I replaced 2 tires on my 2012 gt now the 4wd light is on. The front tires that i replaced were completely bald and the rear are still in the green not sure what to do

 

Do not run uneven tread depths on a 4WD/AWD vehicle. You're getting a warning because you're overheating the system and potentially wrecking it. Replace all four tires at the same time. Also, if you're regularly rotating your tires, you shouldn't be bald on two and good on the others.

 

the only caveat is if you can disable the awd system and run in 2wd unless in snow. I forget what year Mitsubishi took away the 2wd option from the Outlander.

 

My 2007 can run 2, 4 or 4 lock, but if you're getting a warning light after you replaced your tires, you should probably address it immediately. I don't know that disengaging 4WD necessarily protects the system from running mismatched tires in modern AWD systems.

 

I suggest the OP should download the Service and Body Repair manual from this forum first. While what has been suggested here makes sense a lot of things can cause the problem (see the attached image with AWD related DTCs).

A cheap code reader is a good investment. Once the proper DTC is identified, the manual offers solutions. If the size and the pattern of the installed new tires are the same my best guess is that the tire shop overinflated the new tires. I doubt that tire shops would care to read the recommended air pressures. What would worry me is that the OP claims that the front two tires lost all thread. It is not normal to have such a profound difference in the threadware unless the history of the tires is revealed. The OP did not report any warning light before changing the tires despite they had vastly different threads in front and back, so the uneven thread is unlikely to trigger the warning light. If no ABS failure light is triggered one can safely eliminate the wheel speed sensor failure but DTC reading is the key to start the problem solving.

 

100% agree. Early 2nd gen Outlanders AWD can go into 2wd mode.....vast majority of awd cannot.

I've changed only two one time, but I kept it in 2wd for about a year or so. Never got a light, but knew enough to keep it out of awd on dry pavement. Early 2nd gen can go purely 2wd. At some point, they removed that option when they relabeled the options and the eco mode was something like a permanent 85/15 split....or something like that.