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We have a back dash rattle on our Regal.
Our local dealer said they fixed it but didnt
Called a guy I know at another dealer and here is what he found (not our issue, ours is the back dash rattling, just thought others might find it helpful)
Subject: Locating/Repairing Noise or Rattle from Rear of Vehicle When Driving Over Rough Surfaces
Condition/Concern
Some customers may comment on hearing a noise/rattle from the rear of the vehicle when driving over rough surfaces. The noise may sometimes be reported to be coming from the rear package shelf.

The cause of this condition may be that the upper corner (1) of the left or right tail lamp is contacting the body sheet metal when the vehicle is driven on rough roads. Lightly pressing on this area of the lamp will often verify the condition.
Earlier builds may have no bumper/ insulator in this area and later builds may have a hard rubber bumper on the underside of the lamp housing, which may have shifted or come loose.
If so, farther along they list a "special" piece of foam to order from the warranty parts center. PM me your VIN so I can order them for you if you think this is your problem, otherwise we can look at it here to find the cause.
Our local dealer said they fixed it but didnt
Called a guy I know at another dealer and here is what he found (not our issue, ours is the back dash rattling, just thought others might find it helpful)
Subject: Locating/Repairing Noise or Rattle from Rear of Vehicle When Driving Over Rough Surfaces
Models: 2011 Buick Regal
Built Prior to VIN Breakpoint B1013646
Built Prior to VIN Breakpoint B1013646
Condition/Concern
Some customers may comment on hearing a noise/rattle from the rear of the vehicle when driving over rough surfaces. The noise may sometimes be reported to be coming from the rear package shelf.


The cause of this condition may be that the upper corner (1) of the left or right tail lamp is contacting the body sheet metal when the vehicle is driven on rough roads. Lightly pressing on this area of the lamp will often verify the condition.
Earlier builds may have no bumper/ insulator in this area and later builds may have a hard rubber bumper on the underside of the lamp housing, which may have shifted or come loose.
If so, farther along they list a "special" piece of foam to order from the warranty parts center. PM me your VIN so I can order them for you if you think this is your problem, otherwise we can look at it here to find the cause.