WARNING:  Always fully apply the parking brake. Make sure you shift into park (P) for vehicles with an automatic transmission. Switch the ignition off and remove the key whenever you leave your vehicle.
  WARNING:  Do not apply the brake pedal and accelerator pedal simultaneously. Applying both pedals simultaneously for more than a few seconds will limit engine performance, which may result in difficulty maintaining speed in traffic and could lead to serious injury.

Note:  Under certain conditions, you may not be able to shift out of park (P) unless the intelligent access key is inside the vehicle.
Understanding your SelectShift™ Automatic Transmission
Your vehicle is equipped with a SelectShift automatic transmission gearshift lever and steering wheel mounted shifter paddles. The buttons on the gearshift lever and the shifter paddles serve the same functions. The SelectShift Automatic transmission gives you the ability to change gears up or down (without a clutch) as desired.
In order to prevent the engine from running at too low an RPM, which may cause it to stall, SelectShift still automatically makes some downshifts if it has determined that you have not downshifted in time. Although SelectShift will make some downshifts for you, it still allows you to downshift at any time as long as the SelectShift determines that damage will not be caused to the engine from over-revving.
SelectShift will not automatically upshift, even if the engine is approaching the RPM limit. It must be shifted manually by pressing the + button or paddle.
Note:  Engine damage may occur if you maintain excessive engine revving without shifting.
The SelectShift Automatic transmission feature has two modes: PRS and M mode.
Manual (M)
Moving the gearshift lever to the manual (M) position allows you to manually select the gear you desire. Only the current gear will display. Use the buttons on the gearshift lever or steering wheel to manually select gears. Press the + button or paddle to upshift or the button or paddle to downshift. Return the transmission to a different gearshift position to deactivate manual control.
Console Shifter
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Steering Wheel
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Upshift to the recommended shift speeds according to the following chart:

Upshifts When Accelerating (Recommended for Best Fuel Economy)  
Shift from:  
1 – 2   15 mph (24 km/h)
2 – 3   20 mph (32 km/h)
3 – 4   27 mph (43 km/h)
4 – 5   32 mph (51 km/h)
5 – 6   37 mph (60 km/h)
6 – 7   42 mph (68 km/h)
7 – 8   48 mph (77 km/h)
8 – 9   52 mph (84 km/h)
9 – 10   60 mph (97 km/h)

Progressive Range Selection
Progressive Range Selection gives you the ability to lockout gears from the automatic shifting range. This may provide you with an improved driving experience (for example, in slippery conditions or when experiencing a steep grade).
With the transmission in drive (D), press the button or paddle to activate PRS. The available and selected gears are indicated on the instrument cluster.
All available gears display with the current gear indicated. Press the button or paddle again to lock out gears beginning with the highest gear. For example, press the button or paddle twice to lock out 10th and 9th gears. Only the available gears display and the transmission automatically shifts between the available gears. Press the + button or paddle to unlock gears to allow the transmission to shift to higher gears. The transmission shifts automatically within the gear range you select.