Pulling out of my driveway with a 2018 Thor Chateau 24FS (with a 2016 Sprinter 3500 diesel chassis) with less than 9K miles, I had a "bang" from the transmission. One bang only. In hindsight, this was just after a right turn. About 300 miles later after a stop light and right turn, the Transmission started trying to shift back and forth between 2 and and 3 (or maybe 1st and 2nd) in somewhat violent rapid alternation. I stopped and restarted the RV. Ran fine. About 75 miles later after a right turn, same thing. Stopped and restarted.
ODBii (ScanGauge) gave me a C0037 "left rear wheel sensor" code and the dash lights showed: Check Engine, ABS, Tire Rotation and Traction lights...and they wouldn't go off after restarting engine.
I'll skip the sad parts, but finally got it to an MB dealer and they simply pulled the code and replaced the left rear wheel speed sensor. Have only put 10 miles on it since then w/o problems. I hope the problem is now fixed.
Also, as hindsight, when this starts to happen, perhaps putting the transmission into manual shift mode might help. Stop/Start/Put in drive then left tapping the shift knob will shift down to 3, then 2nd then first. Right tap to shift up. Manually forcing the transmission from 1st, 2nd, 3rd and 4th as you accelerate might work around the transmission having fits if you can stop and then downshift to first gear before a right-turn...might be a short-term workaround to all the banging. I've not tried this (and hope I don't).
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