My local dealership gave me a 2013 RWD CTS loaner (only 43 miles on it) and there was definite shifter vibration.
My 2011 AWD coupe's shifter only moves back and forth when I accelerate or brake aggressively, but its so slight you only notice if your hand is resting on it.
My 2011 AWD coupe's shifter only moves back and forth when I accelerate or brake aggressively, but its so slight you only notice if your hand is resting on it.