trailer GMC YUKON XL 2018 Service Manual

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 295If Steam is Coming from the
Engine Compartment
{ WarningSteam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure
cap, even a little, can cause them
to come out at high speed and
you could be burned. Never turn
the cap when the cooling system,
including the pressure cap, is hot.
Wait for the cooling system and
pressure cap to cool.
If No Steam is Coming from
the Engine Compartment The ENGINE OVERHEATED STOP
ENGINE or the ENGINE
OVERHEATED IDLE ENGINE
message, along with a low coolant
condition, can indicate a serious
problem. If there is an engine overheat
warning, but no steam is seen or
heard, the problem may not be too
serious. Sometimes the engine can
get a little too hot when the vehicle:
.
Climbs a long hill on a hot day.
.
Stops after high-speed driving.
.
Idles for long periods in traffic.
.
Tows a trailer; see Trailer Towing
0 262 .
If the ENGINE OVERHEATED
STOP ENGINE or the ENGINE
OVERHEATED IDLE ENGINE
message appears with no sign of
steam, try this for a minute or so:
1. Turn the air conditioning off.
2. Turn the heater on to the
highest temperature and to the
highest fan speed. Open the
windows as necessary.
3. When it is safe to do so, pull off
the road, shift to P (Park) or
N (Neutral), and let the
engine idle.
If the engine coolant temperature
gauge is no longer in the overheat
zone or an overheat warning no longer displays, the vehicle can be
driven. Continue to drive the vehicle
slowly for about 10 minutes. Keep a
safe vehicle distance from the
vehicle in front. If the warning does
not come back on, continue to drive
normally and have the cooling
system checked for proper fill and
function.
If the warning continues, pull over,
stop, and park the vehicle
right away.
If there is still no sign of steam and
the vehicle is equipped with an
engine driven cooling fan, push
down the accelerator until the
engine speed is about twice as fast
as normal idle speed for at least
five minutes while the vehicle is
parked. If the warning is still there,
turn off the engine and get everyone
out of the vehicle until it cools down.
If there is no sign of steam, idle the
engine for five minutes while
parked. If the warning is still
displayed, turn off the engine until it
cools down.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
296 Vehicle Care
Engine Fan If the vehicle has electric cooling
fans, the fans may be heard
spinning at low speed during most
everyday driving. The fans may turn
off if no cooling is required. Under
heavy vehicle loading, trailer towing,
high outside temperatures,
or operation of the air conditioning
system, the fans may change to
high speed and an increase in fan
noise may be heard. This is normal
and indicates that the cooling
system is functioning properly. The
fans will change to low speed when
additional cooling is no longer
required.
The electric engine cooling fans
may run after the engine has been
turned. off. This is normal and no
service is required.
Washer Fluid What to Use
When windshield washer fluid needs
to be added, be sure to read the
manufacturer's instructions before
use. Use a fluid that has sufficient protection against freezing in an
area where the temperature may fall
below freezing.
Adding Washer Fluid The vehicle has a low washer fluid
message on the DIC that comes on
when the washer fluid is low. The
message is displayed for
15 seconds at the start of each
ignition cycle. When the WASHER
FLUID LOW ADD FLUID message
displays, washer fluid will need to
be added to the windshield washer
fluid reservoir.
Open the cap with the washer
symbol on it. Add washer fluid until
the tank is full. See Engine
Compartment Overview 0 280 for
reservoir location. Caution .
Do not use washer fluid that
contains any type of water
repellent coating. This can
cause the wiper blades to
chatter or skip.
.
Do not use engine coolant
(antifreeze) in the
windshield washer. It can
damage the windshield
washer system and paint.
.
Do not mix water with
ready-to-use washer fluid.
Water can cause the
solution to freeze and
damage the washer fluid
tank and other parts of the
washer system.
.
When using concentrated
washer fluid, follow the
manufacturer instructions for
adding water.
.
Fill the washer fluid tank
only three-quarters full when
it is very cold. This allows
for fluid expansion if
(Continued)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
312 Vehicle Care Fuses Usage
4 Passenger
motorized seat belt
5 Suspension
leveling
compressor
6 4WD transfer case
electronic control
7 –
8 –
10 Electric parking
brake/ –
11 –
12 –
13 Interior BEC LT2
14 Rear BEC 1
15 –
16 –
17 Driver motorized
seat belt
18 –
19 –
20 – Fuses Usage
21 Automatic
headlamp leveling/
Exhaust solenoid
22 Fuel pump
23 Integrated chassis
control module
24 Real time
dampening
25 Fuel pump power
module
26 – /Battery regulated
voltage control
27 –
28 Upfitter 2
30 Wiper
31 Trailer interface
module
32 –
33 –
34 Reverse lamps
35 Antilock brake
system valve
36 Trailer brakes Fuses Usage
38 –
39 Right trailer
stoplamp/Turn
signal lamp
40 Left trailer
stoplamp/turn
signal lamp
41 Trailer parking
lamps
42 Right parking
lamps
43 Left parking lamps
44 Upfitter 3
45 Automatic level
control/Run/Crank
46 –
47 Upfitter 4
49 Reverse lamps
50 –
52 –
53 –
54 –

