I'd take a look at the TC Actuator motor and see if the plastic gear is stripped. If it's bad, check out this web site for a replacement gear, (much cheaper than replacing the entire unit):

Odometer Gears

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp