2002 GMC Safari Owner's Manual - Page 218

Tow/Haul Mode The tow/haul mode is a feature that assists when pulling a heavy trailer. The purpose of the tow/haul mode is: D to reduce the frequency of shifts when pulling a heavy trailer. The tow/haul mode is most effective when the vehicle and trailer combined weight is at least 75% of the Gross Vehicle Weight Rating (GVWR) and the maximum trailer weight rating for the vehicle. See "Gross Vehicle Weight Rating" and "Trailer Weight" in the Index. The tow/haul mode for hauling a heavy trailer is most useful under the following conditions: D to provide the same shift feel when pulling a heavy trailer as when the vehicle is unloaded. pulling a heavy trailer. D to reduce the need to change throttle position when This feature is turned on or off by pressing a button on the column shift lever. When the feature is on, a light on the instrument panel will illuminate to indicate that the tow/haul mode has been selected. See "Tow/Haul Mode Light" in the Index. The tow/haul mode is automatically turned off each time the vehicle is started. D When driving through hilly terrain at speeds below 55 mph (88 km/h). D When driving in low speed or stop and go traffic below 55 mph (88 km/h). D When driving in parking lots. Operating in the tow/haul mode when not pulling a heavy trailer will not cause damage to the vehicle, but you may experience reduced fuel economy and undesirable performance from the engine and transmission. The tow/haul mode should be used only when pulling a heavy trailer. 4-33