Conditions for Setting the DTC

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The EVAP system is not able to achieve or maintain a calibrated level of vacuum, less than 2.74 kPa (11 in H2O), before a calibrated amount of purge volume has passed through the system.
After setting the DTC for the first time, 2 L (0.5 gal) of fuel must be consumed before setting this DTC a second time.