Jeep cherokee mil light on code po193 how to repair turn light of vehicle is in limp home mode

SOURCE: 2005 jeep grand cherokee limited 5.7 hemi vehicles hesitates

The egr valve is located on the front of the right cylinder head. It has a tube attached to it and going to the intake manifold.It has failed and is why your jeep is running rough and hesitating. Replace it and it will fix your driveabllity issues. Disconnect the battery for 2 min to clear the code.

SOURCE: 2007 Jeep liberty auto trans will not shift from 2nd

YOU NEED TO HAVE TRANSMISSION CONTROL SYSTEM SCANNED..IT HAS DETECTED A PROBLEM IN THE ELECTRICAL SYSTEM,INTERNAL OF TRANS OR A SENSOR FOR TRANSMISSION..A TRANSMISSION IS AN EXPENSIVE COMPONENT..YOU SHOULD GET IT CHECKED ASAP..ESPECIALLY IF YOU HAVE NO WARRANTY LEFT

SOURCE: 2003 Jeep Grand Cherokee check engine light stays

go to autozone they will check codes for free

SOURCE: I have a 1999 Jeep Grand Cherokee. The vehicle

sounds like the key is either worn down to where the ridges in the key wont push the tumblers inside the key lock cylinder into their proper place to move the cylinder into the starting position. Or your steering colum is locked and the wheel is moving freely as if it were not. So your solution would be to either have an expert look at it (estimated cost: 200$ low/400$high) or you can attempt to fix it yourself.
should you choose the "I'll fix it myself" method....try getting a new key made at a hardware store since keys wearout over time (ie:10years of turning that old key), this may solve the problem right away if the ridges are just worn on the key. Or the hard way, you need to get a phillips screwdriver and some jewelers tools and an 8mm or 10mm wrench/rachet+socket to disconnect the battery, then underneath the steering colum just under the ignition is a hole in the colum shroud/cover, from there you can disconnect the ignition key lock cylinder (the thing you put your key into). once you've removed the cylinder from the steering colum you should test your key again to see if you can turn the cylinder outside of the colum if you cannot then buy a new ignition key lock cylinder for about 15$-30$...problems solved.

SOURCE: transmission doesn't shift, stays in one gear

The point you are at now is when you should have a good transmission shop do a "ride along" scan test to determine if the problem is in a control unit or the trans itself. The control module takes information from the engine management system as well so if something such as your throttle position sensor on the throttle body has failed (or even the map sensor) the trans control may not allow proper shifting.
While it is possible to do continuity and individual component tests on the entire system,(to a point) the fastest and most accurate means of diagnosis is to have a shop do that for you. Then, if you want, do the actual repair work yourself!