How to make your signature so we can serve you better:
1. Log on and click "My Preferences".
2. On the "My Preferences" page click the middle box and enter your rig info.
3. Scroll to the bottom and click "Submit Changes"
4. Exit and you're done.
There are several hundred codes that can light your CEL. Without knowing what code is presenting itself there is no way to know what the problem may be.
I've purchased three OBD II code readers over the years due to CEL.
The CEL light is the single largest revenue source for auto dealers, bar none.