There could be many causes.
First, is your Jeep smoking (blue smoke out of exhaust)? If yes, is it more intense when accelerating or decelerating?
How many miles?
Being 2009 it's fairly new, so it's very unlikely that it is a wear issue. Most likely your problem is limited to one cylinder. It could be a broken ring or a defective valve guide. You can identify the faulty cylinder by pulling out the spark plugs. If one (or more) are visibly more dirty than the rest, this(these) cylinder(s) is(are) the one leaking oil. Once you have identified the bad cylinder, you need to remove the head and check the valves. If the valve guides / seals are OK, then you need to fully disassemble the engine and get the pistons out.
If spark plugs are clean and there is no smoke, then most likely you have a leak, not an oil burning problem.
In any case you should still be covered under the powertrain warranty.