Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2018 and prior GM passenger cars and light duty trucks equipped with hydraulic power steering.

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  2018 and Prior GM Passenger Cars and Light Duty Trucks Equipped with Hydraulic Power Steering

• When diagnosing a power steering fluid leak, the technician may find a heat damaged fluid reservoir.

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  When diagnosing power steering fluid leak conditions, the technician may find a heat damaged fluid reservoir.

Possible causes

• Super heated power steering fluid may affect the pump, reservoir and hoses, and these parts may show no apparent issue at the initial diagnosis.

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  Conditions that are the result of super heated power steering fluid may involve the power steering pump, reservoir, and hoses. These additional components may not have any apparent issues at the time of the initial diagnosis.

• Fluid temperatures high enough to distort or damage the reservoir may damage the power steering pump and affect its durability.

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  Fluid temperatures sufficient to distort or damage the reservoir may cause damage to the power steering pump affecting durability.

Repair

• When replacing a reservoir for a leak that appears to be caused by super heated fluid, also replace the power steering pump and hoses.

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  When replacing a power steering reservoir for a leak condition, if the condition appears to be caused by super heated fluid, it's important that the power steering pump, reservoir, and hoses also be replaced to prevent a subsequent concern, resulting in customer dissatisfaction.

Caution

• Advise the customer not to hold the steering against the stop or end of travel for more than 5 seconds at an engine speed above 1,500 rpm.

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  Holding the steering against the "stop" or end of travel for more than 5 seconds at an engine speed in excess of 1,500 rpm.

• Continuous spin-outs or "doughnuts" with the steering at or near the end of travel for more than 5 seconds at a time above 1,500 rpm also overheat the fluid.

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  Doing continuous spin-outs, "cookies" or "doughnuts" with the steering against the end of travel or close to the end of travel for more than 5 seconds at a time at an engine speed in excess of 1,500 rpm.