GM Service Manual Online
For 1990-2009 cars only

Condition

Cause

Low Oil Pressure Due to Steering Pump

    • A stuck flow control valve
    • An inoperative flow control valve
    • The pressure plate not flat against the cam ring
    • Extreme wear of the cam ring
    • A scored pressure plate
    • A scored thrust plate
    • A scored rotor
    • The vanes sticking in the rotor slots
    • A cracked thrust plate
    • A cracked pressure plate
    • A broken thrust plate
    • A broken pressure plate
    • High internal leakage