fuel pressure GMC YUKON XL 2018 User Guide

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
Driving and Operating 269Pressing this button at the end of
the shift lever turns on and off the
Tow/Haul Mode.
This indicator light on the instrument
cluster comes on when the Tow/
Haul Mode is on.
Tow/Haul is a feature that assists
when pulling a heavy trailer or a
large or heavy load. See Tow/Haul
Mode 0 222 .
Tow/Haul is designed to be most
effective when the vehicle and
trailer combined weight is at least
75 % of the vehicle's Gross
Combined Weight Rating (GCWR).
See “ Weight of the Trailer ” under
Trailer Towing 0 262 . Tow/Haul is
most useful under the following
driving conditions:
.
When pulling a heavy trailer or a
large or heavy load through
rolling terrain. .
When pulling a heavy trailer or a
large or heavy load in
stop-and-go traffic.
.
When pulling a heavy trailer or a
large or heavy load in busy
parking lots where improved low
speed control of the vehicle is
desired.
Operating the vehicle in Tow/Haul
when lightly loaded or with no trailer
at all will not cause damage.
However, there is no benefit to the
selection of Tow/Haul when the
vehicle is unloaded. Such a
selection when unloaded may result
in unpleasant engine and
transmission driving characteristics
and reduced fuel economy. Tow/
Haul is recommended only when
pulling a heavy trailer or a large or
heavy load. Integrated Trailer Brake
Control System
The vehicle may have an Integrated
Trailer Brake Control (ITBC) system
for use with electric trailer brakes or
most electric-over-hydraulic trailer
brakes.
This symbol is on the Trailer Brake
Control Panel on vehicles with an
ITBC system. The power output to
the trailer brakes is based on the
amount of brake pressure being
applied by the vehicle ’ s brake
system, and on the type of trailer
brakes detected. This available
power output to the trailer brakes
can be adjusted to a wide range of
trailering situations.
The ITBC system is integrated with
the vehicle ’ s brake, antilock brake,
and StabiliTrak systems. In trailering
conditions that cause the vehicle ’ s