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 313Fuses Usage
55 –
56 –
57 –
58 –
59 Euro trailer
60 Air conditioning
control
61 –
62 –
63 Upfitter 1
64 –
65 –
66 –
67 Trailer battery
68 Secondary
fuel pump
69 RC upfitter 3 and 4
70 VBAT
upfitter 3 and 4
71 –
73 – Fuses Usage
74 Engine control
module/Ignition
75 Miscellaneous/
Ignition/ –
76 Transmission/
Ignition
77 RC upfitter 1 and 2
78 VBAT
upfitter 1 and 2
79 –
80 –
81 –
82 –
83 Euro trailer/RC
85 –
86 –
87 Engine
88 Injector A – odd
89 Injector B – even
90 O2 sensor B
91 Throttle control Fuses Usage
93 Horn
94 Fog lamps
95 High-beam
headlamps
96 –
97 –
98 –
99 –
100 O2 sensor A
101 Engine control
module
102 Engine control
module/
Transmission
control module
103 Auxiliary interior
heater
104 Starter
105 –
106 –
107 Aeroshutter
108 –

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
316 Vehicle Care Fuses Usage
18 Mirror window module
19 Body control module 1
20 Front bolster (if
equipped)
21 –
22 –
23 –
24 HVAC/Ignition
25 Instrument cluster/
Ignition sensing
diagnostic module/
Ignition
26 Tilt column/SEO/Tilt
column lock 1/SEO
27 Data link connector/
Driver seat module
28 Passive entry/Passive
start/HVAC battery
29 Content theft
deterrent
30 –
31 –
32 – Fuses Usage
33 SEO/Automatic level
control/Left
heated seat
34 Park enable/Electric
adjustable pedal (if
equipped)
35 –
36 Miscellaneous/Run
crank
37 Heated steering wheel
38 Steering column
lock 2 (if equipped)
39 Instrument cluster
battery
40 –
41 –
42 Euro trailer (if
equipped)
43 Left doors
44 Driver power seat
45 – Fuses Usage
46 Right heated, cooled,
or ventilated seat (if
equipped)
47 Left heated, cooled,
or ventilated seat (if
equipped)
48 –
49 –
50 Accessory power
outlet 2
51 –
52 Retained accessory
power relay
54 –
55 –
56 –
Relays Usage
52 Retained accessory
power
53 Run/Crank relay

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 323(2) TPC Spec (Tire
Performance Criteria
Specification) :
Original
equipment tires designed to
GM's specific tire performance
criteria have a TPC specification
code molded onto the sidewall.
GM's TPC specifications meet or
exceed all federal safety
guidelines.
(3) DOT (Department of
Transportation) :
The
Department of Transportation
(DOT) code indicates that the
tire is in compliance with the
U.S. Department of
Transportation Motor Vehicle
Safety Standards.
DOT Tire Date of
Manufacture :
The last four
digits of the TIN indicate the tire
manufactured date. The first two
digits represent the week
(01-52) and the last two digits,
the year. For example, the third week of the year 2010 would
have a four-digit DOT date
of 0310.
(4) Tire Identification Number
(TIN) :
The letters and numbers
following the DOT code are the
Tire Identification Number (TIN).
The TIN shows the
manufacturer and plant code,
tire size, and date the tire was
manufactured. The TIN is
molded onto both sides of the
tire, although only one side may
have the date of manufacture.
(5) Tire Ply Material :
The type
of cord and number of plies in
the sidewall and under the tread.
(6) Uniform Tire Quality
Grading (UTQG) :
Tire
manufacturers are required to
grade tires based on three
performance factors: treadwear,
traction, and temperature
resistance. For more
information, see Uniform Tire
Quality Grading 0 337 . (7) Maximum Cold Inflation
Load Limit :
Maximum load that
can be carried and the
maximum pressure needed to
support that load. For
information on recommended
tire pressure see Tire Pressure
0 327 and Vehicle Load Limits
0 200 .
(8) Temporary Use Only :
Only
use a temporary spare tire until
the road tire is repaired and
replaced. This spare tire should
not be driven on over 112 km/h
(70 mph), or 88 km/h (55 mph)
when pulling a trailer, with the
proper inflation pressure. See
Full-Size Spare Tire 0 350 .

