Why isn't my 4wd working?

Austinscar2

I have a 2005 chevy trailblazer LT and only one of my 4wd options works And that would be 4 low. 4AWD and 4 hi say they are engaged but do not work. I was wondering if anyone has had a similar or same problem. Just don't understand why 4 low would work but nothing else

Mr_Shiftright

Is your service 4WD light on? You may need to extract trouble codes from the transfer case module before anything else.

Autoserviceking18

If this kind of thing keeps happening I would recommend going to a garage and getting the front differential looked at. You may have to replace it. Are you hearing a grinding noise when putting it into 4WD?