Jeep 2013 Grand Cherokee - Owner Manual - Manual (Page 506)

Hill Descent Control (HDC) — Four-Wheel Drive
Models With MP3023 Two-Speed Transfer Case
Only
HDC maintains vehicle speed while descending hills
during off-road driving situations and is available in
4WD LOW range only. To enable HDC, press the HDC
switch or put the Selec-Terrain™ system in “ROCK”
mode (“ROCK” mode is only available in 4WD LOW
range).
When HDC is enabled, the HDC icon will be illuminated
in the instrument cluster. HDC will automatically apply
the brakes to control downhill speed to the selected level
when necessary on grades greater than approximately
8%. It will usually not activate on level ground.
Hill Descent Switch
504 STARTING AND OPERATING