have a 2001 blazier 4x4 automatic trans. Just noticed when pushing 4hi botton it just flashes, same with 4lo. any ideas would be helpful

 

mine did the same thing. could be several things including resetting the computer by disconnecting battery for fifteen minutes, or a sensor or switch is not satisfied. good luck.

 

Thanks--will try removing terminals to battery for 15 minutes---I did get it to go into 4low and can hear it go in but no 4hi, so i'm thinking a loose wire in module. ( wow, I can spell button) thanks for help