Why does my 2015 chevy equinox cut off with no warning

Hello, These issues can be attributed to a broad variety of engine and transmission control components, and you really will need to seek diagnosis to identify the culprit. If the check engine light is on, scanning with a regular code reader will shed some light on the situation, however, without the check engine light, the only option (and best option) is the dealership for warranty repair. If you are already out of warranty, and the dealer quote is outrageous, I recommend getting a quote elsewhere.