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In the 2017 GMC Acadia and other cars, think of the check engine light as a general indicator for problems. It's hard to pinpoint exactly what's causing it without checking the diagnostic trouble codes with an OBD-II scan tool, but here are some common reasons. An issue with the EVAP emission system is often the main culprit in a '17 Acadia, sometimes as simple as a loose gas cap. It may also signal the need for new spark plugs, or issues like a faulty thermostat or oxygen sensor. If you can't test with an OBD-II scan tool, many auto parts stores offer free code readings to help narrow down the issue.
If the "check engine light" comes on in your 2017 GMC Acadia, it could mean there's a loose gas cap or a more serious problem such as a faulty O2 sensor, a bigger emission leak, or issues with the catalytic converter in your vehicle.