GMC Repair: 2000 3/4 ton seirra, vacuum line, axle shaft

Question
Hello,
 Just hit 80,000 miles and the 4 wheel drive warning light has come on..just would like to know if there are some common problems that can be easily fixed or is it off to the dealership?The manual says to contact dealer.....

thanks Chris

Answer
What mechanical work or ANY kind of work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made as a vacuum line may have been knocked loose or a wire connection came loose, Look around in the area where work was performed.

If anyone has done ANY type of work especially around the wheels there is a strong possibility that the wheel sensor may have been knocked loose from the holding bracket, Look at each wheel where the axle shaft goes into the backside of the brake backing plate for the sensor.


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