It's conductor plate time.

There are speed sensors in the plate that often fail. These sensors check the shaft speed along the gear train in the transmission. When a sensor fails, the computer shuts down the party, because it assumes the transmission is tearing itself apart. If the speeds don't agree through the transmission based on the gear it thinks you are in then it throws the codes.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech