transmission GMC YUKON 2003 Repair Manual

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
shift lever is in PARK (P).
The key should come out only in LOCK.
Parking Brake and Automatic
Transmission Park (P) Mechanism
Check
{CAUTION:
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.
To check the PARK (P) mechanism’s holding ability:
With the engine running, shift to PARK (P). Then
release the parking brake followed by the regular
brake.
Underbody Flushing Service
At least every spring, use plain water toush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
6-14
2003 - Yukon/Yukon XL

Part D: Recommended Fluids and
Lubricants
Fluids and lubricants identied below by name, part
number or specication may be obtained from your
dealer.
Usage Fluid/Lubricant
Engine OilEngine oil with the American
Petroleum Institute Certied for
Gasoline Engines starburst symbol
of the proper viscosity. To determine
the preferred viscosity for your
vehicle’s engine, seeEngine Oil on
page 5-16.
Engine Coolant50/50 mixture of clean, drinkable
water and use only
DEX-COOL
®Coolant. SeeEngine
Coolant on page 5-26.
Hydraulic Brake
SystemDelco Supreme 11 Brake Fluid or
equivalent DOT-3 brakeuid.
Windshield
Washer SolventGM Optikleen
®Washer Solvent or
equivalent.
Power Steering
SystemGM Power Steering Fluid (GM Part
No. U.S. 1052884, in Canada
993294, or equivalent).
Automatic
TransmissionDEXRON
®-III Automatic
Transmission Fluid.
Usage Fluid/Lubricant
Key Lock
CylindersMulit-Purpose Lubricant, Superlube
(GM Part No. U.S. 12346241, in
Canada 10953474, or equivalent).
Chassis
LubricationChassis Lubricant (GM Part No.
U.S. 12377985, in Canada
88901242, or equivalent) or lubricant
meeting requirements of NLGI #2,
Category LB or GC-LB.
Front Axle
(Four-Wheel
Drive)SAE 80W-90 Axle Lubricant
(GM Part No. U.S. 1052271, in
Canada 10950849 or equivalent).
Front Axle
(All-Wheel
Drive)SAE 75W-90 Synthetic Axle
Lubricant (GM Part No. U.S.
12378261, in Canada 10953455) or
equivalent meeting GM Specication
9986115.
Rear AxleSAE 75W-90 Synthetic Axle
Lubricant (GM Part No. U.S.
12378261, in Canada 10953455) or
equivalent meeting GM Specication
9986115.
Rear Axle
(Steerable)Synthetic Axle Lubricant; use only
GM Part No. 12378557 (in Canada
88901362). Do not add friction
modier.
Transfer Case
(All-Wheel
Drive with
Stabilitrak
®)Dexron-III Automatic Transmission
Fluid.
6-17
2003 - Yukon/Yukon XL

Reporting Safety Defects to the
Canadian Government
If you live in Canada, and you believe that your vehicle
has a safety defect, you should immediately notify
Transport Canada, in addition to notifying General
Motors of Canada Limited. You may write to:
Transport Canada
330 Sparks Street
Tower C
Ottawa, Ontario K1A 0N5
Reporting Safety Defects to General
Motors
In addition to notifying NHTSA (or Transport Canada) in
a situation like this, we certainly hope you’ll notify us.
Please call us at 1-800-GMC-8782 (1-800-462-8782), or
write:
Pontiac-GMC Customer Assistance Center
P.O. Box 33172
Detroit, MI 48232-5172
In Canada, please call us at 1-800-263-3777 (English)
or 1-800-263-7854 (French). Or, write:
General Motors of Canada Limited
Customer Communication Centre, 163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Service Publications Ordering
Information
Service Manuals
Service Manuals have the diagnosis and repair
information on engines, transmission, axle, suspension,
brakes, electrical, steering, body, etc.
RETAIL SELL PRICE: $120.00
Transmission, Transaxle, Transfer
Case Unit Repair Manual
This manual provides information on unit repair service
procedures, adjustments, and specications for GM
transmissions, transaxles, and transfer cases.
RETAIL SELL PRICE: $50.00
Service Bulletins
Service Bulletins give technical service information
needed to knowledgeably service General Motors cars
and trucks. Each bulletin contains instructions to
assist in the diagnosis and service of your vehicle.
In Canada, information pertaining to Product Service
Bulletins can be obtained by contacting your General
Motors dealer or by calling 1-800-GM-DRIVE
(1-800-463-7483).
7-10
2003 - Yukon/Yukon XL

