What does 4WD service means

GMC SIERRA
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DWOOD61
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My diag. code is 4wd service. what does that mean is wrong. or what can i check. just looking for some ideas on what might be wrong.

1999 GMC Sierra 123,800 miles small V8
Jan 29, 2007 at 4:26 PM
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FASCARS
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It's probably the 4WD console switch on the dash that needs replacing, I had the same problem with a 2000 Z71, replaced the switch console and haven't had a problem, yet. There is no code for service 4WD on my 2000 GMC. Maybe there is one for the newer models.
Feb 15, 2007 at 9:17 AM
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OUTLAW46
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check the level of gear lube in the transfer case. sensor may be telling you its low :)
Jul 14, 2007 at 10:22 AM
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