Conditions for Setting the DTC

WARNING: This page is about a different car, the 2016 Cadillac ATS. 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 the fuel tank pressure sensor reading is less than -3.0 kPa (-12 in) H2O of vacuum for 5 s before 6 L (1.6 gal) of purge volume.
OR
If the fuel tank pressure sensor reading is greater than 0.62 kPa (2.5 in) H2O of pressure or less than -1.24 kPa (-5 in) H2O of vacuum for 60 s.
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.