2003 Hummer H2 Owner's Manual - Page 289

Your vehicle is equipped with a button on the instrument panel, to the right of the steering wheel, which when pressed enables tow/haul. Tow/haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle's Gross Combination Weight Rating (GCWR). See "Weight of the Trailer" later in this section. Tow/haul is most useful under the following driving conditions: D When pulling a heavy trailer or a large or heavy load through rolling terrain. in stop and go traffic. D When pulling a heavy trailer or a large or heavy load When the button is pressed, this light on the instrument panel will illuminate to indicate that tow/haul has been selected. D When pulling a heavy trailer or a large or heavy load in busy parking lots where improved low speed control of the vehicle is desired. Operating the vehicle in tow/haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of tow/haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/haul is recommended only when pulling a heavy trailer or a large or heavy load. Tow/haul may be turned off by pressing the button again, at which time the indicator light on the instrument panel will turn off. The vehicle will automatically turn off tow/haul every time it is started. 4-61