2018 GMC YUKON XL check engine

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Service and Maintenance 373Maintenance Schedule
Additional Required
Services - Normal
12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi
180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 miRotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @Replace passenger compartment air filter. (1)
@ @ @ @ @ @Inspect evaporative control system. (2)
@ @ @Replace engine air cleaner filter. (3)
@ @ @Change transfer case fluid, if equipped with
4WD. (4)
@Replace spark plugs. Inspect spark plug wires.
@Drain and fill engine cooling system. (5)
@Visually inspect accessory drive belts. (6)
@Replace brake fluid. (7)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Service and Maintenance 375Maintenance Schedule
Additional Required
Services - Severe
12 000 km/7,500 mi
24 000 km/15,000 mi
36 000 km/22,500 mi
48 000 km/30,000 mi
60 000 km/37,500 mi
72 000 km/45,000 mi
84 000 km/52,500 mi
96 000 km/60,000 mi
108 000 km/67,500 mi
120 000 km/75,000 mi
132 000 km/82,500 mi
144 000 km/90,000 mi
156 000 km/97,500 mi
168 000 km/105,000 mi
180 000 km/112,500 mi
192 000 km/120,000 mi
204 000 km/127,500 mi
216 000 km/135,000 mi
228 000 km/142,500 mi
240 000 km/150,000 miRotate tires and perform Required Services.
Check engine oil level and oil life percentage.
Change engine oil and filter, if needed.
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @Replace passenger compartment air filter. (1)
@ @ @ @ @ @Inspect evaporative control system. (2)
@ @ @Replace engine air cleaner filter. (3)
@ @ @Change automatic transmission fluid and filter.
@ @ @Change transfer case fluid, if equipped with
4WD. (4)
@ @ @Replace spark plugs. Inspect spark plug wires.
@Drain and fill engine cooling system. (5)
@Visually inspect accessory drive belts. (6)
@Replace brake fluid. (7)
Footnotes — Maintenance
Schedule Additional Required
Services - Severe
(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.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Service and Maintenance 377.
To avoid break-down or failure to
start the vehicle, maintain a
battery with full cranking power.
.
Trained dealer technicians have
the diagnostic equipment to test
the battery and ensure that the
connections and cables are
corrosion-free.
Belts
.
Belts may need replacing if they
squeak or show signs of
cracking or splitting.
.
Trained dealer technicians have
access to tools and equipment
to inspect the belts and
recommend adjustment or
replacement when necessary.
Brakes
Brakes stop the vehicle and are
crucial to safe driving.
.
Signs of brake wear may include
chirping, grinding, or squealing
noises, or difficulty stopping. .
Trained dealer technicians have
access to tools and equipment
to inspect the brakes and
recommend quality parts
engineered for the vehicle.
Fluids
Proper fluid levels and approved
fluids protect the vehicle ’ s systems
and components. See
Recommended Fluids and
Lubricants 0 379 for GM approved
fluids.
.
Engine oil and windshield
washer fluid levels should be
checked at every fuel fill.
.
Instrument cluster lights may
come on to indicate that fluids
may be low and need to be
filled.
Hoses
Hoses transport fluids and should
be regularly inspected to ensure
that there are no cracks or leaks.
With a multi-point inspection, your
dealer can inspect the hoses and
advise if replacement is needed. Lamps
Properly working headlamps,
taillamps, and brake lamps are
important to see and be seen on
the road.
.
Signs that the headlamps need
attention include dimming, failure
to light, cracking, or damage.
The brake lamps need to be
checked periodically to ensure
that they light when braking.
.
With a multi-point inspection,
your dealer can check the lamps
and note any concerns.
Shocks and Struts
Shocks and struts help aid in control
for a smoother ride.
.
Signs of wear may include
steering wheel vibration, bounce/
sway while braking, longer
stopping distance, or uneven
tire wear.
.
As part of the multi-point
inspection, trained dealer
technicians can visually inspect
the shocks and struts for signs

