Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. 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 H20) 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.