One problem related to loud engine noise has been reported for the 2011 Cadillac CTS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Cadillac CTS based on all problems reported for the 2011 CTS.
The supercharger started to make a noise which sounded like marbles. It now is getting louder sounding like it is going to fall off. It is a Cts-v.