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
384 Technical Data
Vehicle Data Capacities and Specifications The following approximate capacities are given in metric and English conversions. See Recommended Fluids and
Lubricants 0 379 for more information.
Application Capacities
Metric English
Air Conditioning Refrigerant For the air conditioning system refrigerant type and
charge amount, see the refrigerant label under the
hood. See your dealer for more information.
Cooling System
5.3L V8; 6.2L V8 16.8 L 17.8 qt
Engine Oil with Filter
5.3L V8; 6.2L V8 7.6 L 8.0 qt
Fuel Tank
Short Wheelbase 98.4 L 26.0 gal
Long Wheelbase 119.2 L 31.5 gal
Transfer Case Fluid 1.5 L 1.6 qt
Wheel Nut Torque 190 Y 140 lb ft
All capacities are approximate. When adding, be sure to fill to the approximate level, as recommended in this
manual. Recheck fluid level after filling.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
412 Index
Index A Accessories and
Modifications . . . . . . . . . . . . . . . . . . 278
Accessory Power . . . . . . . . . . . . . . . 212
Active Fuel Management . . . . . . . 214
Adaptive Cruise Control . . . . . . . . 235
Add-On Electrical Equipment . . . 274
Additional Information
OnStar . . . . . . . . . . . . . . . . . . . . . . . 406
Additional Maintenance
and Care . . . . . . . . . . . . . . . . . . . . . . 376
Adjustable Throttle and
Brake Pedal . . . . . . . . . . . . . . . . . . . 205
Adjustments
Lumbar, Front Seats . . . . . . . . . . . . 63
Air Cleaner/Filter, Engine . . . . . . . 290
Air Conditioning . . . . . . . . . . . 180, 184
Air Filter, Passenger
Compartment . . . . . . . . . . . . . . . . . 186
Air Vents . . . . . . . . . . . . . . . . . . . . . . . 185
Airbag System
Check . . . . . . . . . . . . . . . . . . . . . . . . . . 96
How Does an Airbag
Restrain? . . . . . . . . . . . . . . . . . . . . . 89
Passenger Sensing System . . . . 91
What Makes an Airbag
Inflate? . . . . . . . . . . . . . . . . . . . . . . . . 89 Airbag System (cont'd)
What Will You See after an
Airbag Inflates? . . . . . . . . . . . . . . . 90
When Should an Airbag
Inflate? . . . . . . . . . . . . . . . . . . . . . . . . 88
Where Are the Airbags? . . . . . . . . 86
Airbags
Adding Equipment to the
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . 95
Passenger Status Indicator . . . 142
Readiness Light . . . . . . . . . . . . . . 141
Servicing Airbag-Equipped
Vehicles . . . . . . . . . . . . . . . . . . . . . . . 95
System Check . . . . . . . . . . . . . . . . . . 85
Alarm
Vehicle Security . . . . . . . . . . . . . . . . 49
Alert
Lane Change . . . . . . . . . . . . . . . . . 250
Side Blind Zone (SBZA) . . . . . . 250
All-Season Tires . . . . . . . . . . . . . . . . 321
All-Terrain Tires . . . . . . . . . . . . . . . . . 322
Antilock Brake System (ABS) . . . 227
Warning Light . . . . . . . . . . . . . . . . . 145
Appearance Care
Exterior . . . . . . . . . . . . . . . . . . . . . . . 360
Interior . . . . . . . . . . . . . . . . . . . . . . . . 364
Armrest Storage . . . . . . . . . . . . . . . . 119

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
Index 413Assistance Program,
Roadside . . . . . . . . . . . . . . . . . . . . . . 390
Assistance Systems for
Driving . . . . . . . . . . . . . . . . . . . . . . . . 246
Assistance Systems for
Parking and Backing . . . . . . . . . . 243
Automatic
Dimming Mirrors . . . . . . . . . . . . . . . . 54
Door Locks . . . . . . . . . . . . . . . . . . . . . 42
Forward Braking . . . . . . . . . . . . . . 248
Headlamp System . . . . . . . . . . . . 173
Level Control . . . . . . . . . . . . . . . . . 232
Transmission . . . . . . . . . . . . . . . . . 216
Transmission Fluid . . . . . . 286, 289
Automatic Transmission
Manual Mode . . . . . . . . . . . . . . . . . 218
Shift Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 302
Axle, Front . . . . . . . . . . . . . . . . . . . . . . 300
Axle, Rear . . . . . . . . . . . . . . . . . . . . . . 300
B Battery
Exterior Lighting Battery
Saver . . . . . . . . . . . . . . . . . . . . . . . 178
Load Management . . . . . . . . . . . . 177 Battery (cont'd)
Power Protection . . . . . . . . . . . . . 178
Battery - North America . . . . 298, 351
Blade Replacement, Wiper . . . . . 303
Blind Spot Mirrors . . . . . . . . . . . . . . . 54
Brake
Pedal and Adjustable
Throttle . . . . . . . . . . . . . . . . . . . . . . 205
System Warning Light . . . . . . . . 145
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . 297
Antilock . . . . . . . . . . . . . . . . . . . . . . . 227
Assist . . . . . . . . . . . . . . . . . . . . . . . . . 228
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 297
Parking . . . . . . . . . . . . . . . . . . . . . . . 228
Braking . . . . . . . . . . . . . . . . . . . . . . . . . 190
Automatic Forward . . . . . . . . . . . 248
Break-In, New Vehicle . . . . . . . . . . 204
Bulb Replacement
Back-up Lamps . . . . . . . . . . . . . . . 307
Fog Lamps . . . . . . . . . . . . . . . . . . . 307
Headlamp Aiming . . . . . . . . . . . . . 306
Headlamps . . . . . . . . . . . . . . . . . . . 306
High Intensity Discharge
(HID) Lighting . . . . . . . . . . . . . . . 306
License Plate Lamps . . . . . . . . . 308
Buying New Tires . . . . . . . . . . . . . . . 335 C Calibration . . . . . . . . . . . . . . . . . . . . . . 126
California
Fuel Requirements . . . . . . . . . . . 255
Perchlorate Materials
Requirements . . . . . . . . . . . . . . . 278
California
Proposition
65 Warning . . . . . . . . . .277, 298, 351,
Back Cover
Canadian Vehicle Owners . . . . . . . . 2
Capacities and
Specifications . . . . . . . . . . . . . . . . . 384
Carbon Monoxide
Engine Exhaust . . . . . . . . . . . . . . . 215
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . 43
Winter Driving . . . . . . . . . . . . . . . . 198
Cargo
Tie-Downs . . . . . . . . . . . . . . . . . . . . 120
Caution, Danger, and Warning . . . . 2
Center Console Storage . . . . . . . . 120
Chains, Tire . . . . . . . . . . . . . . . . . . . . 340
Charging
Wireless . . . . . . . . . . . . . . . . . . . . . . 129
Charging System Light . . . . . . . . . 142
Check
Engine Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 143

