What would cause my 2013 Buick Verano check engine light to come on?

If the check engine light comes on in Your 2013 Buick Verano the first thing You should do is try to stop driving as soon as possible. Driving with a check engine light on can damage components if there are any physical problems. Once You are stopped You can use an OBD II scan tool on Your engine to read why the light turned on. There are hundreds of different codes that could be thrown to Your engine. It could be something as simple as a loose gas cap, or as complexAs failed components in Your engine. Without reading the ECU there is no way to know for sure why the light turned on at Your dash.