Climbing A Grade
CLIMBING A GRADEDESCRIPTION
When climbing a grade the interactive speed control tries to maintain the set speed by increasing the throttle opening, while inhibiting/delaying downshifts.
OPERATION
If opening the throttle alone cannot maintain the set speed and the vehicle speed drops more than three mph below the set speed, the transmission will downshift to third gear. If the vehicle continues to lose speed, by more than 6 mph, the transmission will downshift again to maintain the set speed. After the vehicle encounters a less-steep grade, or has crested the grade (reduced the load on the powertrain) and can maintain the set speed at a reduced throttle position, the transmission will upshift, as appropriate, until the set speed can be maintained in Overdrive.