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 325Bead :
The tire bead contains
steel wires wrapped by steel
cords that hold the tire onto
the rim.
Bias Ply Tire :
A pneumatic tire
in which the plies are laid at
alternate angles less than
90 degrees to the centerline of
the tread.
Cold Tire Pressure :
The
amount of air pressure in a tire,
measured in kPa (kilopascal)
or psi (pounds per square inch)
before a tire has built up heat
from driving. See Tire Pressure
0 327 .
Curb Weight :
The weight of a
motor vehicle with standard and
optional equipment including the
maximum capacity of fuel, oil,
and coolant, but without
passengers and cargo.
DOT Markings :
A code molded
into the sidewall of a tire
signifying that the tire is in
compliance with the U.S. Department of Transportation
(DOT) Motor Vehicle Safety
Standards. The DOT code
includes the Tire Identification
Number (TIN), an alphanumeric
designator which can also
identify the tire manufacturer,
production plant, brand, and
date of production.
GVWR :
Gross Vehicle Weight
Rating. See Vehicle Load Limits
0 200 .
GAWR FRT :
Gross Axle Weight
Rating for the front axle. See
Vehicle Load Limits 0 200 .
GAWR RR :
Gross Axle Weight
Rating for the rear axle. See
Vehicle Load Limits 0 200 .
Intended Outboard Sidewall :
The side of an asymmetrical tire
that must always face outward
when mounted on a vehicle.
Kilopascal (kPa) :
The metric
unit for air pressure. Light Truck (LT-Metric) Tire :
A
tire used on light duty trucks and
some multipurpose passenger
vehicles.
Load Index :
An assigned
number ranging from 1 to 279
that corresponds to the load
carrying capacity of a tire.
Maximum Inflation Pressure :
The maximum air pressure to
which a cold tire can be inflated.
The maximum air pressure is
molded onto the sidewall.
Maximum Load Rating :
The
load rating for a tire at the
maximum permissible inflation
pressure for that tire.
Maximum Loaded Vehicle
Weight :
The sum of curb
weight, accessory weight,
vehicle capacity weight, and
production options weight.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 327Vehicle Maximum Load on the
Tire :
Load on an individual tire
due to curb weight, accessory
weight, occupant weight, and
cargo weight.
Vehicle Placard :
A label
permanently attached to a
vehicle showing the vehicle
capacity weight and the original
equipment tire size and
recommended inflation pressure.
See “ Tire and Loading
Information Label ” under Vehicle
Load Limits 0 200 .
Tire Pressure Tires need the correct amount of
air pressure to operate
effectively. Caution
Neither tire underinflation nor
overinflation is good.
Underinflated tires, or tires
that do not have enough air,
can result in: .
Tire overloading and
overheating which could
lead to a blowout. .
Premature or
irregular wear. .
Poor handling. .
Reduced fuel economy.
Overinflated tires, or tires that
have too much air, can
result in: .
Unusual wear.
.
Poor handling.
.
Rough ride.
.
Needless damage from
road hazards. The Tire and Loading
Information label on the vehicle
indicates the original equipment
tires and the correct cold tire
inflation pressures. The
recommended pressure is the
minimum air pressure needed to
support the vehicle's maximum
load carrying capacity.
For additional information
regarding how much weight the
vehicle can carry, and an
example of the Tire and Loading
Information label, see Vehicle
Load Limits 0 200 . How the
vehicle is loaded affects vehicle
handling and ride comfort. Never
load the vehicle with more
weight than it was designed to
carry.
When to Check
Check the tires once a month
or more.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Vehicle Care 329
Tire Pressure Monitor
System The Tire Pressure Monitor System
(TPMS) uses radio and sensor
technology to check tire pressure
levels. The TPMS sensors monitor
the air pressure in your tires and
transmit tire pressure readings to a
receiver located in the vehicle.
Each tire, including the spare (if
provided), should be checked
monthly when cold and inflated to
the inflation pressure recommended
by the vehicle manufacturer on the
vehicle placard or tire inflation
pressure label. (If your vehicle has
tires of a different size than the size
indicated on the vehicle placard or
tire inflation pressure label, you
should determine the proper tire
inflation pressure for those tires.)
As an added safety feature, your
vehicle has been equipped with a
tire pressure monitoring system
(TPMS) that illuminates a low tire
pressure telltale when one or more
of your tires is significantly
under-inflated. Accordingly, when the low tire
pressure telltale illuminates, you
should stop and check your tires as
soon as possible, and inflate them
to the proper pressure. Driving on a
significantly under-inflated tire
causes the tire to overheat and can
lead to tire failure. Under-inflation
also reduces fuel efficiency and tire
tread life, and may affect the
vehicle's handling and stopping
ability.
Please note that the TPMS is not a
substitute for proper tire
maintenance, and it is the driver's
responsibility to maintain correct tire
pressure, even if under-inflation has
not reached the level to trigger
illumination of the TPMS low tire
pressure telltale.
Your vehicle has also been
equipped with a TPMS malfunction
indicator to indicate when the
system is not operating properly.
The TPMS malfunction indicator is
combined with the low tire pressure
telltale. When the system detects a
malfunction, the telltale will flash for
approximately one minute and then
remain continuously illuminated. This sequence will continue upon
subsequent vehicle start-ups as
long as the malfunction exists.
When the malfunction indicator is
illuminated, the system may not be
able to detect or signal low tire
pressure as intended. TPMS
malfunctions may occur for a variety
of reasons, including the installation
of replacement or alternate tires or
wheels on the vehicle that prevent
the TPMS from functioning properly.
Always check the TPMS malfunction
telltale after replacing one or more
tires or wheels on your vehicle to
ensure that the replacement or
alternate tires and wheels allow the
TPMS to continue to function
properly.
See Tire Pressure Monitor
Operation 0 330 .
See Radio Frequency Statement
0 396 .

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
364 Vehicle Care For 1500 Series vehicles, at least
every other oil change lubricate the
outer tie rod ends.
Control arm ball joints on 1500
Series vehicles are
maintenance-free.
CautionLubrication of applicable steering/
suspension points should not be
done unless the temperature is
− 12 °C (10 °F) or higher,
or damage could result.
Body Component Lubrication Lubricate all key lock cylinders,
hood hinges, liftgate hinges, steel
fuel door hinge and power assist
step hinges, unless the components
are plastic. Applying silicone grease
on weatherstrips with a clean cloth
will make them last longer, seal
better, and not stick or squeak.
Underbody Maintenance
At least twice a year, spring and fall,
use plain water to flush any
corrosive materials from the underbody. Take care to thoroughly
clean any areas where mud and
other debris can collect. If equipped
with power assist steps, extend
them and then use a high pressure
wash to clean all joints and gaps.
Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water
can overcome the seals and
contaminate the fluid. Contaminated
fluid will decrease the life of the
transfer case and/or axles and
should be replaced.
Sheet Metal Damage If the vehicle is damaged and
requires sheet metal repair or
replacement, make sure the body
repair shop applies anti-corrosion
material to parts repaired or
replaced to restore corrosion
protection.
Original manufacturer replacement
parts will provide the corrosion
protection while maintaining the
vehicle warranty. Finish Damage Quickly repair minor chips and
scratches with touch-up materials
available from your dealer to avoid
corrosion. Larger areas of finish
damage can be corrected in your
dealer's body and paint shop.
Chemical Paint Spotting Airborne pollutants can fall upon
and attack painted vehicle surfaces
causing blotchy, ring-shaped
discolorations, and small, irregular
dark spots etched into the paint
surface. See “ Finish Care ”
previously in this section.
Interior Care To prevent dirt particle abrasions,
regularly clean the vehicle's interior.
Immediately remove any soils.
Newspapers or dark garments can
transfer color to the vehicle ’ s
interior.
Use a soft bristle brush to remove
dust from knobs and crevices on the
instrument cluster. Using a mild
soap solution, immediately remove

