Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2001-2013 GMC Yukon, Yukon XL LD, Yukon Denali and Yukon Denali XL (and the listed Cadillac and Chevrolet models) with RPO Z55 or Z95 (note: the range runs to 2013).

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  2001-2013 GMC Yukon, Yukon XL LD, Yukon Denali, Yukon Denali XL With RPO Z55 or Z95

• On 2009 or prior vehicles, a Service Suspension System message appears on the DIC with incorrect rear ride height, and the Electronic Suspension Control (ESC) module has DTC C0696 or C0711 set.

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  Some customers of 2009 or prior vehicles, may comment of a Service Suspension System message on the DIC and the rear suspension ride height is incorrect. When checking for DTCs the Electronic Suspension Control (ESC) module will have DTC C0696 or C0711 set.

• A Service Suspension System message with rear ride height that may be low under a heavy payload and DTC C0711 set may be caused by an internal fault in the ALC pressure sensor, which may occur due to moisture getting into the sensor.

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  may also comment that the rear suspension ride height may be low under a heavy payload. When checking for DTCs the Electronic Suspension Control (ESC) module will have DTC C0711 set. This concern may be caused by an internal fault in the automatic level control (ALC) pressure sensor. This may occur due to moisture getting into the sensor.

• A hose may hang loose at the left rear of the vehicle; it may be damaged or disconnected from the air inlet filter of the auto leveling suspension air compressor.

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  Some customers may comment of a loose hose hanging down in the left rear of the vehicle. Upon inspection it may be determined that the hose is damaged or has become disconnected from the air inlet filter of the auto leveling suspension air compressor.

Possible causes

• This can be caused by the wiring to the automatic level control (ALC) pressure sensor being shorted to ground.

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  This concern could be caused by the wiring to the automatic level control (ALC) pressure sensor being shorted to ground

Steps to confirm (in the document’s order)

• The air compressor assembly may need to be removed from the vehicle to see whether the wiring is pinched between the compressor assembly and the frame.

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  The air compressor assembly may need to be removed from the vehicle to determine if the wiring is possibly pinched between the compressor assembly and frame.

Repair

1. Repair any damaged or shorted circuits, then reposition the wiring so it is not damaged again when the compressor assembly is installed.

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   Repair any damaged or shorted circuits and then reposition the wiring so it does not get damaged again during the compressor assembly installation.

2. The sensor is no longer serviced separately; for sensor replacement install a complete air filter, dryer and sensor assembly.

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   The sensor is no longer serviced separately. For sensor replacement, install a complete air filter, dryer, and sensor assembly.

3. For the loose hose, replace the auto leveling compressor air inlet filter and hose assembly (PN 22197160).

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   Replace the auto leveling compressor air inlet filter and hose assembly (PN 22197160)

Parts

• Vehicles built before May, 2012 need a jumper harness for the updated sensor design, which is included with the complete air filter, dryer and sensor assembly PN 22964558; vehicles built in May, 2012 and later use PN 22941807.

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  Vehicles built before May, 2012, will require a jumper harness for the updated sensor design. The jumper harness is included with complete air filter, dryer, and sensor assembly, PN 22964558. Vehicles built in May, 2012 and later do not require the jumper harness, and use PN 22941807.

Caution

• Do not replace the complete air compressor assembly for this wiring concern.

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  DO NOT replace the complete air compressor assembly for this concern.

• The automatic level system normally does not, or only very infrequently, cycle the compressor at key up. The Electronic Suspension Control module checks the system pressure at start up; if it is below 10 psi (69 kpa), the system operates the compressor to add air to the shocks as a replenishment cycle.

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  The automatic level system normally will not or very infrequently cycle the compressor at key up. The Electronic Suspension Control module checks the automatic level system pressure at start up. If the pressure is below 10 psi (69 kpa) then the system will operate the compressor to add air to the shocks as a replenishment cycle.