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?
Tuesday, October 2nd, 2007 AT 8:05 PM