One problem related to loud engine noise has been reported for the 2011 Jeep Compass. The most recently reported issues are listed below.
With my foot on the brake, completely stopped at a light or stop sign, while in drive only, the car vibrates and the engine makes a loud rumbling noise. This can be felt in the steering wheel, brake pedal and throughout the entire car. When I take my foot off the brake or put it in neutral, reverse or park the noise from the engine and vibration will stop. The vibration is so bad it is uncomfortable to keep your foot on the brake, or hands on the steering wheel, making it dangerous, as I am having to put the car in neutral at every stop. Have had it at an authorized Jeep dealer 2 times now and they have found nothing wrong. Contacted Jeep, as the car only had 3600 miles on it when I first took it in, they assigned me a case number, and will be in the shop until it is fixed. Thank you Jeep for trying to find a cure for this problem, as I love my Compass, and really want it fixed.