Medium and Heavy Trucks
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Hi, my name is Doug.
The SM is for system malfunction
There is no EE but there is an EF which means the display line between the main transmission control unit (main TCU) and the ZF-FreedomLine transmission electronic controller (ZMTEC) is faulty. It sound like you need a new transmission harness to make it work.
Do you have any trans codes like numbers and some times letters elsewhere on cluster?