RAM 2500 2021 Owner's Manual page 203

Cruise Control Buttons
1 — On/Off Button
2 — CANCEL
3 — RES (+)
4 — SET (-)
NOTE:
In order to ensure proper operation, the Cruise
Control system has been designed to shut down
if multiple Cruise Control functions are operated
at the same time. If this occurs, the Cruise
Control system can be reactivated by pushing
the Cruise Control on/off button and resetting
the desired vehicle set speed.
To Activate
Push the on/off button to activate the Cruise
Control. The cruise indicator light in the
instrument cluster display will illuminate. To
turn the system off, push the on/off button a
second time. The cruise indicator light will turn
off. The system should be turned off when not in
use.
WARNING!
Leaving the Cruise Control system on when
not in use is dangerous. You could
accidentally set the system or cause it to go
faster than you want. You could lose control
and have an accident. Always leave the
system off when you are not using it.
To Set A Desired Speed
Turn the Cruise Control on. When the vehicle
has reached the desired speed, push the SET (-)
button and release. Release the accelerator
and the vehicle will operate at the selected
speed. Once a speed has been set, a message
"CRUISE CONTROL SET TO MPH (km/h)" will
appear indicating the set speed. A cruise
STARTING AND OPERATING
indicator light, along with set speed will also
appear and stay on in the instrument cluster
display when the speed is set.
NOTE:
The vehicle should be traveling at a steady
speed and on level ground before pushing the
SET (-) button.
To Vary The Speed Setting
To Increase Or Decrease The Set Speed
When Cruise Control is set, you can increase the
speed by pushing the RES (+) button, or
decrease speed by pushing the SET (-) button.
U.S. Speed (mph)
Pushing the RES (+) button, or SET (-) button

once will result in a 1 mph speed adjustment.
Each subsequent tap of the button results in
an adjustment of 1 mph.
If the button is continually pushed, the set

speed will continue to adjust until the button
is released, then the new set speed will be
established.
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