GMC Yukon 2000–2006

▸Known issues4WD/AWD lamps and system inoperative: "sleepy" New Venture Gear transfer case control module (reprogram the TCCM)1

1. Manufacturer communication2002–2004 GMC FULLSIZE AND MIDSIZE PICKUPS AND UTILITIES (YUKON) ・ 2005-02-01(also printed in 1 other issues)

   "Sleepy" New Venture Gear transfer case control module: reprogram the TCCM

   1. 1Fault

      • Warning light
      • C0550
      ↓→

   2. 2Finding the cause

      Not stated

      ↓→

   3. 3Correction

      Repair

      1. Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.
      2. Replace the module only if a C0550 DTC shows as current or in history; the reference is bulletin 02-04-21-006D.

      Caution

      • Do not replace the encoder motor or the transfer case.
   Read the sentences of the record

   From the manufacturer’s document

   • Applies to：Row for 2002-2004 Fullsize and Midsize Pickups and Utilities: sleepy New Venture Gear transfer case control module.
   • Repair：Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.
   • Caution：Do not replace the encoder motor or the transfer case.
   • Repair：Replace the module only if a C0550 DTC shows as current or in history; the reference is bulletin 02-04-21-006D.

   Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

   Remedy

   Truck Issues — Fix It Right the First Time 2002-2004 Fullsize and Midsize Pickups and Utilities – Sleepy New Venture Gear Transfer Case Control Module Verify sleepy module as primary cause. Reprogram TCCM with latest software. Don’t replace encoder motor or transfer case. Replace the module only if a C0550 DTC shows as current or in history. 02-04-21-006D