GM Service Manual Online
For 1990-2009 cars only

Important: 

   • Perform the Diagnostic System Check before using the Symptom Tables in order to verify that all of the following are true:
   • There are no DTCs set.
   • The control module(s) can communicate via the serial data link.
   • Review the system operation in order to familiarize yourself with the system functions. Refer to Power Steering System Description and Operation .

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the power steering system. Refer to Checking Aftermarket Accessories .
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Inspect the power steering reservoir for the proper fluid level.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Hissing Noise In Steering Gear
    •  Rattle in Rack and Pinion Steering Gear
    •  Increase in Effort While Turning Steering Wheel
    •  Steering Wheel Surges/Jerks While Turning
    •  Steering Wheel Kickback
    •  Foaming, Milky-Appearing Power Steering Fluid
    •  Whine Noise in Steering Pump