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Trouble code
C0550: possible causes and documented repairs — 2000–2006 GMC Yukon XL
Of the records of the 2000–2006 GMC Yukon XL, 1 state trouble code C0550 (Manufacturer communication: 1). The technical documents say how to deal with 1 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 (1)
4WD/AWD lamps and system inoperative: "sleepy" New Venture Gear transfer case control module (reprogram the TCCM)
1 matching record
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.
Related symptoms, trouble codes and warning displays
What the technical documents state together with the faults above.
- Warning display
- Service 4WD
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.