2020 GMC YUKON roof

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
Driving and Operating 189
To gain more ground clearance if
needed, it may be necessary to
remove the front fascia lower air
dam, if equipped. However, driving
without the air dam reduces fuel
economy.
Caution
Operating the vehicle for
extended periods without the front
fascia lower air dam installed can
cause improper airflow to the
engine. Reattach the front fascia
air dam after off-road driving.
Loading the Vehicle for
Off-Road Driving
{Warning
.Unsecured cargo on the
load floor can be tossed
about when driving over
rough terrain. You or your
(Continued)
Warning (Continued)
passengers can be struck
by flying objects. Secure the
cargo properly.
. Keep cargo in the cargo
area as far forward and as
low as possible. The
heaviest things should be
on the floor, forward of the
rear axle.
. Heavy loads on the roof
raise the vehicle's center of
gravity, making it more likely
to roll over. You can be
seriously or fatally injured if
the vehicle rolls over. Put
heavy loads inside the
cargo area, not on the roof.
For more information about loading
the vehicle, see Vehicle Load Limits
0 196 and
Tires 0326.
Environmental Concerns
.
Always use established trails,
roads, and areas that have been
set aside for public off-road
recreational driving and obey all
posted regulations.
. Do not damage shrubs, flowers,
trees, or grasses or disturb
wildlife.
. Do not park over things that
burn. See Parking over Things
That Burn 0211.
Driving on Hills
Driving safely on hills requires good
judgment and an understanding of
what the vehicle can and cannot do.
{Warning
Many hills are simply too steep
for any vehicle. Driving up hills
can cause the vehicle to stall.
Driving down hills can cause loss
of control. Driving across hills can
(Continued)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
208 Driving and Operating
at or below−18 °C (0 °F). Vehicles
with an engine heater should be
plugged in at least four hours before
starting. There may be an internal
thermostat in the plug end of the
cord, which will prevent engine
heater operation at temperatures
above −18 °C (0 °F).
To Use the Engine Heater
1. Turn off the engine.
2. Open the hood and unwrap the
electrical cord. The cord is by
the left front fender, next to the
engine compartment fuse
block.
Check the heater cord for
damage. If it is damaged, do
not use it. See your dealer for
a replacement. Inspect the
cord for damage yearly.
3. Plug the cord into a normal, grounded 110-volt AC outlet.
{Warning
Improper use of the heater cord
or an extension cord can damage
the cord and may result in
overheating and fire.
. Plug the cord into a
three-prong electrical utility
receptacle that is protected
by a ground fault detection
function. An ungrounded
outlet could cause an
electric shock.
. Use a weatherproof,
heavy-duty, 15 amp-rated
extension cord if needed.
Failure to use the
recommended extension
cord in good operating
condition, or using a
damaged heater or
extension cord, could make
(Continued)
Warning (Continued)
it overheat and cause a fire,
property damage, electric
shock, and injury.
. Do not operate the vehicle
with the heater cord
permanently attached to the
vehicle. Possible heater
cord and thermostat
damage could occur.
. While in use, do not let the
heater cord touch vehicle
parts or sharp edges. Never
close the hood on the
heater cord.
. Before starting the vehicle,
unplug the cord, reattach
the cover to the plug, and
securely fasten the cord.
Keep the cord away from
any moving parts.
4. Before starting the engine, be sure to unplug and store the
cord as it was before to keep it

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
Driving and Operating 209
away from moving engine
parts. If you do not, it could be
damaged.
The length of time the heater should
remain plugged in depends on
several factors. Ask a dealer in the
area where you will be parking the
vehicle for the best advice on this.
Retained Accessory
Power (RAP)
When the ignition is turned from on
to off, the following features (if
equipped) will continue to function
for up to 10 minutes, or until the
driver door is opened. These
features will also work when the
ignition is in RUN or ACC/
ACCESSORY:
. Infotainment System
. Power Windows (during RAP
this functionality will be lost
when any door is opened)
. Sunroof (during RAP this
functionality will be lost when
any door is opened)
. Auxiliary Power Outlet .
Audio System
. OnStar System
Shifting Into Park
{Warning
It can be dangerous to get out of
the vehicle if the shift lever is not
fully in P (Park) with the parking
brake firmly set. The vehicle can
roll. If you have left the engine
running, the vehicle can move
suddenly. You or others could be
injured. To be sure the vehicle will
not move, even when you are on
fairly level ground, use the steps
that follow. If the vehicle has a
four-wheel-drive transfer case
with an N (Neutral) position, and
the transfer case is in N (Neutral),
the vehicle will be free to roll,
even if the shift lever is in
P (Park). Be sure the transfer
case is in a drive gear. If towing a
trailer, see Driving Characteristics
and Towing Tips 0259. 1. Hold the brake pedal down,
then set the parking brake. See
Parking Brake 0225.
2. Move the shift lever into the P (Park) position by pulling the
shift lever toward you and
moving it up as far as it will go.
3. Be sure the transfer case is in a drive gear –not in
N (Neutral).
4. Push the ignition key in, towards the steering column
and then turn the ignition off.
5. Remove the key and take it with you. If you can leave the
vehicle with the ignition key in
your hand, the vehicle is in
P (Park).
Leaving the Vehicle with the
Engine Running
{Warning
It can be dangerous to leave the
vehicle with the engine running.
The vehicle could move suddenly
(Continued)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
322 Vehicle Care
FusesUsage
19 Body control module 4
20 Rear seat entertainment
21 Sunroof/beacon upffiter
22 –
23 –
24 –
25 –
26 Infotainment/Airbag
27 –/RF window switch/
Rain sensor
28 Obstacle detection/USB
29 Radio Fuses
Usage
30 –
31 –
32 –
33 –
34 –
35 –
36 Special equipment option B2
37 Special equipment option
38 Body control module 2
39 DC to AC inverter
40 –
41 –
42 –
43 – Fuses
Usage
44 Right door window motor
45 Front blower
46 Body control module 6
47 Body control module 7
48 Amplifier
49 Right front seat
50 Accessory power outlet 3
56 –
Relays Usage
51 –
52 Retained accessory power
53 –
54 –
55 –

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
324 Vehicle Care
The vehicle may not be equipped
with all of the fuses, relays, and
features shown.Fuses Usage
1 –
2 –
3 –
4 Accessory power outlet 1
5 Accessory power outlet from retained
accessory power
6 Accessory power outlet from battery
power
7 Universal garage door opener/SEO Roof
beacon switch
8 SEO/Retained accessory power
9 –
10 Body control module 3 11 Body control module 5 Fuses Usage
12 Steering wheel control backlighting
13 –
14 –
15 –
16 Discrete logic ignition sensor
17 Video processing module/Virtual key
module
18 Mirror window module
19 Body control module 1
20 Front bolster
21 –
22 –
23 –
24 HVAC ignition/AUX HVAC ignition
25 Instrument cluster/ Ignition sensing
diagnostic module
ignition Fuses Usage
26 Tilt column/Tilt column lock 1/SEO 1/SEO 2
27 Data link connector/ Driver seat module
28 Passive entry, Passive start/HVAC
battery/ CGM
29 Content theft deterrent
30 –
31 –
32 –
33 SEO Automatic level control/Left
heated seat
34 Park enable/Electric adjustable pedal
35 –
36 Miscellaneous/Run crank
37 Heated steering wheel
38 Steering column lock 2

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13566587) - 2020 - CRC - 4/15/19
380 Service and Maintenance
.Inspect brake system. See
Exterior Care 0367.
. Visually inspect steering,
suspension, and chassis
components for damage,
including cracks or tears in the
rubber boots, loose or missing
parts, or signs of wear at least
once a year. See Exterior Care
0 367. Lubricate the suspension
and steering components at
least every other oil change (if
equipped with grease fittings).
. Inspect power steering for
proper attachment, connections,
binding, leaks, cracks,
chafing, etc.
. Visually inspect halfshafts and
drive shafts for excessive wear,
lubricant leaks, and/or damage
including: tube dents or cracks,
constant velocity joint or
universal joint looseness,
cracked or missing boots, loose
or missing boot clamps, center
bearing excessive looseness,
loose or missing fasteners, and
axle seal leaks. .
Check restraint system
components. See Safety System
Check 071.
. 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 0367.
. Check starter switch. See Starter
Switch Check 0308.
. Check ignition transmission lock.
See Ignition Transmission Lock
Check 0308.
. Check parking brake and
automatic transmission park
mechanism. See Park Brake and
P (Park) Mechanism Check
0 309.
. Check accelerator pedal for
damage, high effort, or binding.
Replace if needed.
. Visually inspect gas strut for
signs of wear, cracks, or other
damage. Check the hold open ability of the strut. If the hold
open is low, service the gas
strut. See
Gas Strut(s) 0310.
. Inspect sunroof track and seal,
if equipped. See Sunroof044.
. Verify spare tire key lock
operation and lubricate as
needed. See Tire Changing
0 349.
. Visually inspect the spare tire to
ensure that it is tightly stowed
under the vehicle. Push, pull,
and try to turn the tire. If the
spare tire moves, tighten as
necessary. See Tire Changing
0 349.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13566587) - 2020 - CRC - 4/15/19
Index 429
Rear Axle (cont'd)Locking . . . . . . . . . . . . . . . . . . . . . . . 229
Rear Climate Control System . . . 179
Rear Seats . . . . . . . . . . . . . . . . . . . . . . 55 Heated . . . . . . . . . . . . . . . . . . . . . . . . . 55
Rear Storage . . . . . . . . . . . . . . . . . . . 110
Rear Vision Camera (RVC) . . . . . 242
Rear Window Washer/Wiper . . . . 118
Rearview Mirrors . . . . . . . . . . . . . . . . 41 Automatic Dimming . . . . . . . . . . . . . 41
Reclining Seatbacks . . . . . . . . . . . . . 50
Recommended Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Recommended Fluids and
Lubricants . . . . . . . . . . . . . . . . . . . . . 388
Records Maintenance . . . . . . . . . . . . . . . . . . 391
Recreational Vehicle Towing . . . . 364
Reimbursement Program,
GM Mobility . . . . . . . . . . . . . . . . . . . 399
Remote Keyless Entry (RKE) System . . . . . . . . . . . . . . 13, 16
Remote Vehicle Start . . . . . . . . . . . . 23
Replacement
Glass . . . . . . . . . . . . . . . . . . . . . . . . . 310
Replacement Parts Airbags . . . . . . . . . . . . . . . . . . . . . . . . . 86
Maintenance . . . . . . . . . . . . . . . . . . 390 Replacing Airbag System . . . . . . . . 86
Replacing LATCH System
Parts after a Crash . . . . . . . . . . . . 103
Replacing Seat Belt System Parts after a Crash . . . . . . . . . . . . . 72
Reporting Safety Defects Canadian Government . . . . . . . . 407
General Motors . . . . . . . . . . . . . . . 407
U.S. Government . . . . . . . . . . . . . 406
Restraints Where to Put . . . . . . . . . . . . . . . . . . . 92
Retained Accessory Power (RAP) . . . . . . . . . . . . . . . . . . 209
Reverse Tilt Mirrors . . . . . . . . . . . . . . 40
Ride Control Systems Magnetic . . . . . . . . . . . . . . . . . . . . . 229
Roads Driving, Wet . . . . . . . . . . . . . . . . . . 193
Roadside Assistance Program . . . . . . . . . . . . . . . . . . . . . . . 400
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . 44
Roof Rack System . . . . . . . . . . . . . . 112
Rotation, Tires . . . . . . . . . . . . . . . . . . 340
Routing, Engine Drive Belt . . . . . . 395
Running the Vehicle While Parked . . . . . . . . . . . . . . . . . . . . . . . . 212S
Safety Defects ReportingCanadian Government . . . . . . . . 407
General Motors . . . . . . . . . . . . . . . 407
U.S. Government . . . . . . . . . . . . . 406
Safety Locks . . . . . . . . . . . . . . . . . . . . . 26
Safety System Check . . . . . . . . . . . . 71
Scheduling Appointments . . . . . . . 401
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . 62 Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Extender . . . . . . . . . . . . . . . . . . . . . . . . 71
How to Wear Seat Belts
Properly . . . . . . . . . . . . . . . . . . . . . . . 63
Lap Belt . . . . . . . . . . . . . . . . . . . . . . . . 71
Lap-Shoulder Belt . . . . . . . . . . . . . . 65
Reminders . . . . . . . . . . . . . . . . . . . . 133
Replacing after a Crash . . . . . . . . 72
Use During Pregnancy . . . . . . . . . . 70
Seats
Center Seat . . . . . . . . . . . . . . . . . . . . 48
Head Restraints . . . . . . . . . . . . . . . . 47
Heated and Ventilated Front . . . . 54
Heated, Rear . . . . . . . . . . . . . . . . . . . 55
Lumbar Adjustment, Front . . . . . . 49
Memory . . . . . . . . . . . . . . . . . . . . . . . . . 51
Power Adjustment, Front . . . . . . . 48
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Reclining Seatbacks . . . . . . . . . . . . 50

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13566587) - 2020 - CRC - 4/15/19
430 Index
Seats (cont'd)Second Row . . . . . . . . . . . . . . . . . . . . 56
Third Row Seat . . . . . . . . . . . . . . . . . 60
Second Row Seats . . . . . . . . . . . . . . 56
Securing Child
Restraints . . . . . . . . . . .103, 105, 106
Security Light . . . . . . . . . . . . . . . . . . . . . . . . . . 143
OnStar . . . . . . . . . . . . . . . . . . . . . . . 412
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . 33
Vehicle Alarm . . . . . . . . . . . . . . . . . . . 33
Service . . . . . . . . . . . . . . . . . . . . . . . . . 182 Accessories andModifications . . . . . . . . . . . . . . . . 283
Doing Your Own Work . . . . . . . . 283
Maintenance Records . . . . . . . . 391
Maintenance, General Information . . . . . . . . . . . . . . . . . . 377
Parts Identification . . . . . . . . . . . . 392
Scheduling Appointments . . . . . 401
Services Special Application . . . . . . . . . . . 384
Servicing the Airbag . . . . . . . . . . . . . 84
Shift Lock Control Function
Check, Automatic
Transmission . . . . . . . . . . . . . . . . . . 308
Shifting Into Park . . . . . . . . . . . . . . . . . . . . . . 209 Shifting (cont'd)
Out of Park . . . . . . . . . . . . . . . . . . . 210
Side Blind Zone Alert (SBZA) . . . 249
Signals, Turn and Lane-Change . . . . . . . . . . . . . . . . . 169
Special Application Services . . . . 384
Specifications and Capacities . . . . . . . . . . . . . . . . . . . . . 393
Speedometer . . . . . . . . . . . . . . . . . . . 129
StabiliTrak
OFF Light . . . . . . . . . . . . . . . . . . . . . 140
Start Assist, Hill . . . . . . . . . . . . . . . . . 225
Start Vehicle, Remote . . . . . . . . . . . 23
Starter Switch Check . . . . . . . . . . . 308
Starting the Engine . . . . . . . . . . . . . 206
Steering . . . . . . . . . . . . . . . . . . . . . . . . 186 Heated Wheel . . . . . . . . . . . . . . . . .116
Wheel Adjustment . . . . . . . . . . . . .115
Wheel Controls . . . . . . . . . . . . . . . .116
Steering Column Lock . . . . . . . . . . . 35
Steps Power Assist . . . . . . . . . . . . . . . . . . . 32
Storage
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Storage Areas Armrest . . . . . . . . . . . . . . . . . . . . . . . .110
Center Console . . . . . . . . . . . . . . . .110
Convenience Net . . . . . . . . . . . . . .112 Storage Areas (cont'd)
Floor Console . . . . . . . . . . . . . . . . . 111
Glove Box . . . . . . . . . . . . . . . . . . . . 109
Roof Rack System . . . . . . . . . . . . .112
Sunglasses . . . . . . . . . . . . . . . . . . . .110
Storage Compartments . . . . . . . . . 109
Struts Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
Stuck Vehicle . . . . . . . . . . . . . . . . . . . 195
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . 43
Sunglass Storage . . . . . . . . . . . . . . . 110
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System
Forward CollisionAlert (FCA) . . . . . . . . . . . . . . . . . . 245
Infotainment . . . . . . . . . . . . . 174, 409
Noise Control . . . . . . . . . . . . . . . . . 306
Roof Rack . . . . . . . . . . . . . . . . . . . . .112
Systems Driver Assistance . . . . . . . . . . . . . 240
T
Tachometer . . . . . . . . . . . . . . . . . . . . . 129
Text Telephone (TTY) Users . . . . 399
Theft-Deterrent Systems . . . . . . . . . 36Immobilizer . . . . . . . . . . . . . . . . . . . . . 36
Third-Row Seats . . . . . . . . . . . . . . . . . 60