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Reviving this old post - was anything ever determined to be the cause? I have a 2010 with DCT and my transmission is also exhibiting this behavior with some error codes. I usually do my own work but I took this to an Indy as I could not determine root cause. They are telling me it needs a new gear selector switch (basically the part under the shift knob). I have also seen some battery issues and read on the M3 boards that the GSS fault could cause a battery draw on the E90 M3 (which looks like it has the identical DCT).
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