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Black plate (37,1)
GMC 2015i Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
8431499) - 2015 - CRC - 6/20/14
Driving and Operating
9-37
For example, when M5 is selected,
1 (First) through 5 (Fifth) gears are
automatically shifted by the
transmission, but 6 (Sixth) cannot
be used until the plus/minus button
on the shift lever is used to change
to the range.
In vehicles with gasoline engines,
when the shift lever is moved from
D (Drive) to M (Manual Mode), a
downshift may occur. The gear that
the transmission is operating in
when the shift lever is moved from
D (Drive) to M (Manual Mode)
determines if a downshift occurs.
See the following chart.
6
–
Speed Automatic Transmission
Gear before shifting from D
(Drive) to M (Manual Mode)
6th
5th
4th
3rd
2nd
1st
Range after shifting from D
(Drive) to M (Manual Mode)
M4
M4
M3
M2
M2
M1
8
–
Speed Automatic Transmission
Gear before
shifting from D
(Drive) to M
(Manual Mode)
8th
7th
6th
5th
4th
3rd
2nd
1st
Range after
shifting from
D (Drive) to
M (Manual Mode)
–
Tow/Haul not
engaged
M6
M6
M5
M4
M3
M3
M2
M1
Range after
shifting from
D (Drive) to
M (Manual Mode)
–
Tow/Haul
engaged
M6
M5
M4
M3
M3
M3
M2
M1