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 - 6/20/17
Service and Maintenance 371a year and the oil life system must
be reset. Your trained dealer
technician can perform this work.
If the engine oil life system is reset
accidentally, service the vehicle
within 5 000 km/3,000 mi since the
last service. Reset the oil life
system when the oil is changed.
See Engine Oil Life System 0 285 .
Tire Rotation and Required
Services Every 12 000 km/
7,500 mi Rotate the tires, if recommended for
the vehicle, and perform the
following services. See Tire
Rotation 0 334 .
.
Check engine oil level and oil
life percentage. If needed,
change engine oil and filter, and
reset oil life system.
See Engine Oil 0 283 and
Engine Oil Life System 0 285 . .
Check engine coolant level. See
Cooling System 0 291 .
.
Check windshield washer fluid
level. See Washer Fluid 0 296 .
.
Visually inspect windshield wiper
blades for wear, cracking,
or contamination. See Exterior
Care 0 360 . Replace worn or
damaged wiper blades. See
Wiper Blade Replacement
0 303 .
.
Check tire inflation pressures.
See Tire Pressure 0 327 .
.
Inspect tire wear. See Tire
Inspection 0 333 .
.
Visually check for fluid leaks.
.
Inspect engine air cleaner filter.
See Engine Air Cleaner/Filter
0 290 .
.
Inspect brake system. See
Exterior Care 0 360 . .
Visually inspect steering,
suspension, and chassis
components for damaged, loose,
or missing parts or signs of wear
at least once a year. See
Exterior Care 0 360 . Lubricate
the suspension and steering
components at least every other
oil change (if equipped with
grease fittings).
.
Check restraint system
components. See Safety System
Check 0 83 .
.
Visually inspect fuel system for
damage or leaks.
.
Visually inspect exhaust system
and nearby heat shields for
loose or damaged parts.
.
Lubricate body components. See
Exterior Care 0 360 .
.
Check starter switch. See Starter
Switch Check 0 302 .

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
374 Service and Maintenance Footnotes — Maintenance
Schedule Additional Required
Services - Normal
(1) Or every two years, whichever
comes first. More frequent
passenger compartment air filter
replacement may be needed if
driving in areas with heavy traffic,
poor air quality, high dust levels,
or environmental allergens.
Passenger compartment air filter
replacement may also be needed if
there is reduced airflow, window
fogging, or odors. Your GM dealer
can help determine when to replace
the filter.
(2) Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(3) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
(4) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water
can overcome the seals and
contaminate the transfer case fluid. Contaminated fluid will decrease the
life of the transfer case and/or axles
and should be replaced.
(5) Or every five years, whichever
comes first. See Cooling System
0 291 .
(6) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0 297 .

