Service 4WD Message May be Displayed on GMC Sierra 2500

The 4WD transfer case position sensor or the selector switch may fail causing the service 4WD message to be displayed.

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Average mileage: 153,200 (61,000–230,000)
Drive Trains affected: 4WD, Automatic Transmission
6 model years affected: 1999, 2000, 2001, 2002, more2003, 2004
12 people reported this problem
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Viewing 1 - 3 of 3 problem details
service 4 wheel drive message and lights switch to 4 low or just blink. must turn off p/u to stop and show 2 wheel.
2004 GMC Sierra 2500 - Automatic Transmission 132,000 mi,
Service 4wd light comes on.
2004 GMC Sierra 2500 - 4WD 220,000 mi,
service 4wd light on