GMC Yukon 2000–2006

▸EQUIPMENT1

1. Manufacturer communication2006 GMC YUKON DENALI ・ 2023-12-04(6 earlier editions of this document folded here)

   Aftermarket ALDL/DLC Interface Devices Causing Multiple Issues

   1. 1Fault

      • Gauge or instrument fault
      • Warning light
      • C0561 (general documents only)
      • U0100 (general documents only)
      • U0101 (general documents only)
      • U186B (general documents only)
      • U1862 (general documents only)
      • U2109 (general documents only)
      • 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 SES, MIL or CEL light may be set with numerous communication DTCs such as U0100, U0101, U186B and U1862.
      • The transmission may not shift for one key cycle (TCM in default mode).
      • Gauge readings may be erratic or displays may flicker.

      1 more points
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   2. 2Finding the cause

      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.
      • 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.

      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.
      ↓→

   3. 3Correction

      Repair

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

      Caution

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

   From the manufacturer’s document

   • Applies to：Applies to 2006-2014 GM passenger cars and trucks.
   • Condition：Bus or LAN traffic may stay active, leading to a discharged vehicle battery.
   • Condition：C0561 may be stored in the EBCM, leading to a traction control issue.
   • Condition：The SES, MIL or CEL light may be set with numerous communication DTCs such as U0100, U0101, U186B and U1862.
   • Condition：The transmission may not shift for one key cycle (TCM in default mode).
   • Condition：Gauge readings may be erratic or displays may flicker.
   • Condition：Electric power steering boost may be erratic, potentially with codes U2109, U2107, U2100, B1325 and C0000.
   • Confirm：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.
   • Cause：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.
   • Cause：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.
   • Caution：The customer may have removed the device for use in another vehicle while the vehicle is in for service.
   • Repair：If the device is available, try to duplicate the condition, then remove the device to see whether the condition is eliminated.

   Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

   Remedy

   Aftermarket ALDL or DLC Interface Devices Causing Multiple Issues