Same here with 335i 2012 Apr.
I think it is related to VSS.
It sounds like out of oil gear noise.
I went to dealer with this issue and they completely replaced steering wheel core(rod).
The replacement did somewhat improvement for a month but it came back.
Currently I send my car back to the dealer for this issue.
I will post it if I get new treatment on this.
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2015 F10-LCI 530D xDrive M Sports Package Black
2014 F32 435i M Sports Line Black
2012 F30 335i Sports Line Alpine White (retired)
2011 F25 X3 28i Silver
2010 E83-LCI X3 3.0 Silver (retired), 2007 E90 328i Gray
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