Possible Cause

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD and 2019 Nissan NV2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

P0444

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

P0445

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