The shock absorbers are inoperative.

Replace the shock absorbers. Refer to Shock Absorber Replacement in Rear Suspension or Shock Absorber Replacement in Front Suspension.

The spring has a broken leaf.

Replace the leaf or spring assembly. Refer to Spring Leaf Replacement in Rear Suspension or Leaf Springs Replacement in Front Suspension.

The vehicle was used under severe operation or the vehicle has been overloaded.

Check the load capacity rating. Refer to Vehicle Certification Label in General Information.