2010 Mercedes GL-Class Owner's Manual - Page 121
2010 Mercedes GL-Class Manual
Page 121 highlights
Transfer case i You cannot shift with the steering wheel gearshift control when the automatic transmission is in park position P, neutral position N, or reverse gear R. Limiting gear range G Warning! On slippery road surfaces, never downshift in order to obtain braking action. This could result in drive wheel slip and reduced vehicle control. Your vehicle's ABS will not prevent this type of loss of control. X 119 Shifting into optimal gear range X Pull and hold left gearshift control :. The automatic transmission will select the gear range suited for optimal acceleration and deceleration automatically. This will involve shifting down one or more gears. Emergency operation (limp-home mode) If vehicle acceleration becomes less responsive or sluggish or the automatic transmission no longer shifts, the automatic transmission is most likely operating in limphome (emergency operation) mode. In this mode only second gear and reverse gear R can be selected. X Stop the vehicle in a safe location. X Shift the automatic transmission into park position P. X Turn off the engine. X Wait at least 10 seconds before restarting. X Restart the engine. X Shift the automatic transmission into drive position D (for second gear) or reverse gear R. X Have the automatic transmission checked at an authorized Mercedes-Benz Center as soon as possible. Briefly pull left gearshift control :. The automatic transmission will shift into the next lower gear as permitted by the shift program. This action simultaneously limits the gear range of the automatic transmission. i To avoid overrevving the engine when downshifting, the automatic transmission will not shift into a lower gear if the engine's maximum speed would be exceeded. Extending gear range X Briefly pull right gearshift control ;. The automatic transmission will shift into the next higher gear as permitted by the shift program. This action simultaneously extends the gear range of the automatic transmission. i If you press on the accelerator pedal when the engine has reached the revolution limit of the current gear range, the automatic transmission will upshift beyond any gear range limit selected. Canceling gear range limit X Transfer case The vehicle is equipped with all-wheel drive (4MATIC). Both the front and rear axles are powered at all times when the vehicle is being operated. Pull and hold right gearshift control ; until the gear range indicator disappears from the multifunction display. The automatic transmission will shift from the current gear range directly into drive position D. ! Only conduct operational or performance tests on a two-axle dynamometer. If such tests are necessary, contact an authorized Mercedes-Benz Center. You could otherwise seriously damage the brake system or the transfer case which is not Z Controls in detail