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 351instructions on how to remove,
install, or store a spare tire, see Tire
Changing 0 342 .
If equipped with a temporary use
full-size spare tire, it is indicated on
the tire sidewall. See Tire Sidewall
Labeling 0 322 . This spare tire
should not be driven on over
112 km/h (70 mph), or 88 km/h
(55 mph) when pulling a trailer, at
the proper inflation pressure. Repair
and replace the road tire as soon as
it is convenient, and stow the spare
tire for future use.
CautionIf the vehicle has four-wheel drive
and a different size spare tire is
installed, do not drive in
four-wheel drive until the flat tire
is repaired and/or replaced. The
vehicle could be damaged and
the repairs would not be covered
by the warranty. Never use
four-wheel drive when a different
size spare tire is installed on the
vehicle. The vehicle may have a different
size spare tire than the road tires
originally installed on the vehicle.
This spare tire was developed for
use on this vehicle, so it is all right
to drive on it. If the vehicle has
four-wheel drive and a different size
spare tire is installed, drive only in
two-wheel drive.
After installing the spare tire on the
vehicle, stop as soon as possible
and check that the spare tire is
correctly inflated.
Have the damaged or flat road tire
repaired or replaced and installed
back onto the vehicle as soon as
possible so the spare tire will be
available in case it is needed again.
Do not mix tires and wheels of
different sizes, because they will not
fit. Keep your spare tire and its
wheel together. If the vehicle has a
spare tire that does not match the
original road tires and wheels in size
and type, do not include the spare in
the tire rotation. Jump Starting Jump Starting - North
America For more information about the
vehicle battery, see Battery - North
America 0 298 .
If the vehicle's battery has run
down, you may want to use another
vehicle and some jumper cables to
start your vehicle. Be sure to use
the following steps to do it safely.
{ WarningWARNING: Battery posts,
terminals, and related
accessories contain lead and lead
compounds, chemicals known to
the State of California to cause
cancer and birth defects or other
reproductive harm. Batteries also
contain other chemicals known to
the State of California to cause
cancer. WASH HANDS AFTER
(Continued)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
356 Vehicle Care dinghy and dolly towing. Dinghy
towing is towing the vehicle with all
four wheels on the ground. Dolly
towing is towing the vehicle with two
wheels on the ground and two
wheels on a dolly.
Follow the tow vehicle
manufacturer ’ s instructions. See
your dealer or trailering professional
for additional advice and equipment
recommendations.
CautionUse of a shield mounted in front
of the vehicle grille could restrict
airflow and cause damage to the
transmission. The repairs would
not be covered by the vehicle
warranty. If using a shield, only
use one that attaches to the
towing vehicle. Dinghy Towing Two-Wheel-Drive Vehicles
CautionIf the two-wheel-drive vehicle is
towed with all four wheels on the
ground, the drivetrain
components could be damaged.
The repairs would not be covered
by the vehicle warranty.
Two-wheel-drive vehicles should not
be towed with all four wheels on the
ground. Four-Wheel-Drive Vehicles
Only dinghy tow four-wheel-drive
vehicles with a two speed transfer
case that have a N (Neutral) and a 4
n setting.
{ Warning
Shifting a four-wheel-drive
vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). You or others could
be injured. Set the parking brake
before shifting the transfer case
to N (Neutral).

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
370 Service and Maintenance have your dealer perform these
services every 12 000 km/7,500 mi.
Proper vehicle maintenance helps to
keep the vehicle in good working
condition, improves fuel economy,
and reduces vehicle emissions.
Because of the way people use
vehicles, maintenance needs vary.
There may need to be more
frequent checks and services. The
Additional Required Services -
Normal are for vehicles that:
.
Carry passengers and cargo
within recommended limits on
the Tire and Loading Information
label. See Vehicle Load Limits
0 200 .
.
Are driven on reasonable road
surfaces within legal driving
limits.
.
Use the recommended fuel. See
Fuel 0 254 .
Refer to the information in the
Maintenance Schedule Additional
Required Services - Normal chart.
The Additional Required Services -
Severe are for vehicles that are: .
Mainly driven in heavy city traffic
in hot weather
.
Mainly driven in hilly or
mountainous terrain
.
Frequently towing a trailer
.
Used for high speed or
competitive driving
.
Used for taxi, police, or delivery
service
Refer to the information in the
Maintenance Schedule Additional
Required Services - Severe chart.
{ WarningPerforming maintenance work can
be dangerous and can cause
serious injury. Perform
maintenance work only if the
required information, proper tools,
and equipment are available.
If they are not, see your dealer to
have a trained technician do the
work. See Doing Your Own
Service Work 0 278 .Maintenance
Schedule Owner Checks and Services At Each Fuel Stop
.
Check the engine oil level. See
Engine Oil 0 283 .
Once a Month
.
Check the tire inflation
pressures. See Tire Pressure
0 327 .
.
Inspect the tires for wear. See
Tire Inspection 0 333 .
.
Check the windshield washer
fluid level. See Washer Fluid
0 296 .
Engine Oil Change When the CHANGE ENGINE OIL
SOON message displays, have the
engine oil and filter changed within
the next 1 000 km/600 mi. If driven
under the best conditions, the
engine oil life system may not
indicate the need for vehicle service
for up to a year. The engine oil and
filter must be changed at least once

