GMC 2012 Sierra Denali Owner's Manual page 276

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Shifts may be more noticeable with
a cold transmission. This difference
in shifting is normal.
This position
lets drivers select the range of gears
appropriate for current driving
conditions. See Range Selection
Mode under
.
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 compare
key shift parameters to pre
programmed ideal shift conditions
stored in the transmission's
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.
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.
When in M (Manual Mode) a number
displays next to the M, indicating the
current gear that has been selected.
The number displayed in the gear
indicator is the highest gear that can
be used.

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