2003 GMC YUKON automatic transmission

Keys...............................................................2-3
Remote Keyless Entry System.........................2-4
Remote Keyless Entry System Operation...........2-5
Doors and Locks.............................................2-7
Door Locks....................................................2-7
Power Door Locks..........................................2-8
Delayed Locking.............................................2-9
Programmable Automatic Door Locks................2-9
Rear Door Security Locks..............................2-11
Lockout Protection........................................2-12
Liftgate........................................................2-12
Windows........................................................2-14
Manual Windows..........................................2-14
Power Windows............................................2-15
Sun Visors...................................................2-15
Theft-Deterrent Systems..................................2-16
Content Theft-Deterrent.................................2-16
Passlock
®....................................................2-18
Starting and Operating Your Vehicle................2-18
New Vehicle Break-In....................................2-18
Ignition Positions..........................................2-19
Starting Your Engine.....................................2-20
Adjustable Throttle and Brake Pedal................2-21
Engine Coolant Heater
..................................2-21Automatic Transmission Operation...................2-22
Four-Wheel Drive..........................................2-26
All-Wheel Drive with Stabilitrak
®......................2-31
Parking Brake..............................................2-34
Shifting Into Park (P).....................................2-35
Shifting Out of Park (P).................................2-37
Parking Over Things That Burn.......................2-38
Engine Exhaust............................................2-38
Running Your Engine While You Are Parked. . . .2-39
Mirrors...........................................................2-40
Manual Rearview Mirror.................................2-40
Automatic Dimming Rearview Mirror with
OnStar
®, Compass and Temperature
Display....................................................2-40
Automatic Dimming Rearview Mirror with
Compass and Temperature Display..............2-43
Outside Manual Mirrors..................................2-45
Outside Camper-Type Mirrors.........................2-46
Outside Power Mirrors...................................2-46
Outside Power Camper-Type Mirror.................2-47
Outside Power Foldaway Mirrors.....................2-47
Outside Automatic Dimming Mirror..................2-47
Outside Curb View Assist Mirrors....................2-47
Outside Convex Mirror...................................2-48
Outside Heated Mirrors..................................2-48
Section 2Features and Controls
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2003 - Yukon/Yukon XL

Delayed Locking
When you lock the doors using the power lock switch or
the remote keyless entry transmitter with any door or
the liftgate open three chimes will signal that delayed
locking is being used.
Five seconds after the last door is closed, all the doors
will lock. All doors and liftgate can be re-opened for
up tove seconds from the time the last door is closed.
You can lock the door immediately using the power
door lock switch or the optional remote keyless
entry transmitter a second time.
This feature will not lock the doors if the key is in the
ignition.
To enable or disable the delayed locking feature, do the
following:
1. Press and hold the power door lock switch on the
driver’s door in the lock position.
2. Press the remote keyless entry transmitter unlock
button twice.
If the feature is disabled, the doors will lock immediately
when a power door lock switch or remote keyless
entry transmitter button is pressed.
Programmable Automatic Door
Locks
Your vehicle may be equipped with an automatic
lock/unlock feature which enables you to program your
vehicle’s power door locks. You can program this
feature through the Driver Information Center (DIC), or
by the following method.
Programmable Locking Feature
The following is the list of available programming
options:
Mode 1:All doors lock when the transmission is shifted
into gear. This is the mode that is pre-programmed in
the factory for your vehicle for automatic transmission
vehicles.
Mode 2:All doors lock when the vehicle speed is
greater than 8 mph (13 km/h). This is the mode that is
pre-programmed in the factory for manual transmission
vehicles.
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2003 - Yukon/Yukon XL

