Manual Mode - GMC Yukon XL Denali Owner's Manual

9-30 Driving and Operating
When temperatures are very cold,
®
the Hydra-Matic automatic
transmission's gear shifting may be
delayed providing more stable shifts
until the engine warms up. Shifts
may be more noticeable with a cold
transmission. This difference in
shifting is normal.
M (Manual Mode): This position
lets drivers select the range of gears
appropriate for current driving
conditions. See Range Selection
Mode under Manual Mode on
page 9 30.
Notice: Spinning the tires or
holding the vehicle in one place
on a hill using only the
accelerator pedal may damage
the transmission. The repair will
not be covered by the vehicle
warranty. If you are stuck, do not
spin the tires. When stopping on
a hill, use the brakes to hold the
vehicle in place.
The vehicle has a shift stabilization
feature that adjusts the transmission
shifting to the current driving
conditions in order to reduce rapid
upshifts and downshifts. This shift
stabilization feature is designed to
determine, before making an
upshift, if the engine will be able to
maintain vehicle speed by analyzing
things such as throttle position,
vehicle load, and hill grade. If the
shift stabilization feature determines
that a current vehicle speed cannot
be maintained, the transmission
does not upshift and instead holds
the current gear. In some cases, this
may appear to be a delayed shift,
however the transmission is
operating normally.
The vehicle's transmission uses
adaptive shift controls. Adaptive
shift controls continually compares
key shift parameters to pre
programmed ideal shift conditions
stored in the transmissions
computer. The transmission
constantly makes adjustments to
improve vehicle performance
according to the way the vehicle is
being used, such as with a heavy
load. During this adaptive shift
controls process, some shifts may
feel different as the transmission
determines the best settings for a
particular shift.

Manual Mode

Range Selection Mode
On vehicles with a Range Selection
Mode, this feature may be used to
control the vehicle's transmission.
To use this feature, do the following:
1. Move the shift lever to
M (Manual Mode).
2. Press the plus/minus buttons to
upshift or downshift, selecting
the desired range of gears for
current driving conditions.