2011 Mercedes GL-Class Owner's Manual - Page 252

250 Display messages Display messages Tire Pressure Monitor Currently Unavailable Possible causes/consequences and M Solutions Due to a source of radio interference no signals can be received from the wheel sensors. The tire pressure monitor is temporarily malfunctioning. X Drive on. The TPMS restarts automatically as soon as the problem has been solved. On-board computer and displays h Tire Pressure Caution: Tire Defect G Risk of accident The tire pressure in one or more tires has dropped suddenly. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so. X If necessary, change the wheel (Y page 350). h Tire Pressure Check Tires G Risk of accident The tire pressure in one or more tires has dropped significantly. X Stop the vehicle without making any sudden steering or braking maneuvers. Pay attention to the traffic conditions as you do so. X If necessary, change the wheel (Y page 350). X Check the tire pressure. If necessary, correct the tire pressure (Y page 341). The tire pressure is insufficient in at least one of the tires or the tire pressure difference between the wheels is too great. X Check the tire pressures at the next opportunity. If necessary, correct the tire pressure (Y page 341). h Please correct the tire pressures Vehicle Display messages Shift to P or N to start engine Auxiliary Battery Malfunction Depress brake to shift out of P Possible causes/consequences and M Solutions You have attempted to start the engine with the transmission in position R or D. X Shift the transmission to position P or N. The auxiliary battery for the automatic transmission is no longer being charged. X Visit a qualified specialist workshop. You have attempted to move the transmission selector lever to position D, R or N without depressing the brake pedal. X Depress the brake pedal.