The follow video shows step by step instructions on how to perform this procedure. Instruction on how to replace the valve body on 722.9 7-Speed transmission, are generally the same as on the 5-Speed automatic transmission. This unit can then be “married” to any Mercedes-Benz using Star Diagnostic C3 or C4 scanner. There are facilities that can take a used TCU and make it virgin again by erasing the information of the previous vehicle. This requires that you purchase the replacement parts from the dealer. In the 722.9 transmissions, the TCU is on top of the conductor plate. What that means is that the TCU can not be from a used car.
Replacing the valve body on a 722.9xx requires that the TCU be “virgin” and be “married” to your car. Replacing the valve body on the 722.9 7G Tronic. Engine RPMs are high but car doesn’t move.Transmission, will not shift into higher gears.Shifts from first to second gear then it stays in that gear.Typically when the valve body or conductor plate fail you may experience the following symptoms: A TRP paperwork needs to be completed which has the owner information and details on the vehicle such as VIN number and vehicle log reports. With the problem becoming much more common it is our understanding that Mercedes-Benz will now sell those parts to independent shops. In reality, all that was happening is that dealer had the unfair advantage of being the only one who can repair these cars, while independent repair shops were limited at being able to fix these cars. Mercedes-Benz claims that they will not sell the valve body because it could aid in automobile theft. Yet they will sell complete transmissions. Unfortunately, Mercedes-Benz declined to sell replacement valve bodies to independent repair shops claiming that these components were related to the security of the vehicle.
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