Does the C220 has electrica tranny or Hydraulic?? My Grand Cherokee would do the same, too. But usually only the the last minute of stopping(I believe it's when the tranny downshifts from 2nd into 1st). And dealer told me it's normal since my Jeep is a 1993, and tranny is getting out(or is the dealer giving BS again...?).

Happy Motoring...
Andy Kuo
'92 400SE