GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - CRC - 2/18/20
226
Driving and Operating
Warning (Continued)
.
Never stack heavier things, like
suitcases, inside the vehicle so
that some of them are above the
tops of the seats.
.
Do not leave an unsecured child
restraint in the vehicle.
.
When you carry something inside
the vehicle, secure it whenever
you can.
.
Do not leave a seat folded down
unless you need to.
There is also important loading
information for off-road driving in this
manual. See
“
Loading Your Vehicle for
Off-Road Driving
”
under
Starting and Operating
New Vehicle Break-In
Caution
The vehicle does not need an elaborate
break-in. But it will perform better in the
long run if you follow these guidelines:
.
Keep the vehicle speed at 88 km/h
(55 mph) or less for the first 805 km
(500 mi).
.
Do not drive at any one constant
speed, fast or slow, for the first
805 km (500 mi). Do not make
full-throttle starts. Avoid downshifting
to brake or slow the vehicle.
.
Avoid making hard stops for the first
322 km (200 mi) or so. During this
time the new brake linings are not yet
broken in. Hard stops with new linings
can mean premature wear and earlier
replacement. Follow this breaking-in
guideline every time you get new
brake linings.
(Continued)
Caution (Continued)
.
Do not tow a trailer during break-in.
See
for the
trailer towing capabilities of the
vehicle and more information.
Following break-in, engine speed and load
can be gradually increased.
Ignition Positions
Vehicles equipped with Keyless Access have
pushbutton starting.
The Remote Key must be in the vehicle for
the system to operate. If the pushbutton
start is not working, the vehicle may be
near a strong radio antenna signal causing
