First check the fuse located in fuse box under hood. The most common problem is in the push-button switch located in the dash. I am a 67 year old female and fixed my boyfriend's 4WD in under 1/2 hour last week-end. You can order a new switch on eBay for under $40.00. Adjust steering wheel to lowest position and pull shift lever all the way down. Remove dash bezel from around gauges and switch (it just pops loose). This takes a little time getting it off from around steering column, etc. Just be gentle and patient. Snap out old switch, unsnap wiring, replace with new switch, snap in, replace dash bezel and you're done! There is a video on uTube showing steps. His 4X4 works perfect now and I get to tease him Double benefit. This was on a 1999 Chevy Silverado 1500. Let me know how it goes. Good Luck! -Marilyn
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