Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The EVAP leak detection pump is commanded ON, and the EVAP leak detection pump switching valve transitions from vent to not venting, pump, position. If all conditions are not met after 5 s, then the EVAP leak detection pump switching value is stuck and the P2450 sets.