One problem related to loud engine noise has been reported for the 2005 Volkswagen Passat. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Volkswagen Passat based on all problems reported for the 2005 Passat.
Loud noise in the lower half of engine prompted evaluation by mechanic. Problem was from failure of chain driven balance module. This failure was due to faulty design that vw has admitted to by virtue of no longer manufacturing this unit and replacing it with a totally re-engineered balance shaft module that is gear driven. Complete failure of this unit while operating the vehicle could result in a collision that potentially could be fatal. Vw refuses to be responsible and admit their error in design to the public, hoping to avoid a costly recall campaign. In the meantime vw owners are having to pay $2500 to $3000 for this repair. At the same time this is a recognized problem with the same engines in europe and vw has re-engineered the parts for north America for replacement. Vw needs to be held responsible for this design failure and the affected engines in north America need to be repaired at vw's expense before someone gets killed.