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Dash bord with gears dissapeared!!!!!!Help

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My dashbord with the 6 speeds on my cayenne turbo s 2003 dissapeared(blank screen),,,,,the car is in limp mode and the pwis is telling me is telling me a message that is the tiptronic control module,tcu...i checked every fuse...I removed de TCU from the passanger seat,clean it up and also borrow a 2nd hand one from a cayenne 4.5 ,no result blank screen,,,,my version of tcu is 09d927750aa

and I replaced it for a test with a 09D927750AG software version S0310,btw PSM in diagnostic mode....and car is going only in 3rd gear think and R only making a BIG clunch sound when using the selector..it's running on reduce power and I cant see my speeds on display!!!!DO i need A virgin TCU tiptronic control unit!???so it can comunicate with my ECU!?The big problem is that nither PIWIS 2 3 cannot comunicate with the ecu it gives error OF SERIAL LINK Comunication on engine!!I repleced the battery reset the steering angle sensor!Tried everyting!!!Any ideea!?Thank you!

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