Conditions for Setting the DTC

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.

The control module detects a leak in the EVAP system that is greater than a calibrated amount.
The control module must complete several EONV tests before the diagnostic can turn the MIL ON or OFF.