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GMC Yukon 2000–2006

GMC YukonModel years 2000–2006

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Common on this vehicle:NoiseWarning light

Possible causes

「NP8」4 records
Transmission and driveline
14WD/AWD lamps and system inoperative: "sleepy" New Venture Gear transfer case control module (reprogram the TCCM)4WD / AWD only1Electronic transfer case stops shifting with no DTC (shift abuse lock out mode, normal)

The documents say what to doOnly records name itThe size of a node, the width of a link and the numbers are records matching this search, not likelihoods.

FaultCrate・GMC Yukon 2000–2006・「NP8」

Candidate cause (the documents say what to do)

4WD/AWD lamps and system inoperative: "sleepy" New Venture Gear transfer case control module (reprogram the TCCM)

Applies to: 4WD / AWD only

1 of the records matching this search name this component as the cause.

How to tell

C0550Service 4WD

What to do

  1. As a temporary fix, remove and reinstall the TCCM fuse.
  2. Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.
  3. 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.

What is needed

Parts and materials
  • Module (only if a C0550 DTC shows as current or in history)
Labor time
Not stated
Special tools
Not stated
Scan tool
  • Reprogramming of the TCCM with the latest software

Only what the technical documents state. "Not stated" does not mean not needed.

In the records

No record states work done for this cause.

See the evidence (2 technical documents, 1 records)

Passages of the technical documents

  • Bulletin 02-04-21-006, inoperative 4WD/AWD lamps and inoperative 4WD/AWD system, lists 2002-03 Chevrolet TrailBlazer, Silverado, Tahoe, Suburban, Envoy, Sierra, Yukon and Oldsmobile Bravada with the active two-speed transfer case (RPO NP8).

    02-04-21-006; Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System (Remove/Reinstall TCCM Fuse – Temporary Fix); 2002-03 Chevrolet TrailBlazer, Silverado, Tahoe, Suburban, BMC Envoy, Sierra, Yukon, Oldsmobile Bravada with Active Two-Speed Transfer Case (RPO NP8)

    General Motors 2002-09-01

  • Row for 2002-2004 Fullsize and Midsize Pickups and Utilities: sleepy New Venture Gear transfer case control module.

    2002-2004 Fullsize and Midsize Pickups and Utilities – Sleepy New Venture Gear Transfer Case Control Module

    General Motors 2005-02-01

  • As a temporary fix, remove and reinstall the TCCM fuse.

    Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System (Remove/Reinstall TCCM Fuse – Temporary Fix)

    General Motors 2002-09-01

  • Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.

    Verify sleepy module as primary cause. Reprogram TCCM with latest software.

    General Motors 2005-02-01

Read every statement and its source →

Manufacturer’s documents

Records

None among the records that can be opened now.

See all 1 records of this cause →

A cause or a result a complaint states is the owner’s view or what a dealer told them, not an established fact.

Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.