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
422 Index Tires (cont'd)
Rotation . . . . . . . . . . . . . . . . . . . . . . 334
Sidewall Labeling . . . . . . . . . . . . . 322
Terminology and Definitions . . 324
Uniform Tire Quality
Grading . . . . . . . . . . . . . . . . . . . . . 337
Wheel Alignment and Tire
Balance . . . . . . . . . . . . . . . . . . . . . 339
Wheel Replacement . . . . . . . . . . 339
When It Is Time for New
Tires . . . . . . . . . . . . . . . . . . . . . . . . 335
Winter . . . . . . . . . . . . . . . . . . . . . . . . 321
Tow/Haul Mode . . . . . . . . . . . . . . . . . 222
Tow/Haul Mode Light . . . . . . . . . . . 146
Towing
Driving Characteristics . . . . . . . . 259
Equipment . . . . . . . . . . . . . . . . . . . . 267
General Information . . . . . . . . . . 259
Recreational Vehicle . . . . . . . . . . 355
Trailer . . . . . . . . . . . . . . . . . . . . . . . . 262
Trailer Sway Control (TSC) . . . 273
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 355
Traction
Control System (TCS)/
StabiliTrak Light . . . . . . . . . . . . . 147
Off Light . . . . . . . . . . . . . . . . . . . . . . 147
Traction Control/Electronic
Stability Control . . . . . . . . . . . . . . . 229 Trailer
Sway Control (TSC) . . . . . . . . . . 273
Towing . . . . . . . . . . . . . . . . . . . . . . . . 262
Transfer Case . . . . . . . . . . . . . . . . . . 222
Transmission
Automatic . . . . . . . . . . . . . . . . . . . . . 216
Fluid, Automatic . . . . . . . . . 286, 289
Temperature Gauge . . . . . . . . . . 139
Transportation Program,
Courtesy . . . . . . . . . . . . . . . . . . . . . . 392
Trip Odometer . . . . . . . . . . . . . . . . . . 136
Turn and Lane-Change
Signals . . . . . . . . . . . . . . . . . . . . . . . . 174
U Uniform Tire Quality Grading . . . 337
Universal Remote System . . . . . . 166
Operation . . . . . . . . . . . . . . . . . . . . . 168
Programming . . . . . . . . . . . . . . . . . 166
Using This Manual . . . . . . . . . . . . . . . . 2
V Vehicle
Alarm System . . . . . . . . . . . . . . . . . . 49
Canadian Owners . . . . . . . . . . . . . . . 2
Control . . . . . . . . . . . . . . . . . . . . . . . 190
Identification Number (VIN) . . . 383
Load Limits . . . . . . . . . . . . . . . . . . . 200
Messages . . . . . . . . . . . . . . . . . . . . 157 Vehicle (cont'd)
Personalization . . . . . . . . . . . . . . . 158
Remote Start . . . . . . . . . . . . . . . . . . . 39
Security . . . . . . . . . . . . . . . . . . . . . . . . 49
Speed Messages . . . . . . . . . . . . . 158
Towing . . . . . . . . . . . . . . . . . . . . . . . . 355
Vehicle Ahead Indicator . . . . . . . . 146
Vehicle Care
Tire Pressure . . . . . . . . . . . . . . . . . 327
Vehicle Data Recording and
Privacy . . . . . . . . . . . . . . . . . . . . . . . . 398
Ventilation, Air . . . . . . . . . . . . . . . . . . 185
Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Voltmeter Gauge . . . . . . . . . . . . . . . 140
W Warning
Brake System Light . . . . . . . . . . . 145
Caution and Danger . . . . . . . . . . . . . 2
Lane Departure (LDW) . . . . . . . 252
Warning Lights, Gauges, and
Indicators . . . . . . . . . . . . . . . . . . . . . 132
Warnings
Hazard Flashers . . . . . . . . . . . . . . 174
Washer Fluid . . . . . . . . . . . . . . . . . . . 296
Wheels
Alignment and Tire Balance . . 339
Different Size . . . . . . . . . . . . . . . . . 337
Replacement . . . . . . . . . . . . . . . . . 339