Stabilitrak
 

2012 Chevy equinox with stabilitrak light on how can I fix it

It's hard to suggest anything without any information to work with. We'd at the very least need a troublecode. It could be a number of different things, but it could be something simple like a bad battery.

At this point I think you should take your vehicle to an auto parts store and have the battery & alternator tested. If you're lucky they may have a scantool that can retrieve troublecodes related to Stabili-Trak.