Conditions for Setting the DTC
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Manifold Absolute Pressure = Greater than 2. 48 kPa (0. 73 mmHg, 10 in. H2O) For 5 s - EVAP Purge/Seal = Not Venting