Circuit/System Verification
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. 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.