DTC Summary

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

DTC	Monitoring Item	Malfunction Detection Condition	Trouble Area	Detection Timing	Detection Logic
P2420	Vent valve stuck open (vent)	Following condition met during key-off EVAP monitor: EVAP pressure change when vent valve closed (ON) less than 0.3 kPa-g (2.25 mmHg-g)	Canister pump module (Reference orifice, leak detection pump, vent valve) Connector/wire harness (Canister pump module - ECM) ECM	While ignition switch off	2 trip

HINT:

The vent valve is built into the canister pump module.