Circuit/System Verification
WARNING: This page is about a different car, the 2013 GMC Acadia, 2013 Chevrolet Traverse, and 2013 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
Review the I/M System Status indicators. All I/M System Status indicators should report YES and no I/M Test DTCs should be present.