Mechanics

POWER STEERING AND BRAKES

2003 GMC Sierra • V8 4WD Automatic •

The power steering and brakes stopped working on my 03 GMC sierra 2500. This happened last year and the mechanics said it was the water pump, which they changed. We just changed the water pump and belt and still not working. HELP PLEASE! Can't afford a mechanic billnow!
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Adglidden
December 26, 2010.




This truck uses a hydro boost that runs off the power steering, remove the serp belt and try pulling the power steering pulley out of the pump. If it comes out, the shaft broke, and requires pump replacement. Your waterpump would only affect the steering if it siezes up and breaks the serp belt! GM proceedure: Diagnostic Tips/Recommendations When Power Steering Pump Replacement is
Necessary
TECHNICAL SERVICE BULLETIN
Reference Number(s): 06-02-32-013B, Date of Issue: August 07, 2009
Affected
Model(s): 1997-2010 GM Passenger Cars and Light Duty Trucks (including Saturn); 2010
and Prior HUMMER H2, H3; 2005-2009 Saab 9-7X
Supercedes: This bulletin is being revised to add model years and update the information.
Please discard Corporate Bulletin Number 06-02-32-013A (Section 02 - Steering).
Superceded Bulletin(s): 06-02-32-013A, Date of Issue: February 5 2008
Related Ref Number(s): 06-02-32-013, 06-02-32-013A, 06-02-32-013B
ARTICLE BEGINNING
SERVICE INFORMATION
A recently completed analysis of returned power steering (PS) pumps that had been replaced for
noise, no power assist, no or low pressure and leaking conditions has indicated a high number of
"No Trouble Found" results.
Corporate Bulletin Number 01-02-32-004 indicates that when attempting to repair a power steering
concern, the steering system analyzer should be utilized to assist the technician in a successful
diagnosis. Note- Saturn ASTRA does not utilize the Power Steering System Analyzer.
In addition, extensive warranty analysis has shown that the following situations are all significant
root causes of PS pump failures: Improper pulley installation

Re-using the O-rings

Using fluid other than the OE-specified steering fluid

Failure to flush the PS system

In order to help improve customer satisfaction and reduce comebacks, GM recommends the
following tips for replacing a PS pump: Low or no pressure from the PS pump may be the results of dirty or contaminated fluid,
which could cause the pressure relief valve to stop functioning. Using the proper tools, flush
and bleed the PS system. Any residual contaminants will result in pump failure.
1.
When removing the pulley, use the proper special tools. Because the pulley alignment is
critical, distorting the pulley may damage bearings on the new PS pump.
2.
NOTE: Some new PS pumps may not include a new O-ring. Please
refer to the appropriate Parts Catalog. Saturn retailers should
refer to the appropriate model year Parts & Illustration Catalog
for the vehicle.
Be sure to use only the new O-rings included with the PS pump. The new reservoir O-ring
must be lubricated with OE-specific PS fluid prior to installation. Also make sure that the
3.
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Diagnostic Tips/Recommendations When Power Steering Pump Replacement is Necessar.
Control valve O-ring is in its exact groove position and is NOT covering the pressure bypass
hole.
Bleed the PS system according to the procedures/recommendations in SI.
4.
Following these procedures and using the correct tools and fluids should help ensure that the new
PS pump operates properly. Skipping steps may cost you time and trouble later.

Page 2 of 2
Diagnostic Tips/Recommendations When Power Steering Pump Replacement is Necessar.

Merlin2021
Dec 26, 2010.


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