Conditions for Setting the DTC

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

There are two stages to setting this DTC. Stage one, prep test, then stage two test.

If fuel tank pressure sensor reading is greater than 2.5 in H2O of pressure or less than - 5 in H2O of vacuum for 60 s.
OR
If fuel tank pressure sensor reading is less than -12 in H2O of vacuum for 5 s before greater than 6 L (1.6 gal) of purge volume.
After setting the DTC for the first time, 2 L (0.5 gal) of fuel must be consumed before setting the DTC for the second time.