Possible Cause

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0444

Harness or connectors (The solenoid valve circuit is open or shorted.)
EVAP canister purge volume control solenoid valve

DTC P0445

Harness or connectors (The solenoid valve circuit is shorted.)
EVAP canister purge volume control solenoid valve
ECM power supply