00 KiA Sportage 4wd Locking Up on Turns

Sportage drives fine in 2wd.
It drives fine in 4wd straight or gradual turns.
When the sportage is in 4wd it can Not make sharp right or left turns or Uturns
The wheels seem to lock up

Anyone have any ideas?

NOrmal and must be avoided totally. Thus truck must NEVER NEVER NEVER be operated on hard surface in 4WD. This is a "part time 4WD", with a solid link (no differential) between the front and rear driving shafts so it cannot compensate for different wheel speed between front and rear when in turning . It will eventually bust the hubs, or the front differential, or the transfer case.

Are you serious? Do you know how many drivers wish their front differential would lock up? this is not a problem it is awesome!
Your Sportage is meant to be driven in 2wd 95% of the time, 4wd in mud/snow and offroad. It is very hard to make a sportage lock the front differential on purpose. in 2wd only the rear differential in engaged, so the front is free to spin.
Do you know how this happened? did the previous owner do some work to the front differential? Please let me know. Myself and a bunch of other Sportage drivers are looking to lock up the front diffs.

the Sporty does NOT have a third differential (normally part of transfer case) between front and rear drive shafts . That is why it is labelled a part time 4wd. In a turn, the front wheels run a larger circle than the rear wheels so there should be a difference out of the Tcase between the front and rear drive shafts that is handled by a third differential. In the SPorty, both shafts are FORCED at same speed hence this Tcase lock up condition should be totally avoided on dry surfaces. Never run in 4WD on dry surface except in straight line. Catastrophic damage to transfer case can result and has been described in this forum...I will search for the pictures and post them eventually.
THE advantage on muddy surface is that the front wheels WILL be driven (not locked up left and right though unless you do have a lock-up front differential) whatever the condition of rear wheels, even if the latter are hung up in the air with the rear differential bottomed on a rock. THis is the condition labelled 4LOCK on full feature 4WD transfer cases.