← Look into the faults of the GMC Yukon XL
Warning display
Service 4WD: possible causes and documented repairs — 2000–2006 GMC Yukon XL
Of the records of the 2000–2006 GMC Yukon XL, 5 state “Service 4WD” (Owner complaint: 4, Manufacturer communication: 1). The technical documents say how to deal with 3 of its possible causes. They are listed by the number of matching records, most first.
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Causes the technical documents say how to deal with (3)
Service 4WD indicator and DTC B2725 (transfer case shift control switch)
1 matching record
The “Service 4WD” indicator is illuminated and DTC B2725 is set.
How to tell
- B2725
- Service 4WD
What to do
- With the "Service 4WD" indicator illuminated and DTC B2725 set, the correction is to replace the transfer case shift control switch.
4WD/AWD lamps and system inoperative: "sleepy" New Venture Gear transfer case control module (reprogram the TCCM)
No matching record (stated by the technical documents)
How to tell
- C0550
- Service 4WD
What to do
- As a temporary fix, remove and reinstall the TCCM fuse.
- Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.
- Replace the module only if a C0550 DTC shows as current or in history; the reference is bulletin 02-04-21-006D.
Transfer case service light, New Venture Gear transfer case (replace the encoder motor sensor and reprogram the TCCM)
No matching record (stated by the technical documents)
How to tell
What to do
- Verify that the encoder motor is the primary cause.
- Replace the encoder motor sensor and reprogram the TCCM; the labor operation is K9980.
Causes only records name
Not in the technical documents: named as the cause in records. A cause written in a complaint is the owner’s judgment or what a dealer said, not a confirmed fact.
Related symptoms, trouble codes and warning displays
What the technical documents state together with the faults above.
- Symptom
- Warning light
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.