Recalls

USA Recall: Once clamp load is lost, all tire loads are taken by the wheel studs resulting in a fracture of the wheel studs. this could cause the wheel to separate from the vehicle and could result in a vehicles crash without prior warning.
Paint on the wheel mounting surfaces can act as a shim between the wheel and the rotor/drum. as the vehicle is driven, the wheel imbeds into the paint, loosening the lug nut and causing a loss of clamp load.

Corrective Action:
Dealers will clean the wheel mounting surfaces for all four wheels. also, the wheel studs will be inspected for damage and will be replaced as necessary.

Additional Notes:
System: wheels; lug nuts; bolts.vehicle description: passenger cars. note: if your vehicle is presented to an authorized dealer on an agreed upon service date and the remedy is not provided within a reasonable time and free of charge or the remedy does not correct the defect or noncompliance, please contact chevrolet at 1-800-222-1020, buick at 1-800-521-7300, or cadillac at 1-800-458-8006. also, please contact the national highway traffic safety administration's auto safety hotline at 1-800-424-9393.