I tried the other day in the right conditions to switch to 4 wheel low.....the light blinked for it seems about 20 seconds and goes back to 4 wheel high....is something broke....am I just not using the proper procedure to engage 4 wheel low????? Any help would be much appreciated!!!!!

 

4LO should be switch on in Neutral and at a full stop. See if that works and then let us know how it goes.

 

Check out the owners manual on the proper way to switch between 4HI Lock and 4LO Lock. Remember you have to be in neutral below 5mph!

 

MOVED: This is not an FAQ, please read this about the FAQ section: https://www.hummerforums.com/forum/h...section-19461/