Defect
Certain vehicles were produced with lower control arm ball stud nut/washer assemblies with washers made of the wrong steel material. The washers may fracture and become loose or fall away from the vehicle, reducing clamp load. Separation of the control arm ball stud and steering knuckle, due to disengagement of the tapered attachment and retaining nut, is possible and may occur without prior indication to the vehicle operator. If the control arm separates from the knuckle, the affected corner of the vehicle will drop and the control arm would be forced downward, contacting the wheel. The affected wheel could tilt outward and create a dragging action that would tend to slow the vehicle and create a tendency for the vehicle to turn in the direction of the affected wheel. In extreme situations, the affected wheel assembly could separate from the vehicle. Separation of the wheel assembly would also sever that wheel's hydraulic brake hose and result in diminished braking performance of the vehicle, which could result in a crash.
Safety Risk
No risk description available.
Remedy
Dealers will install a new nut and washer, and if required, replace the ball stud and/or steering knuckle.