05 Steering Problem

[05SBZ71]

So tonight after dinner I was heading home and every time I turned left the truck made a bad whistling noise and when making hard turns (U-turns) became hard to steer almost like I was losing the power steering. I just had the power steering pump replaced about a month ago for the commonly known whining hum that they're known to make. Its an 05 Silverado with only 19,000 miles. Its weird that it only does it when I turn left and not both directions.

 

Any help on the matter will be greatly appreciated. I'll most likely take it in on Monday if it continues to do the same thing. Hope everyone has a goodnight and a great weekend.

 

Thomas

[ChevyTech007]

Needs a steering gear. Below is a bulletin that might help.

 

Subject: EI06002 - 670 Gear Box Power Steering Pump, P/S Performance Concerns #05-02-32-008B - (07/18/2007)

 

 

 

Models: 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT

 

2003-2006 Chevrolet Avalanche, Suburban, Tahoe

 

2003-2007 Chevrolet Silverado Classic

 

2007-2008 Chevrolet Silverado, Suburban (2500 Series Only)

 

2003-2006 GMC Yukon, Yukon Denali, Yukon XL

 

2003-2007 GMC Sierra Classic

 

2007-2008 GMC Sierra, Yukon XL (2500 Series Only)

 

 

 

 

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This bulletin is being revised to add model years and models. Please discard Corporate Bulletin Number 05-02-32-008A (Section 02 -- Steering).

 

 

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Condition

Some customers may comment on a lack of steering assist when stopped or during parking lot type maneuvers. A lack of steering assist could occur if the brakes are applied and turning the steering wheel with the vehicle stopped or during parking lot type maneuvers. This condition will go away or greatly improve once vehicle begins to move or is above parking lot speeds. This concern can be aggravated by worn tires, low tire air pressure, low power steering pump pressures, and tires larger than stock size.

 

Correction

Important: In all cases, it is recommended that the proper tire size and the maximum tire pressure is set according to the manufacturer’s specification as noted on the door placard; especially for the front tires.

 

Perform the "Power Steering System Test" found in SI. Make any necessary repairs based on system diagnosis.

1.1. FOR 2500 AND 3500 VEHICLES ONLY - If diagnostics did not lead to any repair, this concern is a normal operating characteristic. No further repairs should be made. A Field Product Report should be submitted - refer to Corporate Bulletin Number 02-00-89-002D.

 

1.2. FOR 1500 SERIES VEHICLES ONLY - If diagnostics did not lead to any repair, this concern is a normal operating characteristic.

 

If the vehicle is equipped with a 670 gear box, replacing it with a 680 gear box may increase the customer satisfaction.

To determine if the vehicle is equipped with a 670 gear box, inspect the mounting bolts that attach the stub shaft housing. A 670 gear box will only have 3 mounting bolts. If the stub shaft housing does not have any mounting bolts or has 4 bolts - DO NOT PROCEED WITH THIS BULLETIN. The vehicle is not equipped with a 670 gear box.

If replacing a 670 gear box with a 680 gear box, it will be necessary to replace the power steering gear, union fitting and both inlet O-ring seals.

Parts Information

Part Number

Description

 

88965542

Power Steering Gear

 

26025709

Union Fitting

 

26001594

Inlet O-ring Seal

[05SBZ71]

Thank you, I appreciate the help. Hopefully I can get it taken care of first thing next week. If that is the case and it does need a new steering gear it will be the third one they've put in. They tried that twice before replacing the entire power steering pump when we were trying to eliminate the hum noise.

[deadringer]

I have an 05 Yukon Denali with OE GM 20's on it and have the exact problem that this TSB describes. Based on what I gather, my truck has the 670 gearbox and not the 680 that this TSB recommends.

 

I've made four trips to two dealers and they refuse to perform the TSB.

 

Evidentally my Denali was built with 17's originally, and the 20's were added later (this may or may not be true, I have no idea - I bought the truck new off the lot with the 20's)... therefore they claim that the "tires larger than stock size" and therefore this TSB doesn't apply.

 

These are the OE GM wheels that are an available option with the OE Goodyear rubber on them. Its actually as this photograph shows:

 

http://tinyurl.com/2s9j6y

 

Anyone have any advice on how to get this resolved?