Okay, Well this is how it works you could use 722.9 trans fluid in 722.6 but you cant you use 722.6 fluid in the new 722.9 trans. You could reset trans adaptions but you would need a SDS/DAS to do that. When replacing the module you would have to perform an initial start up procedure but since your not replacing it you don't have to do that. If you have an external leak at the Trans connector on the transmission you could replace that. You could just clean it out with electrical cleaner. You will find fluid at the Trans round electrical connector on the transmission but don't be alarmed they all have fluid in them. As for the TCM you could inspect the connector for signs of fluid but I would bet you wont find anything wrong with it or find fluid. I would start there for sure and get some new fluid and filter. So you said that you didn't use MB approved trans fluid. The Conductor plate sits above your valve body and is usually the main cause of all shifting problems unless your clutches are slipping (you will defiantly know if your clutches are slipping). Most of the time what happens is when you have shifting problems (or limp home mode) its your input and output speed sensors shorting out in the conductor plate due to the clutch material in the fluid. ![]() At the dealer we only replace the Electronic Transmission control unit if it has a fault for the control unit being defective. Well what it sounds like to me is your Conductor plate above your valve body.
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