2008 Jeep Grand Cherokee Owner's Manual - Page 150

150 UNDERSTANDING THE FEATURES OF YOUR VEHICLE and will only activate when the vehicle is descending a hill. It will usually not activate on level ground. The HDC speed may be adjusted by the driver to suit the driving conditions. The speed corresponds to the transmission gear selected. • 1st = 1 mph (1.6 km/h) • 2nd = 2.5 mph (4 km/h) • 3rd = 4 mph (6 km/h) • 4th = 5.5 mph (9 km/h) • 5th = 7.5 mph (12 km/h) • Reverse (R) = 1 mph (1.6 km/h) • Neutral (N) = 2.5 mph (4 km/h) • Park (P) - HDC will not function HDC also has the capability to sense rough terrain, and will automatically adjust to a slightly slower set speed (about.3 mph (.5 km/h) than normal. HDC operation can be overridden with brake application to slow the vehicle down below the HDC control speed. Conversely, if more speed is desired during HDC control, the accelerator pedal will increase vehicle speed in the usual manner. When either the brake or the accelerator is released, HDC will control the vehicle back to the original set speed. HDC is intended for low speed off-road driving only. At vehicle speeds above 30 mph (48 km/h), HDC will no longer function. When the vehicle speed drops below 30 mph (48 km/h), HDC function will automatically resume and the vehicle speed will return to the chosen set speed.