Audio System(s) (cont.)
Setting the Time for Radios with Radio Data
Systems (RDS)........................................3-72
Setting the Time for Radios without Radio
Data Systems (RDS)................................3-71
Theft-Deterrent Feature...............................3-122
Understanding Radio Reception...................3-123
XM™Satellite Radio Antenna System...........3-126
Automatic Headlamp System............................3-15
Automatic Level Control...................................4-60
Automatic Transfer Case..................................2-26
Automatic Transmission
Fluid..........................................................5-23
Operation...................................................2-22
Automatic Transmission Check..........................6-12
Automatic Transmission Shift Lock Control
System Check.............................................6-13
Autoride™.....................................................4-60
Auxiliary Roof Mounted Lamp Switch.................3-17
B
Backing Up....................................................4-69
Battery..........................................................5-43
BATTERY NOT CHARGING.............................3-65
Battery Replacement......................................... 2-6
Battery Run-Down Protection............................3-20
Battery Warning Light......................................3-42
Before Leaving on a Long Trip.........................4-44
Before You Drive...........................................3-111Before You Go Off-Roading..............................4-25
Bench Seat....................................................1-15
Bench Seat Split (50/50)..................................1-11
Bench Seat, Split (60/40)................................... 1-9
Body Lubrication Service..................................6-12
Brake
Parking......................................................2-34
System Inspection.......................................6-16
System Warning Light..................................3-43
Brake Adjustment............................................5-43
Brake Fluid
....................................................5-40
Brake Pedal, Throttle
.......................................2-21
Brake Pedal Travel
.........................................5-43
Brake Wear
...................................................5-42
Brakes
..........................................................5-40
Braking
........................................................... 4-6
Braking in Emergencies
..................................... 4-9
Break-In, New Vehicle
.....................................2-18
Bucket Seats, Rear
.........................................1-20
Bulb Replacement
...........................................5-52
Front Turn Signal, Sidemarker and Daytime
Running Lamps
........................................5-54
Halogen Bulbs
............................................5-53
Headlamps
.................................................5-53
Replacement Bulbs
......................................5-59
Roof Marker Lamps
.....................................5-55
Side Identification Marker Lamps
...................5-55
Taillamps
....................................................5-57
Buying New Tires
...........................................5-64
2
2003 - Yukon/Yukon XL

Fluid
Automatic Transmission................................5-23
Power Steering...........................................5-38
Windshield Washer......................................5-39
FM Stereo....................................................3-123
Fog Lamps
....................................................3-17
Folding the Seatback
.......................................1-16
Folding the Seatbacks
.......................1-9, 1-11, 1-20
Following Distance
..........................................4-69
Footnotes
........................................................ 6-5
Four-Wheel Drive
....................................2-26, 5-51
Front Axle
......................................................5-52
Front Axle Locking Feature
...............................2-26
Front Reading Lamps
......................................3-19
Front Storage Area
.........................................2-54
Frontal Air Bags
.............................................1-76
Fuel
............................................................... 5-4
Additives
...................................................... 5-5
California Fuel
.............................................. 5-5
E-85 (85% Ethanol)
....................................... 5-6
Filling a Portable Fuel Container
....................5-10
Filling Your Tank
........................................... 5-7
Fuels in Foreign Countries
.............................. 5-7
Gage
.........................................................3-52
Gasoline Octane
........................................... 5-4
Gasoline Specifications
.................................. 5-4Fuel (cont.)
Low Warning Light.......................................3-53
System Inspection.......................................6-15
Fuel Information Button....................................3-56
FUEL LEVEL LOW.........................................3-67
Fuses
Fuses and Circuit Breakers...........................5-98
Windshield Wiper.........................................5-97
G
Gage
Engine Coolant Temperature.........................3-46
Fuel..........................................................3-52
Oil Pressure...............................................3-51
Speedometer..............................................3-39
Tachometer.................................................3-39
Transmission Temperature.............................3-46
Voltmeter Gage...........................................3-43
Garage Door Opener.......................................2-50
Gasoline
Octane........................................................ 5-4
Specifications............................................... 5-4
Gate Operator and Canadian Programming........2-53
Getting Familiar with Off-Road Driving................4-26
Glove Box.....................................................2-54
GM Mobility Program for Persons with
Disabilities.................................................... 7-5
7
2003 - Yukon/Yukon XL

H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-8
Headlamp High/Low-Beam Changer.................... 3-9
Headlamps....................................................5-53
Bulb Replacement.......................................5-52
Front Turn Signal, Sidemarker and Daytime
Running Lamps........................................5-54
Halogen Bulbs............................................5-53
Roof Marker Lamps.....................................5-55
Side Identification Marker Lamps...................5-55
Headphones.................................................3-117
Heated Seats................................................... 1-5
Heating.........................................................3-30
Highway Hypnosis...........................................4-44
Hill and Mountain Roads..................................4-45
Hitches..........................................................4-67
HomeLink Transmitter, Programming..................2-51
HomeLink
®Transmitter....................................2-50
Hood
Checking Things Under................................5-10
Release.....................................................5-11
Horn ............................................................... 3-7
How to Add Coolant to the Coolant Surge Tank......5-34
How to Add Fluid
............................................5-25
How to Check
........................................5-23, 5-61
How to Check Lubricant
...................................5-50How to Check Power Steering Fluid..................5-39
How to Inspect...............................................5-21
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-27
Hydroplaning..................................................4-40
I
If No Steam Is Coming From Your Engine..........5-31
If Steam Is Coming From Your Engine...............5-30
If the Light is Flashing.....................................3-49
If the Light Is On Steady.................................3-49
If You Are Stuck in Sand, Mud, Ice or Snow.......4-52
If You Do Decide To Pull A Trailer.....................4-62
If You’re Caught in a Blizzard...........................4-50
Ignition Positions.............................................2-19
Ignition Transmission Lock Check......................6-14
Infants and Young Children, Restraints...............1-46
Inflation -- Tire Pressure..................................5-61
Inspection
Brake System.............................................6-16
Engine Cooling System................................6-16
Exhaust System..........................................6-15
Fuel System...............................................6-15
Part C - Periodic Maintenance.......................6-15
Steering and Suspension..............................6-15
Transfer Case and Front Axle
(Four-Wheel Drive)...................................6-16
8
2003 - Yukon/Yukon XL

