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I have run into to this problem many times on these trucks, i have seen your problem and also where the 4wd high light wont work but 4wd low and 2wd work fine and the 4 wheel drive works fine. on your truck i will bet its the transfer case selector motor. the motor is what turns the lights on when in the selected mode which goes through the 4wheel module under the dash, this sounds like a bad selector motor and that where i would start. this motor is located on the transfer case, it bolts to the rear of it.here is a picture of it to help you locate it. good day.
I have seen this happen way to many times. Pull the light switch out, unplug and replug the wiring harness to the switch and then test it. If that does not work, then you may be looking at a bad switch.
on the top side by where the front drive shaft comes out of the transfer case there is a vacuum switch with 3 vacuum lines going to it that needs replaced if im thinking right ..... replace switch and ur fixed........hope it helps
Be sure to put the truck in neutral, while engine is running, while you disengage from 4 wheel drive (low) to 4 wheel drive (high) and then finally to 2 wheel drive. It is critical to shift transmission into neutral when switching out of 4WD Low, as indicated in your owner's manual. Hopefully, this will help to FixYa problem!
I have recently had this problem with a customer. It seems the 4x4 low will only engage in neutral with the brake applied. And also check fuse. Then select drive and you will feel it lock in. Don't "goose" the fuel when attempting this.
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