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thanks for the reply,

do you know if that would cause all of the lights on the switch not to work? or is the system just shut down with the service light on?

thanks mike

I have a 2001 Silverado, I drove home in 4wd last night and left the truck in 4x4 all night (the temp is -5) well I get out there today (still -5) and my service 4wd light is on, and my truck is back...

any idea what the cost was?

thanks