Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2006-2013 GM passenger cars and trucks.

  the passage

  2006-2013 GM Passenger Cars and Trucks

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

  the passage

  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.

  the passage

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

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

  the passage

  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).

  the passage

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

• Gauge readings may be erratic or displays may flicker.

  the passage

  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.

  the passage

  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: a device that connects to only one CAN + causes bus errors and erratic ECU behavior.

  the passage

  Many of the problems described could be caused by an open connection on the HSCAN bus. Example: if the device only makes connection with one CAN +, then it will cause bus errors and erratic ECU behavior.

Steps to confirm (in the document’s order)

• If nothing else can be identified as the root cause, check for a device plugged into the Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC) for tracking or maintenance interval scheduling.

  the passage

  If nothing else can be identified as the root cause of the issue, check for a device plugged into the Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC) for tracking and/or maintenance interval scheduling.

Repair

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

  the passage

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

Caution

• The customer may have removed the device for use in another vehicle while the vehicle is in for service.

  the passage

  These devices may be removed by the customer for use in another vehicle while theirs is brought in for service.