Mirrors (cont.)
Outside Manual Mirrors................................2-45
Outside Power Camper-Type.........................2-47
Outside Power Foldaway Mirrors....................2-47
Outside Power Mirrors..................................2-46
Model Reference................................................ vi
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-18
Normal Maintenance Replacement Parts...........5-109
O
Odometer......................................................3-39
Off-Road Recovery..........................................4-19
Oil
Engine.......................................................5-16
Pressure Gage............................................3-51
OIL PRESSURE LOW .....................................3-65
Older Children, Restraints................................1-44
Online Owner Center........................................ 7-3
OnStar
®Personal Calling.................................2-49
OnStar®Services............................................2-49
OnStar®Steering Wheel Controls......................2-50
OnStar®System.............................................2-48
OnStar®Virtual Advisor....................................2-49
Operating Your All-Wheel-Drive Vehicle Off
Paved Roads..............................................4-22Other Warning Devices...................................... 3-7
Outlet Adjustment...................................3-25, 3-31
Outside
Automatic Dimming Mirror.............................2-47
Camper-Type Mirrors....................................2-46
Convex Mirror.............................................2-48
Curb View Assist Mirrors..............................2-47
Heated Mirrors............................................2-48
Manual Mirrors............................................2-45
Power Foldaway Mirrors...............................2-47
Power Mirrors.............................................2-46
Outside Power Camper-Type Mirror...................2-47
Overheated Engine Protection Operating Mode
(V8 Engines Only).......................................5-29
Owners, Canadian............................................... ii
Owner’s Information........................................7-11
P
Panel Doors...................................................2-13
Park (P)
Shifting Out of............................................2-37
Parking
Brake........................................................2-34
Over Things That Burn.................................2-38
Parking Brake and Automatic Transmission Park
(P) Mechanism Check..................................6-14
Parking on Hills..............................................4-71
Park(P)
Shifting Into................................................2-35
11
2003 - Yukon/Yukon XL

Theft-Deterrent Systems (cont.)
Content Theft-Deterrent................................2-16
Passlock
®...................................................2-18
Third Row......................................................1-64
Throttle, Adjustable..........................................2-21
Tilt Wheel........................................................ 3-7
Tilting the 50/50 Split Bench Seat.....................1-12
Tilting the Bench Seat.....................................1-16
Tire Inflation Check.........................................6-11
Tires.............................................................5-60
Buying New Tires........................................5-64
Chains.......................................................5-68
Changing a Flat Tire....................................5-69
If a Tire Goes Flat.......................................5-69
Inflation -- Tire Pressure...............................5-61
Inspection and Rotation................................5-61
Spare Tire..................................................5-88
Uniform Tire Quality Grading.........................5-65
Wheel Alignment and Tire Balance.................5-66
Wheel Replacement.....................................5-66
When It Is Time for New Tires......................5-63
To Use the Engine Coolant Heater....................2-22
Top Strap......................................................1-54
Top Strap Anchor Location...............................1-55
Torque Lock...................................................2-37
Total Weight on Your Vehicle’s Tires..................4-66
Tow/Haul Mode ...............................................2-25Tow/Haul Mode Light.......................................3-52
Towing
Recreational Vehicle.....................................4-55
Towing a Trailer..........................................4-61
Your Vehicle...............................................4-54
Traction
Assist System (TAS)....................................4-10
Off Light.....................................................3-45
Stabilitrak
®System......................................4-12
TRACTION ACTIVE........................................3-68
Traction Control Operation................................4-13
Trailer
Recommendations
.......................................4-60
Trailer Brakes
.................................................4-68
Trailer Wiring Harness
.....................................4-72
Transfer Case
........................................5-49, 5-51
Transfer Case and Front Axle (Four-Wheel Drive)
Inspection
...................................................6-16
Transmission
Fluid, Automatic
...........................................5-23
Temperature Gage
.......................................3-46
TRANSMISSION HOT
.....................................3-68
Transmission Operation, Automatic
....................2-22
Transmission, Transaxle, Transfer Case Unit
Repair Manual
............................................7-10
Transportation Options
...................................... 7-8
16
2003 - Yukon/Yukon XL