One problem related to loud engine noise has been reported for the 2012 Volkswagen CC. The most recently reported issues are listed below.
While driving on the highway, epc and engine waringing signs were on all of sudden. I checked with local repair shop in solvang, CA. They said, they wanted to add 2 quarts of engine oil and check. After then, they said there were loud noise from the engine and then engine died. My car towed to nearby vw dealership. The dealership did diagnostics test and said it needed to be replace an engine.