Mechanics

SERVICE 4WD LIGHT (CODE C0550)

Chevrolet Blazer

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?
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Umpire
October 2, 2007.



That code means if you have good power and ground to the transfer case module, the module is no good.

Dennyp
Oct 3, 2007.