Cracking the PO446 Code The Key to Evaporative Emissions System Health

the po446 dtc is checking for a blocked evap path. it does this by commanding the purge valve open and watching for vacuum build up from the ... So my truck is giving the code P0446 which is evap emission control system vent circuit malfunction. I have read a bunch of the posts on ... I understand that this code refers to the vapor canister. However, I wanted to see if there is anything in particular that I have to look for ... P0446 Evaporative Emission Control System Vent Control Malfunction · Navbar Menu · P0446 Evaporative Emission Control System Vent Control ... Chased around a P0446 code for a week and finally fixed it today. 1. Replaced gas cap - code came back 2. Replaced Vent valve - $30 - code came back 3. Took ... P0446 is a result of a test failure. The PCM closes the vent solenoid and opens the purge valve. It then monitors the fuel tank pressure sensor. A P0446 error code indicates an evaporative emission control system (EVAP) vent control circuit malfunction. Simply put, the computer has ... The code is for a blockage in the ventilation system though, which should be either a clogged filter in the canister, a bad shutoff valve or a ... General Technical & Electrical - P0446 EVAP Vent Control Circuit - Hey everyone! My 2007 2.3L gave a code P0446 : Evaporative Emission ... I have an 03 tundra v8 that sets a P0442 & P0446 code every spring. There is a toyota service bulletin for P0446 that says to test and replace the VSV valve.