2010 Mercedes GL-Class Owner's Manual - Page 120

118 Automatic transmission Rocking the vehicle Rocking the vehicle by shifting the automatic transmission directly between drive position D and reverse gear R can help free a vehicle stuck in mud or snow. The engine control system of this vehicle electronically limits directly shifting the automatic transmission between drive position D and reverse gear R to very low speeds, i.e. approximately 5 mph (9 km/h). To shift the automatic transmission directly between drive position D and reverse gear R, move the gear selector lever up or down past the resistance point. The current gear range appears in the multifunction display. Controls in detail : Gear range indicator Effect = With this selection you can use the braking effect of the engine. 5 Allows the use of the engine's braking effect when driving Ron steep downgrades Rin Working on the vehicle G Warning! When working on the vehicle, engage the parking brake and shift the automatic transmission into park position P. Otherwise the vehicle could roll away which could result in an accident and/or serious personal injury. Towing a trailer X mountainous regions Runder extreme operating conditions When you tow a trailer, shift into a lower gear range manually if the automatic transmission hunts between gears on inclines. A lower gear range and reduction of speed reduces the potential to overload or to overheat the engine. For more information on trailer towing, see "Trailer towing" (Y page 269). 4 For maximum use of the engine's braking effect on very steep or lengthy downgrades. One-touch gearshifting With the automatic transmission in drive position D, you can limit or extend the gear range using the steering wheel gearshift control. Gear ranges With the automatic transmission in drive position D, you can limit or extend the gear range, see "One-touch gearshifting" (Y page 118). Steering wheel gearshift control