Question about 2003 Lexus RX 300

1 Answer

P0446 - 2003 Lexus RX 300

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 6,784 Answers

P0446 - Evaporative Emission Control System Vent Control Circuit Malfunction.

Hi. The evaporative vent valve has only one purpose. It closes to seal the vent so that the evaporative system can pressurize and ensure there are no leaks. Evaporative vent valve is usually supplied Battery voltage with the ignition key on. The ECM's driver controls the ground circuit, and when grounded, activates the valve. If the ECM detects a short to ground, and open,or a short to your battery voltage on the control circuit, This P0446 will set. This Code also may refer to your ECM detecting that the evaporative system is unable to achieve or maintain vacuum during test, as well. Here are a few possible causes for this code:

1.Faulty vent valve
2.Open, short or excessive resistance on Vent valve control circuit
3.Blockage of vent valve
4.Defective PCM/ECM<--------Not likely but possible


First; Check the power and ground circuits that lead to the vent valve that is malfunctioning at this time. Make sure that all wiring and connectors to and form the engine computer are sound and not loose or ripped form their respective locations. If the circuits are ok, simply, replace the evap vent control valve.

Posted on Sep 04, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How to fix code p0446 on a pontiac g6

P0446 Evaporative Emission Control System Vent Control Circuit Malfunction. The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP).

Jan 25, 2017 | Pontiac Cars & Trucks

1 Answer

Got code p0446 on my grand am what is it

Evaporative Emission Control System Vent Control Circuit Malfunction

the following links can assist you with problem P0446 OBD II Trouble Code p0446 Yahoo Video Search Results

Sep 29, 2016 | Cars & Trucks

2 Answers

I got a code p0446 and u1153 what is wrong

P0446Evaporative Emission (EVAP) Vent System Performance=ECM, PCM

U1153 Loss of Communications with HVAC

Mar 09, 2015 | Cars & Trucks

1 Answer

P0446 s10 blazer

code p0446 refers to evaporate emission (EVAP)system-vent control--circuit malfunction===causes--wiring--EVAP--canister purge valve--ECM
replace the purge valve

Dec 30, 2013 | Cars & Trucks

1 Answer


P0446 HYUNDAI - EVAP Emission System Vent Control Valve Open Circuit

Possible causes- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Vent control valve harness is open or shorted
- Vent control valve circuit poor electrical connection
- Faulty vent control valve

Dec 20, 2012 | Hyundai Motor 2003 Sonata

2 Answers

P0440, P0441, P0446

where is Evap Emission Control System Purge Flow fault

Jul 02, 2009 | 2000 Toyota Celica

1 Answer

Code p0446 1997 nissan maxima

how did you fix your p0446 code?

Apr 21, 2009 | 1997 Nissan Maxima

Not finding what you are looking for?
2003 Lexus RX 300 Logo

1,081 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lexus Experts


Level 3 Expert

76846 Answers


Level 3 Expert

907 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a Lexus Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides