The fluid could be low, the bearings could be bad or the pump itself could be starting to fail. If the fluid is full then the pump may have to be changed.
if it makes a loud whinning noise when you turn power steering pump bad or needs fluid if not it might be a popped belt
You might be low on power steering fluid
Power Steering?
Many things can cause that, the simplest cause being lack of power steering fluid.
Power Steering Fluid Or Power Steering Pump
ummm power steering
If the sound is a loud growling , whining, noise you're probably low on power steering fluid. Now the cause of the fluids loss is WHERE ?
check your power steering pump might be going out or might be low of power steering fluid
Check your power steering fluid
Check and see if your power steering fluid level is low.
Air in the pump can cause noise and friction during turning. An option is to ask your mechanic to bleed the power steering in order to remove the air. This will definitely solve the problem as long as the power steering pump is functioning optimally
you have a bad power steering pump get a new one