Mode 3:No automatic door locking.
The following instructions tell you how to change the
automatic door lock mode. Choose one of the three
programming options listed above before entering the
program mode. To enter the program mode, do the
following:
1. Begin with the ignition off. Then pull the turn
signal/multifunction lever toward you and hold
it there while you perform the next step.
2. Turn the key to RUN then back to LOCK twice.
Then, with the key in LOCK, release the turn
signal/multifunction lever. Once you do this, the
doors will lock and unlock, the horn will chirp twice,
and a 30-second timer will begin. You are now
ready to program the automatic door lock feature.
3. Press the door lock switch once. You will hear one,
two, or three chimes. The number of chimes tells you
which lock mode is currently selected. Continue to
press the door lock switch until the number of chimes
that you hear matches the number of the mode that
you want. If you take longer than 30 seconds, the
locks will automatically lock and unlock and the horn
will chirp twice to indicate that you have left the
program mode. If this occurs, you can repeat the
procedure beginning with Step 1 to re-enter the
programming mode.You can exit the program mode any time by turning the
ignition to RUN (the doors will automatically lock and
unlock and the horn will chirp twice to indicate that you
are leaving the program mode). If the lock/unlock
switches are not pressed while in the programming
mode, the current automatic settings will not be
modied.
See your dealer for more information.
Programmable Unlocking Feature
The following is the list of available programming
options:
Mode 1:Driver’s door unlocks when the transmission
is shifted into PARK (P)(automatic transmission
vehicles only).
Mode 2:All doors unlock when the transmission is
shifted into PARK (P)(automatic transmission vehicles
only). This is the mode that is pre-programmed in
the factory for your vehicle.
Mode 3:All doors unlock when the key is removed
from the ignition This is the mode that is
pre-programmed in the factory for manual transmission
vehicles.
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2003 - Yukon/Yukon XL

To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord. The
cord is located on the driver’s side of the engine
compartment, near the power steeringuid
reservoir. If you have a diesel engine, refer to
diesel supplement for location.
3. Plug it into a normal, grounded 110-volt AC outlet.
{CAUTION:
Plugging the cord into an ungrounded outlet
could cause an electrical shock. Also, the
wrong kind of extension cord could overheat
and cause afire. You could be seriously
injured. Plug the cord into a properly grounded
three-prong 110-volt AC outlet. If the cord
won’t reach, use a heavy-duty three-prong
extension cord rated for at least 15 amps.4. Before starting the engine, be sure to unplug and
store the cord as it was before to keep it away
from moving engine parts. If you don’t, it could be
damaged.
How long should you keep the coolant heater plugged
in? The answer depends on the outside temperature, the
kind of oil you have, and some other things. Instead
of trying to list everything here, we ask that you contact
your dealer in the area where you’ll be parking your
vehicle. The dealer can give you the best advice for that
particular area.Automatic Transmission Operation
There are several different positions for your shift lever.
Your vehicle is equipped with an automatic transmission
and features an electronic shift position indicator
within the instrument panel cluster. This display must be
powered anytime the shift lever is capable of being
moved out of PARK (P).
PARK (P):This position locks your rear wheels. It’s the
best position to use when you start your engine
because your vehicle can’t move easily.
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2003 - Yukon/Yukon XL

NEUTRAL (N):In this position, your engine doesn’t
connect with the wheels. To restart when you’re already
moving, use NEUTRAL (N) only. Also, use
NEUTRAL (N) when your two-wheel drive vehicle is
being towed.
{CAUTION:
Shifting into a drive gear while your engine is
“racing”(running at high speed) is dangerous.
Unless your foot isfirmly on the brake pedal,
your vehicle could move very rapidly. You
could lose control and hit people or objects.
Don’t shift into a drive gear while your engine
is racing.
Notice:Damage to your transmission caused by
shifting out of PARK (P) or NEUTRAL (N) with
the engine racing isn’t covered by your warranty.
DRIVE (D):This position is for normal driving. If
you need more power for passing, and you’re:
Going less than about 35 mph (56 km/h), push your
accelerator pedal about halfway down.
Going about 35 mph (56 km/h) or more, push the
accelerator all the way down.You’ll shift down to the next gear and have more power.
DRIVE (D) can be used when towing a trailer, carrying
a heavy load, driving on steep hills or for off-road driving.
You may want to shift the transmission to THIRD (3)
or, if necessary, a lower gear selection if the
transmission shifts too often.
THIRD (3):This position is also used for normal driving,
however it offers more power and lower fuel economy
than DRIVE (D).
SECOND (2):This position gives you more power but
lower fuel economy. You can use SECOND (2) on
hills. It can help control your speed as you go down
steep mountain roads, but then you would also want to
use your brakes off and on.
If you manually select SECOND (2) in a light duty
automatic transmission, the transmission will drive in
second gear. You may use this feature for reducing the
speed of the rear wheels when you are trying to start
your vehicle from a stop on slippery road surfaces.
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2003 - Yukon/Yukon XL

