Repair Mercedes R-Class 2006-2008 | TCU 7G Tronic Siemens VDO 722.9

The 7G-Tronic seven- speed automatic gearbox (or 722.9 transmission ECU) is fitted to the Mercedes R-Class between model years 2006 and 2008. Problems with this ECU are very common and can cause poor shifting or a complete lack of gear selection. When scanning with diagnostic equipment, a variety of different error codes may be present depending on the type of fault. In some cases, communication is not possible at all. Some of the most common error codes are: 0717 – The Signal From Component Y3/8N1 (Turbine Speed Sensor, VGS) Is Not Available, 0718 – The Component Y3/8N1 (Turbine Speed Sensor, VGS) Is Defective, 2201 – The Component Y3 /8N2 (Internal Speed Sensor) is Defective. Many of these problems can be solved by repairing the transmission module.