I have an 05' Silverado Crew Cab with 67000 miles on it, and recently the "Service 4WD" comes up on my display. The problem is that when it it comes up, I do not have any lights on the 2WD/4WD selector area and I can't change it unless I turn the truck off a time or two and the lights come back on. Does anyone have any idea what could be the problem before I spend a bunch of money at the dealership?

 

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Check the encoder motor.

 

I had the same problem with my 99 Silverado at around that same mileage. Turned out it was the switch (easy to install). But you know, it's a hit and miss proposition.You can get a switch on-line gmpartsdirect.com for about $50.

 

You don't happen to remember the part number do you?

 

You don't happen to remember the part number do you? Or possibly where on GMpartsdirect I could go to find the part?

 

The parrt number for the switch is 15709327.

 

My 1999 was the switch also!!

 

Come to find out, it is the encoder. I had a mechanic at my work run the codes...Does anyone know how to fix it?