When tow/haul mode is
selected the tow/haul
indicator light will
illuminate.
The tow/haul mode also interacts with the Autoride™
feature, if your vehicle is so equipped, to enhance
the ride when trailering or with a loaded vehicle. See
Autoride™on page 4-60.
Four-Wheel Drive
If your vehicle has four-wheel drive, you can send your
engine’s driving power to all four wheels for extra
traction. To get the most satisfaction out of four-wheel
drive, you must be familiar with its operation. Read
the part that follows before using four-wheel drive. See
the appropriate text for the transfer case in your
vehicle.
Notice:Driving in the 4-WHEEL HIGH (4HI) or
4-WHEEL LOW (4LO) positions for a long time on
dry or wet pavement could shorten the life of
your vehicle’s drivetrain.
Front Axle Locking Feature
The front axle locks and unlocks automatically when
you shift the transfer case. Some delay for the axle to
lock or unlock is normal.
Automatic Transfer Case
{CAUTION:
Shifting the transfer case to NEUTRAL can
cause your vehicle to roll even if the
transmission is in PARK (P). You or someone
else could be seriously injured. Be sure to set
the parking brake before placing the transfer
case in NEUTRAL. See″Parking Brake″in the
Index.
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2003 - Yukon/Yukon XL

All-Wheel Drive with Stabilitrak®
With this feature, engine power is sent to all four wheels
all the time.
This is like four-wheel drive, but there is no separate
lever or switch to engage or disengage the front axle. It
is fully automatic, and adjust itself as needed for
road conditions.
The transfer case buttons are located to the left of the
instrument panel cluster.
Use these switches to shift into and out of four-wheel
drive.You can choose among three driving settings:d(Stabilitrak®):This button is used with the
Stabilitrak®system and is also used to shift the transfer
case into Neutral. For more information on using
Stabilitrak
®seeStabilitrak®System on page 4-12.
f(All-Wheel Drive):This setting delivers power to
all four wheels as needed depending on road and driving
conditions.
g(4LO):This setting delivers extra torque. You may
never need this setting. It sends maximum power to
all four wheels. You might choose 4LO if you are driving
off-road in deep sand, deep mud, deep snow and
climbing or descending steep hills.
{CAUTION:
Shifting the transfer case to NEUTRAL can
cause your vehicle to roll even if the
transmission is in PARK (P). You or someone
else could be seriously injured. Be sure to set
the parking brake before placing the transfer
case in NEUTRAL. See″Parking Brake″in the
Index.
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2003 - Yukon/Yukon XL

If you have to leave your vehicle with the engine
running, be sure your vehicle is in PARK (P) and the
parking brake isrmly set before you leave it. After you
move the shift lever into PARK (P), hold the regular
brake pedal down. Then, see if you can move the shift
lever away from PARK (P) withoutrst pulling it
toward you. If you can, it means that the shift lever
wasn’t fully locked into PARK (P).
Torque Lock
If you are parking on a hill and you don’t shift your
transmission into PARK (P) properly, the weight of the
vehicle may put too much force on the parking pawl in the
transmission. You maynd it difficult to pull the shift lever
out of PARK (P). This is called″torque lock.″To prevent
torque lock, set the parking brake and then shift into
PARK (P) properly before you leave the driver’s seat. To
nd out how, seeShifting Into Park (P) on page 2-35.
When you are ready to drive, move the shift lever out of
PARK (P)beforeyou release the parking brake.
If torque lock does occur, you may need to have another
vehicle push yours a little uphill to take some of the
pressure from the parking pawl in the transmission, so
you can pull the shift lever out of PARK (P).
Shifting Out of Park (P)
Your vehicle has an automatic transmission shift lock
control system. You have to fully apply your regular
brakes before you can shift from PARK (P) when the
ignition is in RUN. SeeAutomatic Transmission
Operation on page 2-22.
If you cannot shift out of PARK (P), ease pressure on
the shift lever and push the shift lever all the way up into
PARK (P) as you maintain brake application. Then,
move the shift lever into the gear you want.
If you ever hold the brake pedal down but still can’t shift
out of PARK (P), try this:
1. Turn the key to LOCK.
2. Apply and hold the brake until the end of Step 4.
3. Shift the vehicle to NEUTRAL (N).
4. Start the vehicle and then shift to the drive gear
you want.
5. Have the systemxed as soon as you can.
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2003 - Yukon/Yukon XL