GM Service Manual Online
For 1990-2009 cars only

Condition

Causes

Low Oil Pressure Due to Steering Pump

    • The flow control valve is stuck.
    • The flow control valve is inoperative.
    • The pressure plate is not flat against the cam ring.
    • The cam ring is worn.
    • The pressure plate is scored.
    • The thrust plate is scored.
    • The rotor is scored.
    • The vanes are sticking in the rotor slots.
    • The thrust plate is cracked.
    • The thrust plate is broken.
    • The pressure plate is cracked.
    • The pressure plate is broken.
    • Internal leakage occurs.