Question about 2000 Toyota Camry

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Check engine light with p0446 code - 2000 Toyota Camry

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Evaporative emissions control vent circuit low= p0446
1) Make sure the gas cap is ON (and "clicks" ) and is the correct Toyota Gas Cap (aftermarket may not work). Clear the codes and run for a while. See if codes come back.
2) Make sure the tube to the electrical valve on the air cleaner is still on - Many clumsy oil change places pull these off accidentally (or on purpose- who knows?)
3) Test and inspect all the rubber lines under the hood and connecting to the canister.
4) Test the VSV Electrical valve on the canister - put 12V across it using 2 small alligator clips and wires (RadioShack) It should click and let air through.
5) Test the other 2 valves under the hood the same way (the one on the air cleaner works backwards i.e. Power = Block Airflow)
6) If you can - test the air valves (seen above) -
7) Bend over - get your wallet out and buy a new Charcoal canister - ouch! $300+ If you are still getting the "whoosh" on taking the cap off, maybe the Pressure sensor in the tank is bad.

Posted on May 20, 2011

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P0446 Evaporative Emission Control System Vent Control Circuit Malfunction Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
SymptomsThere will be no obvious symptoms to driver, other than MIL illumination.
CausesA code P0446 could mean one or more of the following has happened:

  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible SolutionsWith a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

Posted on May 20, 2011

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Po446, toyota tsb ref # eg022-06 (issue date 4/11/06)- remove gas cap and check fuel fill pipe for corrosion, check seal on gas cap for damage from corrosion on fill pipe. Replace fill pipe and gas cap.

Posted on Nov 23, 2012

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Posted on Jan 02, 2017

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SOURCE: p0446 code

Hi, check out this article, it's detailed on what to check: http://www.obd-codes.com/p0446

Posted on Mar 14, 2009

motor1258
  • 6674 Answers

SOURCE: check engine light on,results in code P0446-fuel emission cotrol

Well it could be as simple as a new gas cap, or clean seal on it & tighten again. There are a few other items in the system too, but one common one is the vapor canister gets plugged up with dust & dirt.

Posted on Apr 11, 2009

GARYca
  • 672 Answers

SOURCE: Evaporative Emmission System Malfuction----p0446

Possible leaks, clogs, malfunctioning VSVs (vacuum switching valves), and faulty Evap charcoal canister. This system is designed to remove harmful vapors in the fuel system and preventing these vapors to enter the atmosphere, regulate fuel pressure, by sending it into the combustion chamber to be burnt.

Diagnostics for P0446:
1. Inspect vacuum hoses and pipes
between EVAP (Purge) VSV and
Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and
Canister.

Hopefully this helps

Posted on Aug 16, 2009

czaa
  • 4514 Answers

SOURCE: check engine light is on

you hav egr valve problems n evap emissions flaws-ull need a repair manual if ur the mech-buy one at a parts place-clymer n haynes r the best

Posted on Sep 20, 2009

  • 1986 Answers

SOURCE: check engine code "P0446 Evap Control System Vent Control Circ"

Unfortunately, this code has nothing to do with the gas cap....
A code P0446 could mean one or more of the following has happened:

  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Here are some things you could try to fix it:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM


Posted on Nov 17, 2009

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1 Answer

I GOT A 1998 SILVERADO 4X4 ENGINE LIGHT ON CODE P0446


Well code 446 is for a problem with the EVAP system which vents fumes from the gas tank to the vapor canister.
You would need to check the system using a test chart for that code.
You can look online for the test procedure and the equipment required.

Feb 03, 2014 | 1998 Chevrolet Chevrolet silverado

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My check engine light has been on and the code is p0446. the car is a 2001 olds silhouette


I was able to find this about the code you specified, I hope it answers your questions.

It deals with: Evaporative Emission Control System Vent Control Circuit Malfunction

More information and the source I found, is below.

http://www.obd-codes.com/p0446

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3 Answers

The check engine light stays on or comes back on when doing smog test. It passed everything on the smog test except check engine light. The indicator code is P0446.


Hi:
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
copyscape.gif Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:
  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

Nov 20, 2009 | 1997 Ford Explorer AWD

1 Answer

Check engine code "P0446 Evap Control System Vent Control Circ"


Unfortunately, this code has nothing to do with the gas cap....
A code P0446 could mean one or more of the following has happened:
  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Here are some things you could try to fix it:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM


Nov 17, 2009 | 2002 Toyota Corolla

1 Answer

P0446


Check for any damage to the cap or on the wiring if no damage is visable replace the cap.

Aug 27, 2009 | 2007 Ford Explorer Eddie Bauer

1 Answer

Code p0446 1997 nissan maxima


how did you fix your p0446 code?

Apr 21, 2009 | 1997 Nissan Maxima

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