Air is present in the system.

1. Add power steering fluid to the power steering reservoir. Refer to Checking and Adding Power Steering Fluid .
2. Bleed the system. Refer to Power Steering System Bleeding .
3. Inspect the hose connectors for proper torque or damaged seals.

The steering gear mounting is loose.

Tighten the attaching bolts to the specified torque. Refer to Fastener Tightening Specifications .

There is a worn or damaged steering gear.

Replace the steering gear. Refer to Steering Gear Replacement .