One problem related to engine belts and pulleys has been reported for the 2007 Buick Lucerne. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Buick Lucerne based on all problems reported for the 2007 Lucerne.
Bought car 6/2/08 with 6000 miles on odometer. Immediately noticed extreme vibration throughout vehicle while driving also in park at 1500 rpms. Dealer in consort with gm attempted to fix; could not do it. Dealer alleges "vehicle working as designed". Apparently designed to vibrate. My concern is that the problem is in the engine - not in suspension or tires, etc. With vibration comes inordinate wear and possible failure while driving possibly causing an accident with injuries. Additionally, the front safety belts are defective in that they do not lock up and restrain the upper torso as designed. Dealer has replaced both belts; however, they still do not work as designed and required posing a clear and present danger to the driver and passenger in the front seats. There has not been an incident as yet; however, the possibility of one is rather obvious and gm thus far has been unable to resolve the issue safely and satisfactorily.