair
if needed.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all body door hinges, hood latch assembly,
secondary latch, pivots, spring anchor, release
pawl, tailgate hinge, tailgate linkage, tailgate handle
pivot points, latch bolt, fuel door hinge, locks and folding
seat hardware. Part
D tells you what to use. More
frequent lubrication may be required when exposed to a
corrosive environment.
6-1 1

Starter Switch Check Automatic Transmission Shift Lock
Contr-l System Check
When you are doing this check, the vehicle
could move suddenly.
If it does, you or others
could be injured. Follow the steps below.
1
1.
2.
3.
Before you start, be sure you have enough room
around the vehicle.
Firmly apply both the parking brake and the regular
brake. See
Parking Brake on page 2-22 if
necessary.
Do not use the accelerator pedal, and be ready to
turn off the engine immediately
if it starts.
Try
to start the engine in each gear. The starter
should work only in PARK (P) or NEUTRAL
(N).
If the starter works in any other position, your
vehicle needs service.
I
_/hen you are doing _.. check, tl vel le
could move suddenly.
If it does, you or others
could be injured.
Follow the steps below.
I
1. Before you start, be sure you have enough room
around the vehicle. It should be parked on a level
surface.
2. Firmly apply the parking brake. See Parking Brake
on page 2-22 if necessary.
Be ready
to apply the regular brake immediately if
the vehicle begins to move.
3. With the engine off, turn the key to the RUN
position, but don’t start the engine. Without applying
the regular brake, try
to move the shift lever out
of PARK (P) with normal effort.
If the shift lever
moves out of PARK (P), your vehicle needs service.
6-1 2

Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition key to LOCK in each shift lever position.
* The key should turn to LOCK only when the
The key should come out only in LOCK.
shift lever
is in PARK (P).
Parking Brake and Automatic
Transmission Park (P) Mechanism
A. le1 , ..
When you are doing this check, your vehicle
could begin to move. You or others could be
injured and property could be damaged. Make
sure there
is room in front of your vehicle in
case it begins to roll. Be ready to apply the
regular brake at once should the vehicle begin
to move. Park on a
fairly steep hill, with the vehicle facing
downhill. Keeping your foot on the regular brake, set the
parking brake.
@ To check the parking brake’s holding ability: With
the engine running and transmission in
NEUTRAL
(N), slowly remove foot pressure from the regular
brake pedal.
Do this until the vehicle is held by the
parking brake only.
ability: With the engine running, shift to PARK (P).
Then release the parking brake followed by the
regular brake.
To check the PARK (P) mechanism’s holding
Underbody Flushing Service
At least every spring, use plain water to flush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
6-1 3

Part D: Recommended Fluids and
Lubricants
Fluids and lubricants identified below by name, part
number or specification may be obtained from your
dealer.
Engine Oil
Engine Coolant
Hydraulic Brake
System
Windshield
Washer Solvent
Power Steering
System
~~
Automatic
Transmission Fluid/Lubricant
Engine oil with the American
Petroleum Institute Certified for
Gasoline Engines starburst symbol
of the proper viscosity. To determine
the preferred viscosity for your
vehicle's engine, see
Engine Oil on
Daae
5- 13.
50/50 mixture of clean, drinkable
water and use only DEX-COOL
Coolant. See
Engine Coolant on
page
5-24.
Delco Supreme 11 Brake Fluid or
equivalent DOT-3 brake fluid.
GM Optikleen Washer Solvent or
equivalent.
GM Power Steering Fluid (GM Part
No.
U.S. 1052884, in Canada
993294, or equivalent).
DEXRON-Ill Automatic Transmission
Fluid. Usage
FluWLubricant
Multi-Purpose Lubricant, Superlube
Key Lock
Canada 10953474. or eauivalent). Cylinders (GM Part No. U.S. 12346241, in
Floor Shift
Linkage
Chassis
Lubrication Lubriplate
Lubricant Aerosol (GM
Part No.
US. 12346293, in Canada
' 992723, or equivalent) or lubricant
meeting requirements of NLGl #2
Category LB or GC-LB.
Chassis Lubricant (GM Part
No.
U.S. 12377985, in Canada
88901242, or equivalent) or lubricant
meeting requirements of NLGl #2,
Cateaow LB or GC-LB.
SAE 75W-90 Synthetic Axle
Lubricant (GM Part No.
U.S.
Front Axle 12378261, in Canada 10953455) or
equivalent meeting GM Specification
99861 15.
Synthetic Axle Lubricant; use only
Rear Axle
88901362).
Do not add friction
(Steerable) GM Part
No. 12378557
(in Canada
modifier.
Transfer Case
I Fluid.
DEXRON-Ill Automatic Transmission
Chassis Lubricant (GM Part No.
U.S. 12377985,
in Canada Rear Driveline
meeting requirements of NLGI #2, Center Spline 88901242, or equivalent) or lubricant
CateqorV LB or GC-LB.
6-1 6

