There is a common problem with 1999-2001 Chevrolet Silverado where the service 4wd light comes on in the vehicle. The light is scary and led me to believe there were major issues with my four wheel drive, but it turns out its a quick, cheap, and painless fix by swapping out the 4wd selector switch. If you take it to a dealer they will charge you from as low as $180 to as high as $400. I’ll show you how to fix it for $50 in 5 minutes.
Update: Before step 1… make sure your transfer case fuse is good. On my truck it’s labeled ATC (Auto Transfer Case) and is located in the main fuse box under the hood.
Step 1: Remove the Dash Plate (to get the part number of your switch)
Pop off the dash. It’s simple and doesn’t requires tools. Tilt your steering wheel down and put the gear shift in 1st. Now using your fingers, pull the dash plate off. There are about a dozen points where it connects. Pop them off and pull the dash plate off.
Step 3: Get the part number of the switch
Turn the switch over and look for the part number on the back. Mine is a 2000 Silverado Z-71 Extended Cab. The part number is the longer of the two – 15709327. I believe they used this part for 1999, 2000, and 2001.
Step 4: Order the part
You can get the part either from GMPartsDirect.com or a dealer (who will probably charge you more). It was about $40 plus shipping from gmpartsdirect. There is a search box on the front page, punch in the part number you wrote down from the back of the switch.