my 4wd works the problem is the indicator lights on dash keep flashing, on 2007 GMC Canyon

I checked some fuses,looked at wires under truck around transfer case. 2wd is good 4wd High and 4wd low is good its just that the indicator flashes on what ever one i'm using keeps flashes on 2wd or 4wd or 4wd low I have it on 2wd for now won't stop flashing.

Asked by for the 2007 GMC Canyon
Have the Transfer case Control Module scanned for codes, then post so that we can advise.