Have a 2011 Unlimited. About 5 months ago, had to have the throttle body adjusted due to some rough idling. Got a check engine light at the time. Since then, no issues. However, whenever I turn the key to the "ON" position (before turning to "Start", where all the electronics turn on), the check engine light keeps coming on. Then, when I start the engine, it goes away. Not sure WTF is going on - maybe it's not a big deal, but I hate seeing it come on every time I go to start the car and the last time I took to the dealership, nothing changed. For just under a year since I purchased, I don't expect ANY lights to remain on that shouldn't.