Service 4WD light (code c0550)

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UMPIRE
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My 1999 Chevy Blazer with 121,000 miles and 4.3L has the Service 4WD light on. The blazer will not shift into any mode of 4 wheel drive. No lights appear on the switch. However the lights all come on ocassionaly or the correct light will come on. A friend (mechanic) with a scanner got a code of C0550. What is this?
Oct 2, 2007 at 8:05 PM
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DENNYP
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[quote:0882732f24="umpire"]My 1999 Chevy Blazer with 121,000 miles and 4.3L has the Service 4WD light on. The blazer will not shift into any mode of 4 wheel drive. No lights appear on the switch. However the lights all come on ocassionaly or the correct light will come on. A friend (mechanic) with a scanner got a code of C0550. What is this?[/quote:0882732f24]that code means if you have good power and ground to the transfer case module,the module is no good.
Oct 3, 2007 at 9:55 PM