Jeep 2009 Grand Cherokee, Owner'S Manual, Page: 321 / 521

WARNING!
With the ESP switched off, the enhanced vehicle
stability offered by ESP and ERM are unavailable. In
an emergency evasive maneuver, the ESP and ERM
systems will not engage to assist in maintaining
stability. The “Full Off” ESP mode is intended for
off-road use only.
4WD Low Range
Full Off
This is the normal operating mode for ESP in 4WD LOW
range. Whenever the vehicle is started in 4WD LOW
range, or the transfer case (if equipped) is shifted from
4WD HIGH range or NEUTRAL to 4WD LOW range, the
ESP system will be in this “Full Off” mode. In 4WD LOW
range, ESP 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 normal ESP stability function returns but
TCS remains off. When the vehicle speed drops below
35 mph (56 km/h), the ESP system shuts off. ESP is
deactivated at low vehicle speeds in 4WD LOW range so
that it will not interfere with off-road driving but ESP
function returns to provide the stability feature at speeds
above 40 mph (64 km/h). The ESP/TCS Indicator Light
will always be illuminated in 4WD LOW range when ESP
is off.
NOTE: The “ESP OFF” message will display, and the
audible chime will sound, when the shift lever is placed
in the PARK position from any other position, and then
moved out of the PARK position. This will occur even if
the message was previously cleared
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