in my 2000 chevy there are three buttons you can use, 2 wheel hi, 4 wheel hi, and 4 wheel low. when i go to use 4 wheel low the light tht shows you which your on jsut blinks and then goes back to 2 wheel hi. anyone know whats up?

 

Yea for 4 low i think u have to put it into nutrual then try it.

 

id say your switch is not getting the actuiator to actuate into 4x4 either the switch or the actuator i bet.

 

Its gotta be scanned...but I imagine your encoder motor is out,not letting it shift

 

Like krazyballer said make sure you put the truck in neutral if you go in to 4 wheel low. If you go from 2 hi to 4 hi you can just shift. Thanks