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There are several hundred reasons why you may get a light but notice no performance or operational issues. With a very wide variety of systems being monitored, it's impossible to narrow down likely causes from the description of your experience.
Any potential cause offered here without knowing the code is 100% pure speculation and has more potential to lead you down the wrong diagnosis path spending more time, money and aggravation.
As others have said, you need to read the code(s). OnStar will do it. I believe most chain Auto Parts stores will do it (for free), But as others suggested, for about 1/3 the price of a fill-up, you can buy a cheapo code reader for the future or a surprisingly powerful OBDII interface and phone app for some real-time information...
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