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traded in my 05 3.6 cts this past august for a loaded 2011 3.6 cts. I recently noticed a humming sound at stops. Never heard this with my 05. I did have to replace the rear diff (common problem) for that year 05 . rear diff noise was different. anyone else have this humm?
 

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2008 CTS 3.6L DI RWD, GMPP new engine 11/2013
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Dunno...could your "humming noise" be a DI-engine exhaust system resonance? Quite common to early 2nd Gen CTS, mine grew progressively louder and more annoying until my dealer recently removed the entire dual exhaust, from engine block to chrome tips, and replaced it all with the latest redesigned system (service tech also cut off new integral stainless steel tips and welded on brand-new old-style chrome tips - nice). Much improved...but still some low-level resonance, vibration, hum when stopped at idle. I can live with it now.
 
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