Hello Customer (name blocked for privacy),
The condition is caused by the oversized tires. The factory has a PI or preliminary infomation on this concern.
I'll attach it to the bottom of this answer.
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Russ
#PIT3386D: Lack of Steering Assist or Shudder During Parking Lot Type Manuevers - keywords bind booster hard hydraulic noise - (Jul 31, 2006)
Images available only to Customers.
| Subject: | Lack of Steering Assist or Shudder During Parking Lot Type Maneuvers |
| Models: | 2002-2006 Cadillac Escalade Models |
| 2000-2006 Chevrolet Avalanche, Tahoe, Suburban |
| 1999-2007 Chevrolet Silverado Classic |
| 1999-2007 GMC Sierra Classic |
| 2000-2006 GMC Yukon Models |
This PI is being updated to add fix information and models. Please discard PIT3386C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment on a lack of steering assist when stopped or during parking lot type maneuvers.
Recommendation/Instructions:
Please follow normal diagnostics in SI for this condition. If the vehicle passes the Power Steering Pressure Test Procedure in SI this may be a normal condition. 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 concern can be aggravated by worn tires, low tire air pressure, low power steering pump pressures, and tires larger than stock size. In some cases, where the power steering pump pressures are at the low end of the specification, replacing the power steering flow control valve with P/N 26095470 may improve the concern. On 1500 models with the 670 gear please following Bulletin 05-02-32-008A, which may increase customer satisfaction.
No further repairs should be attempted as this is a characteristic of the vehicle. Any customer concerns should be referred to the Area Vehicle Manager (AVM) and a Field Product Report should be submitted by following bulletin 02-00-89-002D. When submitting the Field Product Report please advise if the vehicle is equipped with anything other than the stock wheel and tire size, example GM SPO 20 inch Wheels and Tires.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. | Images available only to Customers.
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