Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2006-2016 GM passenger cars and trucks.

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  2006-2016 GM Passenger Cars and Trucks

• The bulletin is written with a focus on full size trucks, full size vans and other fleet vehicles, but could apply to any vehicle.

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  This bulletin is being written with a focus on full size truck and full size van along with other fleet vehicles, but could apply to any vehicle.

• Bus or LAN traffic may stay active, leading to a discharged battery.

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  Bus or LAN traffic may stay active leading to a discharged vehicle battery.

• C0561 may be stored in the EBCM, leading to a traction control issue.

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  C0561 stored in the EBCM leading to a traction control issue.

• The SES, MIL or CEL lamp may be set with numerous communication DTCs such as U0100, U0101, U186B and U1862.

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  SES, MIL or CEL light set and numerous DTC communication codes such as U0100, U0101, U186B and U1862.

• The transmission may not shift for one key cycle (TCM in default mode).

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  Transmission may not shift for one key cycle (TCM in default mode).

• Gauge readings may be erratic or displays may flicker.

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  Erratic gauge readings or flickering displays.

Possible causes

• Monitoring devices and other electronic accessories such as aftermarket cruise control or police speed checking devices (RADAR or LIDAR) may cause one or more of the listed concerns.

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  Monitoring devices, along with other electronic accessories such as aftermarket cruise control, or police speed checking devices (RADAR or LIDAR) may cause one or more of the concerns listed above.

• Many of the problems could be caused by an open connection on the HSCAN bus.

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  Many of the problems described could be caused by an open connection on the HSCAN bus.

Steps to confirm (in the document’s order)

1. If normal diagnosis finds no root cause, check for a tracking or maintenance-scheduling device plugged into the ALDL / Data Link Connector (DLC).

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   check for a device plugged into the Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC) for tracking and/or maintenance interval scheduling.

2. A device with a secondary DLC connector and its harness can be hidden out of sight, so the technician may not notice that the diagnostic connector is not in its factory location.

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   The rest of the harness along with the device can be placed out of sight hidden from the technician, who may not notice the diagnostic connector is not in the factory location.

Repair

• If the device is available, try to duplicate the condition, then remove the device to see whether the condition is eliminated.

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  attempt to duplicate the condition, and then remove the device to determine if the condition is eliminated.