I'm sorry to hear about the check engine light you've experienced.
The Malfunction Indication Light (MIL) is designed to monitor the engine and transmission control systems. The light can illuminate for a number of reasons and can be as simple as a loose gas cap or even poor fuel economy. If the light stays on through a couple drive cycles, I can suggest a visit to your Chrysler dealer to determine what may have prompted the light.
If the light begins to flash, immediate service would be necessary.