DTC Summary

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P0446-73	EVAP System Vent Valve Stuck Closed Actuator Stuck Closed	Following condition is met during key-off EVAP monitor: EVAP pressure change when vent valve on (closed) less than 0.3 kPa [0.04 psi]	Canister pump module (reference orifice, leak detection pump, vent valve) Connector or wire harness (Canister pump module - ECM) Canister (filter inside canister clogged) ECM	Comes on	Engine	A	SAE Code: P2422 DTC for Mexico Models: Does not apply

DTC No.	Monitoring Item	Detection Timing	Detection Logic	SAE
P0446-73	Vent valve (built into canister pump module) stuck closed	EVAP monitoring (ignition switch off)	2 trip	P2422

HINT:

The vent valve is built into the canister pump module.