2004 Mercedes-Benz c320 4Matic
The way the unit works is you can select OBD2 or Scan and the scan will grab the vin and then walk you through a couple of steps like the year range of the vehicle and left or right steering wheel. Then it scans both the transmission and the engine. The first set of codes were listed under STORED in the transmission section. All of them were actually stored. After it scanned the transmission it actually said no faults but once I clicked into it I saw all the stored codes.I am not familiar with the Autel unit, but there should be a way to tell it to scan the TCU. Some of those codes you posted do appear to be TCU related:
This may be a bad shifter unit based on some of those codes. You should definitely align the shifter linkage rod. And while you're under there, check the 13-pin electrical connector on the transmission for any signs of oil leakage. Disconnect it and check for oil inside the connections as well as for oil in the wiring harness itself. Finally, check the TCU for oil intrusion. It's located in the passenger footwell, Fold the carpet down from under the dash, remove the sound insulation panel, and there is a metal "cage" that contains the TCU. It has three plastic nuts holding the cage to the body.
I've already looked at the TCU before when I was searching for the ECU when I started having all these issues and from what I remember it looked brand new behind the carpet. No water damage or anything looked great I'll check it again just to reassure myself on that. I'll pull it up on my car ramps in a little while and check the 13-pin connector to see if it's okay also. I don't really have anyone to help me adjust the linkage so that's one reason why I haven't. If you unbolt the shifter it moves about 1 full inch so I just kept adjusting it and shifting through all the gears till it felt the best and I stuck with that. Since then I've only had those couple of issues. I don't really feel its necessary to adjust it on the rod when the whole shifter moves it should be easier to just adjust it with the entire shifter. Which is what I did just from feel.
One thing I have noticed is since I've adjusted this shifter I no longer have the issue where sometimes randomly I'll be driving the car down the interstate and I lose the speedometer and my cruse turns off and the transmission locks into gear as it goes into limp mode or something. Sometimes it would lock in high gear till I slow down and it downshifts then it would lock into 1st gear and not shift anymore. Sometimes it would lock into high gear and when I would take off from a dead stop it would bog down really bad and take off really slow till it catches up to speed. This hasn't happened again since I adjusted the shifter I took the car on a 2.5-hour trip yesterday and drove great then drove it back the same night and it drove great no issues at all for this entire trip. So whatever was causing that somehow got fixed with the adjustment so I wanted to mention that too.