Brokendownbutgood,
This is from my 2016 Owners Manual
All Ram Two-Wheel Drive Vehicles And Four-Wheel Drive Vehicles In 2WD, 4WD AUTO, Or 4WD LOCK Modes Can Choose The following ESC Operating Modes:
ESC On
This is the normal operating mode for ESC in 2WD/4WD AUTO/4WD LOCK modes and in 2WD vehicles. This mode should be used for almost all driving situations. ESC should only be turned to “Partial Off” or “ESC Off” for specific reasons as noted below.
ESC Partial Off
This mode is entered by momentarily pressing the “ESC Off” switch. When in Partial Off mode, the TCS portion of ESC, except for the “limited slip” feature described in the TCS section, has been disabled and the "ESC Off Indicator Light" will be illuminated. All other stability features of ESC function normally. This mode is intended to be used if the vehicle is in deep snow, sand, or gravel conditions and more wheel spin than TCS would normally allow is required to gain traction. To turn ESC on again, momentarily press the “ESC Off” switch. This will restore the normal “ESC On” mode of operation.
This Is the ESC operating mode in 4WD LOW:
ESC Full Off
This mode is intended for off-road use when ESC stability features could inhibit vehicle maneuverability due to trail conditions. This mode is entered by pressing and holding the “ESC Off” switch for five seconds WHEN THE VEHICLE IS STOPPED and the engine is running. After five seconds, the “ESC Off Indicator Light” will illuminate and the “ESC Off” message will appear in the odometer. ESC and TCS except for the “limited slip” feature described in the TCS section are turned off until the vehicle reaches a speed of 40 mph (64 km/h). At 40 mph (64 km/h) the system returns to “Partial Off” mode.
JFJ Note: “ESC Off” switch is their term for the truck's Traction Control switch