2008 GMC YUKON XL lane assist

Hill and Mountain Roads
Driving on steep hills or through mountains is different
than driving on at or rolling terrain. Tips for driving
in these conditions include:
Keep your vehicle serviced and in good shape.
Check all uid levels and brakes, tires, cooling
system, and transmission.
Going down steep or long hills, shift to a lower gear.
{CAUTION:
If you do not shift down, the brakes could get
so hot that they would not work well. You
would then have poor braking or even none
going down a hill. You could crash. Shift down
to let the engine assist the brakes on a steep
downhill slope.
{CAUTION:
Coasting downhill in NEUTRAL (N) or with the
ignition off is dangerous. The brakes will have
to do all the work of slowing down and they
could get so hot that they would not work well.
You would then have poor braking or even
none going down a hill. You could crash.
Always have the engine running and your
vehicle in gear when you go downhill.
Stay in your own lane. Do not swing wide or cut
across the center of the road. Drive at speeds
that let you stay in your own lane.
Top of hills: Be alert — something could be in your
lane (stalled car, accident).
Pay attention to special road signs (falling rocks
area, winding roads, long grades, passing or
no-passing zones) and take appropriate action.
SeeOff-Road Driving on page 4-13for information
about driving off-road.
4-29

Tires (cont.)
Removing the Spare Tire and Tools...............5-90
Secondary Latch System............................5-100
Spare Tire................................................5-107
Storing a Flat or Spare Tire and Tools..........5-103
Tire Sidewall Labeling..................................5-65
Tire Terminology and Denitions....................5-69
Uniform Tire Quality Grading.........................5-83
Wheel Alignment and Tire Balance.................5-84
Wheel Replacement.....................................5-85
When It Is Time for New Tires......................5-80
Tow/Haul Mode...............................................2-37
Tow/Haul Mode Light.......................................3-53
Towing
Recreational Vehicle.....................................4-45
Towing a Trailer..........................................4-49
Your Vehicle...............................................4-45
Traction
StabiliTrak
®System....................................... 4-6
Trailer
Recommendations.......................................4-63
Transmission
Fluid, Automatic..................................5-22, 5-24
Transmission Operation, Automatic....................2-31
Trip Odometer................................................3-39
Turn and Lane-Change Signals.......................... 3-8
Turn Signal/Multifunction Lever........................... 3-7
U
Ultrasonic Rear Parking Assist (URPA)...............2-58
Uniform Tire Quality Grading............................5-83
Universal Home Remote System.......................2-64
Operation...................................................2-64
Using this Manual............................................... iii
V
Vehicle
Control........................................................ 4-3
Damage Warnings........................................... iv
Loading......................................................4-35
Symbols......................................................... iv
Vehicle Customization, DIC..............................3-72
Vehicle Data Recording and Privacy..................7-16
Vehicle Identication
Number (VIN)............................................5-116
Service Parts Identication Label..................5-116
Vehicle, Remote Start....................................... 2-8
Ventilation Adjustment......................................3-33
Visors...........................................................2-21
Voltmeter Gage..............................................3-44
13