GM Service Manual Online
For 1990-2009 cars only

Condition

Causes

Low pressure due to the steering pump is present.

    â€¢ A seized flow control valve
    â€¢ An inoperative flow control valve
    â€¢ A worn pressure plate or thrust plate
    â€¢ An improperly installed pressure plate or thrust plate
    â€¢ A cracked thrust plate or pressure plate
    â€¢ A broken thrust plate or pressure plate
    â€¢ A worn cam ring
    â€¢ A worn rotor
    â€¢ Worn vanes
    â€¢ Vanes sticking in the rotor slots
    â€¢ High internal pump leakage