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
414 Index Check (cont'd)
Ignition Transmission Lock . . . 303
Child Restraints
Infants and Young Children . . . . . 98
Lower Anchors and Tethers
for Children . . . . . . . . . . . . . . . . . 104
Older Children . . . . . . . . . . . . . . . . . . 97
Securing . . . . . . . . . . . . . . . . . .112, 114
Systems . . . . . . . . . . . . . . . . . . . . . . 101
Child-View Mirror . . . . . . . . . . . . . . . . 56
Circuit Breakers . . . . . . . . . . . . . . . . 309
Cleaning
Exterior Care . . . . . . . . . . . . . . . . . 360
Interior Care . . . . . . . . . . . . . . . . . . 364
Climate Control Systems
Dual Automatic . . . . . . . . . . . . . . . 180
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Cluster, Instrument . . . . . . . . . . . . . 133
Collision Damage Repair . . . . . . . 393
Compartments
Storage . . . . . . . . . . . . . . . . . . . . . . . .118
Compass . . . . . . . . . . . . . . . . . . . . . . . 126
Connections
OnStar . . . . . . . . . . . . . . . . . . . . . . . 403
Control
Hill Descent . . . . . . . . . . . . . . . . . . 231 Control (cont'd)
Traction and Electronic
Stability . . . . . . . . . . . . . . . . . . . . . 229
Control of a Vehicle . . . . . . . . . . . . . 190
Convenience Net . . . . . . . . . . . . . . . 120
Convex Mirrors . . . . . . . . . . . . . . . . . . 52
Coolant
Engine Temperature Gauge . . 138
Engine Temperature
Warning Light . . . . . . . . . . . . . . . 148
Cooling . . . . . . . . . . . . . . . . . . . . 180, 184
Cooling System . . . . . . . . . . . . . . . . . 291
Courtesy Transportation
Program . . . . . . . . . . . . . . . . . . . . . . . 392
Cruise Control . . . . . . . . . . . . . . . . . . 233
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Cruise Control, Adaptive . . . . . . . . 235
Cupholders . . . . . . . . . . . . . . . . . . . . . 118
Customer Assistance . . . . . . . . . . . 389
Offices . . . . . . . . . . . . . . . . . . . . . . . . 388
Text Telephone (TTY)
Users . . . . . . . . . . . . . . . . . . . . . . . 389
Customer Information
Service Publications
Ordering Information . . . . . . . . 395
Customer Satisfaction
Procedure . . . . . . . . . . . . . . . . . . . . . 386 D Damage Repair, Collision . . . . . . . 393
Danger, Warning, and Caution . . . . 2
Data Collection
Infotainment System . . . . . . . . . . 399
OnStar . . . . . . . . . . . . . . . . . . . . . . . 399
Data Recorders, Event . . . . . . . . . 398
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . . . 173
Defensive Driving . . . . . . . . . . . . . . . 190
Delayed Locking . . . . . . . . . . . . . . . . . 42
Diagnostics
OnStar . . . . . . . . . . . . . . . . . . . . . . . 405
Distracted Driving . . . . . . . . . . . . . . . 189
Dome Lamps . . . . . . . . . . . . . . . . . . . 176
Door
Ajar Light . . . . . . . . . . . . . . . . . . . . . 150
Delayed Locking . . . . . . . . . . . . . . . . 42
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Power Locks . . . . . . . . . . . . . . . . . . . . 42
Drive Belt Routing, Engine . . . . . . 385
Driver Assistance Systems . . . . . 242
Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . . 151
Driving
Assistance Systems . . . . . . . . . . 246
Characteristics and
Towing Tips . . . . . . . . . . . . . . . . . 259

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