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
404 OnStar devices. Manage data usage by
turning Wi-Fi on or off on your
mobile device, using the myGMC
mobile app, or by contacting an
OnStar Advisor. On some vehicles,
Wi-Fi can also be managed from the
Wi-Fi Hotspot menu.
MyGMC Mobile App (If Available)
Download the myGMC mobile app
to compatible Apple and Android
smartphones. GMC users can
access the following services from a
smartphone:
.
Remotely start/stop the vehicle,
if factory-equipped.
.
Lock/unlock doors, if equipped
with automatic locks.
.
Activate the horn and lamps.
.
Check the vehicle ’ s fuel level, oil
life, or tire pressure,
if factory-equipped with the Tire
Pressure Monitor System.
.
Send destinations to the vehicle.
.
Locate the vehicle on a map
(U.S. market only). .
Turn the vehicle's Wi-Fi hotspot
on/off, manage settings, and
monitor data consumption,
if equipped.
.
Locate a dealer and schedule
service.
.
Request roadside assistance.
.
Set a parking reminder with pin
drop, take a photo, make a note,
and set a timer.
.
Connect with GMC on social
media.
For myGMC mobile app information
and compatibility, see my.gmc.com.
An active OnStar service,
compatible device, factory-installed
remote start, and power locks are
required. Data rates apply. See
onstar.com for details and system
limitations.
Remote Services
Contact an OnStar Advisor to
unlock the doors or sound the horn
and flash the lamps. OnStar AtYourService OnStar Advisors can provide offers
from restaurants and retailers on
your route, help locate hotels,
or book a room. These services
vary by market.
OnStar Hands-Free Calling Make and receive calls with the
built-in wireless calling service,
which requires available minutes.
Functionality of the Voice Command
button may vary by vehicle and
region. For some vehicles, press
=to open the OnStar app on the
infotainment display, then select
Hands-Free calling. For other
vehicles press
= as follows.
Make a Call
1. Press
= . System responds:
“ OnStar ready. ”
2. Say “ Call. ” System responds:
“ Call. Please say the name or
number to call. ”

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
Index 415Driving (cont'd)
Defensive . . . . . . . . . . . . . . . . . . . . . 190
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . 190
For Better Fuel Economy . . . . . . . 26
Hill and Mountain Roads . . . . . . 198
If the Vehicle is Stuck . . . . . . . . . 200
Loss of Control . . . . . . . . . . . . . . . 192
Off-Road . . . . . . . . . . . . . . . . . . . . . 192
Off-Road Recovery . . . . . . . . . . . 191
Vehicle Load Limits . . . . . . . . . . . 200
Wet Roads . . . . . . . . . . . . . . . . . . . 197
Winter . . . . . . . . . . . . . . . . . . . . . . . . 198
Dual Automatic Climate
Control System . . . . . . . . . . . . . . . . 180
E E85 or FlexFuel . . . . . . . . . . . . . . . . 256
Electrical Equipment,
Add-On . . . . . . . . . . . . . . . . . . . . . . . 274
Electrical System
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 310
Fuses and Circuit Breakers . . . 309
Instrument Panel Fuse
Block . . . . . . . . . . . . . . . . . . . 314, 317
Overload . . . . . . . . . . . . . . . . . . . . . 309
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 319 Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . 401
Engine
Air Cleaner/Filter . . . . . . . . . . . . . 290
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 143
Compartment Overview . . . . . . . 280
Coolant Temperature
Gauge . . . . . . . . . . . . . . . . . . . . . . 138
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . 148
Cooling System . . . . . . . . . . . . . . . 291
Drive Belt Routing . . . . . . . . . . . . 385
Exhaust . . . . . . . . . . . . . . . . . . . . . . 215
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Heater . . . . . . . . . . . . . . . . . . . . . . . . 210
Oil Life System . . . . . . . . . . . . . . . 285
Oil Pressure Gauge . . . . . . . . . . 137
Oil Pressure Light . . . . . . . . . . . . 149
Overheating . . . . . . . . . . . . . . . . . . 294
Power Messages . . . . . . . . . . . . . 158
Running While Parked . . . . . . . . 215
Starting . . . . . . . . . . . . . . . . . . . . . . . 209
Entry Lighting . . . . . . . . . . . . . . . . . . . 177
Equipment, Towing . . . . . . . . . . . . . 267
Event Data Recorders . . . . . . . . . . 398
Exit Lighting . . . . . . . . . . . . . . . . . . . . 177
Extended Parking . . . . . . . . . . . . . . . 214 Extender, Seat Belt . . . . . . . . . . . . . . 83
Exterior Lamp Controls . . . . . . . . . 170
Exterior Lamps Off Reminder . . . 172
Exterior Lighting Battery
Saver . . . . . . . . . . . . . . . . . . . . . . . . . 178
F Fan
Engine . . . . . . . . . . . . . . . . . . . . . . . . 296
Features
Memory . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filter,
Engine Air Cleaner . . . . . . . . . . . 290
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 172
Flashers, Hazard Warning . . . . . . 174
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 341
Changing . . . . . . . . . . . . . . . . . . . . . 342
FlexFuel
E85 . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Floor Mats . . . . . . . . . . . . . . . . . . . . . . 367
Fluid
Automatic
Transmission . . . . . . . . . . . 286, 289
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 297
Four-Wheel Drive
Transfer Case . . . . . . . . . . . . . . . 222
Washer . . . . . . . . . . . . . . . . . . . . . . . 296
Fog Lamps . . . . . . . . . . . . . . . . . . . . . 175
Bulb Replacement . . . . . . . . . . . . 307