HiCustomerthis is lostrider, it could be the pump or the steering rack, the pump produces the pressure need for the steering rack to actuate, if the rack has gone bad or the pump is not producing the pressure needed, either could be the problem, I would recommend getting the system diagnosed before you put parts on the car due to the cost of the parts, but here is the price for replacing the pump assembly, hope this helps.
The labor to replace the pump is 2 hours at the current labor rate for your area.
Here is the price for the steering Rack/Gear assembly:
The Labor to replace the Rack is 4 hours at the current labor rate for your area plus the vehicle will need to be aligned after the rack replacment.
These prices are base on the engine in your car is a 3.0 ltr V6.