Cruise Control
With cruise control a speed of about 40 km/h (25 mph) or more can be maintained without keeping your foot on the accelerator. Cruise control does not work at speeds below about 40 km/h (25 mph).
If equipped with an Allison or Hydra-Matic 6-speed automatic transmission, see “Tow/Haul Mode Grade Braking” under Tow/Haul Mode 0 261 for an explanation of
how cruise control interacts with the Range Selection Mode, Tow/Haul Mode, and Grade Braking systems.
If the cruise control is being used and the Traction Control System (TCS) or StabiliTrak/Electronic Stability Control (ESC) begins to limit wheel spin, the cruise control will automatically disengage. See Traction Control/Electronic Stability Control 0 273. When road conditions allow you to safely use it again, cruise control can be turned back on.
If the brakes are applied, cruise control disengages.
5 : Press to turn the system on or off. The indicator light is white when
cruise control is on and turns off when cruise control is off.
+RES : If there is a set speed in memory, press briefly to resume to that speed or press and hold to accelerate. If cruise control is already active, use to increase vehicle speed.
SET− : Press briefly to set the speed and activate cruise control. If cruise control is already active, use to decrease vehicle speed.
* : Press to disengage cruise control without erasing the set speed from memory.
Setting Cruise Control
If 5 is on when not in use, SET− or
+RES could get pressed and go into cruise when not desired. Keep 5 off when cruise is not being used.
The cruise control indicator on the instrument cluster turns green after cruise control has been set to the desired speed. See Instrument Cluster 0 136.
Resuming a Set Speed
If the cruise control is set at a desired speed and then the brakes are applied or * is pressed, the cruise control is disengaged without erasing the set speed from memory.
Once the vehicle speed reaches about 40 km/h (25 mph) or more, briefly press +RES. The vehicle returns to the previous set speed.
Increasing Speed While Using Cruise Control
If the cruise control system is already activated:
+RES. For each press, the vehicle goes about 1 km/h (1 mph) faster.
The speedometer reading can be displayed in either English or metric units. See Instrument Cluster 0 136. The increment value used depends on the units displayed.
Reducing Speed While Using Cruise Control
If the cruise control system is already activated:
The speedometer reading can be displayed in either English or metric units. See Instrument Cluster 0 136. The increment value used depends on the units displayed.
Passing Another Vehicle While Using Cruise Control
Use the accelerator pedal to increase the vehicle speed. When you take your foot off the pedal, the vehicle will slow down to the previous set cruise speed. While pressing the accelerator pedal or shortly following the release to override cruise control, briefly pressing SET– will result in cruise control set to the current vehicle speed.
Using Cruise Control on Hills
How well the cruise control works on hills depends on the vehicle speed, the load, and the steepness of the hills. When going up steep hills, pressing the accelerator pedal may be necessary to maintain vehicle speed.
While going downhill:
. Vehicles with a 6-speed automatic transmission and a gasoline engine have Cruise Grade Braking to help maintain driver selected speed.
Cruise Grade Braking is enabled when the vehicle is started and cruise control is active. It is not enabled in Range Selection Mode. It assists in maintaining driver selected speed when driving on downhill grades by using the engine and transmission to slow the vehicle.
To disable and enable Cruise Grade Braking for the current ignition key cycle, press and hold the Tow/Haul button for five seconds. A DIC message
displays. See Vehicle Messages
0 159.
or both are on.
For other forms of descent control, see Hill Descent Control (HDC)
0 275, Automatic Transmission
0 256, and Tow/Haul Mode 0 261.
Ending Cruise Control
There are four ways to end cruise control:
Erasing Speed Memory
The cruise control set speed is erased from memory if 5 is pressed or the ignition is turned off.
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