Audio Systems (cont.)
XMTM Satellite Radio Antenna System ............ 3-84
Automatic Headlamp System
............................ 3-1 2
Operation ................................................... 2-1 8
System Check
......................................... 6-12
Automatic
Transmission
Fluid
.......................................................... 5-21
Automatic Transmission Check
.......................... 6-1 1
Automatic Transmission Shift Lock Control
B
Backing Up .................................................... 4-57
Battery
.......................................................... 5-42
Battery Replacement
......................................... 2-5
Battery Run-Down Protection ............................ 3-1 6
BATTERY NOT CHARGING
............................. 3-54
Battery Warning Light
...................................... 3-33
Before Leaving on a Long Trip
......................... 4-35
Body Lubrication Service
.................................. 6-1 1
Brake Parking
...................................................... 2-22
System Inspection
....................................... 6-1 5
System Warning Light .................................. 3-34
Brake Adjustment
............................................ 5-42
Brake Fluid
.................................................... 5-39
Brake Pedal Travel
......................................... 5-42
Brake Wear
.................................... ....... 5-41
Brakes
.......................................................... 5-39
Braking ........................................................... 4-6 Braking
in Emergencies
..................................... 4-8
Break-In, New Vehicle
..................................... 2-15
Bulb Replacement
........................................... 5-52
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp
............................................ 5-56
Front Turn Signal, Sidemarker and Daytime
Running Lamps
........................................ 5-53
Halogen Bulbs
............................................ 5-52
Headlamps
................................................. 5-52
Pickup Box Identification and Fender
Marker Lamps
......................................... 5-58
Replacement Bulbs
...................................... 5-59
Roof Marker Lamps
..................................... 5-54
Buying New Tires
........................................... 5-64
Taillamps
.................................................... 5-58
C
California Fuel .................................................. 5-6
Canada
........................................................... 7-4
Canadian Owners
................................................ ii
Canadian Roadside Assistance ........................... 7-7
Capacities and Specifications
.......................... 5-1 04
Car Washes for QUADRASTEERTM Equipped Vehicles
..................................................... 4-13
Carbon Monoxide
..................... 4-38, 4-51, 2-8, 2-26
Care of
Safety Belts
................................ ..... 5-88
Care
of Your
Cassette Tape Player
................................... 3-83
2

Fluid Automatic Transmission
................................ 5-21
Power Steering
........................................... 5-37
Windshield Washer
...................................... 5-38
FM Stereo
..................................................... 3-82
Fog Lamps
.................................................... 3-14
Folding the Rear Seat
....................................... 1-7
Following Distance
.......................................... 4-57
Footnotes
........................................................ 6-5
Front Axle
...................................................... 5-51
Front Reading Lamps
...................................... 3-15
Fuel
............................................................... 5-5
Additives ...................................................... 5-6
California Fuel
.............................................. 5-6
Filling a Portable Fuel Container
..................... 5-9
Filling Your Tank
........................................... 5-7
Fuels in Foreign Countries .............................. 5-7
Gage ......................................................... 3-42
Gasoline Octane
........................................... 5-5
Gasoline Specifications .................................. 5-5
Low Warning Light ....................................... 3-42
System Inspection
....................................... 6-14
Fuel Information Button
.................................... 3-46
FUEL LEVEL LOW
......................................... 3-58
Fuses Fuses and Circuit Breakers
........................... 5-95
Windshield Wiper ......................................... 5-95
G
Gage
Engine Coolant Temperature
......................... 3-36
Fuel
.......................................................... 3-42
Oil Pressure
........................................... 3-40
Speedometer
.......................................... 3-26
Tachometer
................................................. 3-26
Transmission Temperature
............................. 3-36
Voltmeter Gage
........................................... 3-33
Garage Door Opener
....................................... 2-35
Gasoline
Octane
.................................................... 5-5
Specifications
............................................... 5-5
Glass Surfaces ............................................... 5-88
Glove Box
..................................................... 2-39
GM Mobility Program for Persons with
Disabilities
.................................................... 7-5
Gate
Operator and Canadian Programming
........ 2-37
Hazard Warning Flashers
............................... 3-3
Head Restraints
............................................... 1-6
Headlamp High/Low Beam Changer
.................... 3-6
Headlamps
.................................................... 5-52
Bulb Replacement
....................................... 5-52
Front Turn Signal, Sidemarker and Daytime
Running Lamps
........................................ 5-53

OIL PRESSURE LOW ..................................... 3-54
Older Children. Restraints
................................ 1-30
Online Owner Center ........................................ 7-3
Onstar@ Personal Calling
................................. 2-34
Onstar@ Services
............................................ 2-33
Onstar@ Steering Wheel Controls
...................... 2-34
Onstar@ System
............................................. 2-33
Onstar@ Virtual Advisor
.................................... 2-34
Operating Your All-Wheel-Drive Vehicle
Off
Paved Roads ..................
Other Warning Devices ........
Outlet Adjustment ................
Outside
Automatic Dimming Mirror
.
Convex Mirror .................
Curb View Assist Mirrors ..
Heated Mirrors ................
Power Foldaway Mirrors ...
...
......................... 4-16
........................... 3-4
......................... 3-23
......................... 2-31
......................... 2-32
......................... 2-32
......................... 2-32
......................... 2-31
Power Mirrors
............................................. 2-31
Overheated Engine Protection
Operating Mode
.......................................... 5-27
Owners, Canadian
............................................... ii
Owner’s Information ........................................ 7-1 0
P
Park (P)
Parking Shifting
Out
of ............................................ 2-25
Brake
........................................................ 2-22
Over Things That Burn
................................. 2-26
Park (P) Mechanism Check
........................... 6-13
Parking on
Hills .............................................. 4-58
Shifting Into
................................................ 2-23
Parking
Brake and Automatic Transmission
Park (P)
Part A
- Scheduled Maintenance Services ............ 6-4
Part B
- Owner Checks and Services ................ 6-10
Part C
- Periodic Maintenance Inspections .......... 6-14
Part D
- Recommended Fluids and Lubricants .... 6-16
Part E
- Maintenance Record ........................... 6-18
Passenger Air Bag Indicator
............................. 2-30
Passenger Air Bag Status Indicator
................... 3-30
PASSENGER DOOR AJAR
.............................. 3-60
Passenger Sensing System
.............................. 1-68
Passing
......................................................... 4-14
Passlock@
...................................................... 2-14
10