07 Tahoe 4WD switch issue; wish it was manual

[KYHeritage04]

Ok..so today I turned the 4wd switch to Auto and I noticed that the light under Auto started blinking, but then the light under 2-hi came back on. I then switched the knob to 4WD and the light and truck when into 4wd. I tried to put the truck into 4-LO and the light blinks and then the light goes back to 2wd.

So basically I have 2-HI and 4-HI, both are working great. But no Auto or 4-LO.

Any ideas???? I wish they when back to manual, I've never had a problem with my 1982 Farm truck