DTC P0441, DTC P0442, DTC P0446 & DTC P0456: Notes

WARNING: This page is about a different car, the 2003 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Code Definition

DTC P0441: EVAP Emission Control System Incorrect Purge Flow
DTC P0442: EVAP Emission Control System Leak Detected (Small Leak)
DTC P0446: EVAP Emission Control System Vent Control Circuit
DTC P0456: EVAP Emission Control System Leak Detected (Very Small Leak)

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.