Question about 2002 Isuzu Rodeo

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2002 Isuzu Rodeo computer code p0446 probably from dust in the emission control charcoal cannister. Where is the cannister? Where can I find image? Is it like an inline filter?

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  • Steve Hurc
    Steve Hurc May 11, 2010

    which engine is in vehicle?

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Diana2009: p0446 is a "Very" common code to pop up!
9 out of 10 times it has to do with the gas cap. The cap may have been loose or it may be failing. It is an EVAP code.
Do not buy an aftermarket cap! Buy an original equipment cap.
The aftermarket caps are often cheap, ones made in China and do not work or will not last very long.
Before spending money on any diagnostics in a shop, your truck is old enough where the cap could very well be the problem. It's a cheap enough gamble. You can probably get AutoZone to cancel the light for you for free.

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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What does code p0446 mean on a 2001 Buick Centry?


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). The description of the fault varies between different car manufacturers, but one thing is common, the code P0446 doesn't directly point to a defective part; some testing might be required to pinpoint the faulty component. What can cause the code P0446: - faulty vent control valve - blockage at the vent hose, vent filter or vent control valve - open or short in the vent control valve circuit - bad charcoal canister - EVAP system leak - faulty EVAP system pressure sensor - bad vacuum switching valve (VSV) - stuck open purge valve (solenoid)

Aug 13, 2014 | 2001 Buick Century

1 Answer

The check engine light is on. the scan reads 441 and 445


1st. Make sure your fuel filler cap is tight, clean, and sealed well.
These are codes set when there is a fuel vapor leak.

P0441 EVAP Control System Improper Purge Flow.
P0446 EVAP Control System Vent Control.

This indicated a problem with the evap emission control system. This is the part of the emission controls that captures gas vapors in the tank, stores them temporarily in a charcoal canister, and then burns them by "purging" the charcoal canister into the intake.

Could be something as simple as a loose or faulty gas cap. Can also be vacuum lines for the purge valve and canister or a bad purge valve itself.

This code is infamous code, its a bit complicated if not mechanical incline, I would recommend finding an of duty Toyota mechanic to do a side job. There are plenty of those guys will do side work and will save you big bucks, however you will have to asked around when you get the next oil change. any repair manual will have proper instructions. same time, purge valve is either bad or clogged. i'd, also, clean EGR valve.

the cannister is mounted in the rear underside of car above the rear crossmember,you either have to remove the exhaust or lower the rear crossmember to gain access to the charcoal cannister.. there is also a vsv valve that mounts on the air cleaner housing.
these would be the 2 common items that can set these codes although there can be other issues that can set the codes you have
most of the testing is done with a scan tool . and vacuum pump there are a few test to do with a voltmeter.
http://youtu.be/FQFULrEY3NE

Nov 22, 2011 | 2005 Toyota Corolla

2 Answers

What does the diagnostic code P0446 for a 2001 isuzu rodeo mean?


Hi, your vent valve has malfuntioned. The vent valve is near the tank, and has a hose to the tank and a solenoid to close it. Check the wiring/connector. If OK, try applying 12 volts directly to the solenoid. If it does not click when voltage is applied, replace the solenoid/valve.

P0446 Evaporative Emmission Control System Vent Control Circuit OBD-II Trouble Code Technical Description

Evaporative Emission Control System Vent Control Circuit Malfunction
What does that mean? 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.
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

May 14, 2011 | Isuzu Rodeo Cars & Trucks

1 Answer

WHAT CAN I DO TO SOLVE PROBLEM CODE PO446.


P0446 = Evaporative Emission Control System Vent Control Circuit failure - the circuits that control the charcoal cannister are faulty or they are detecting a failure in the valves. Check the tank cap, the valves and the vacuum tubes to the cannister.

Aug 23, 2010 | 1998 Lexus ES 300

2 Answers

2002 Buick Century, when the tank is 1/4 full,


P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

The evaporative emission control system checks to make sure there are no leaks in the lines that run from the gas tank to the charcoal canister and up to the engine. It also checks to make sure the gas cap is sealing correctly.
It may just be that the cap was not on tight and the code was tripped.

A dusty environment can also clog the vent line and cause this code.
Have the code cleared and see if it comes back. Some auto parts stores like Auto Zone can read and clear the codes for you.
Hope this helps.

Sep 02, 2009 | 2002 Buick Century

2 Answers

I have a 2001 Sienna and havs the P0446 code. What


Evaporative emissions control vent circuit low http://wiki.answers.com/Q/What_does_OBDII_code_P0446_Evaporative_emissions_control_vent_circuit_low_mean


Jun 20, 2009 | 2002 Toyota Camry

2 Answers

Emission Control Systems Malfunction


Check the gas cap! However, if you need more ...
We have pictures and our experiences with these codes and how to tell if it's the canister, the valves or the cap.

http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htm

May 23, 2009 | 1997 Toyota T100

1 Answer

I like to now how to fix the code 0446 on kia optima 2001 2.4l engine. thanks


P0446 - Vent Control of the Evap System. This Evaporative Emissions System is very complicated. These particular DTCs (Diagnostic Trouble Codes) can be caused by MORE than they tell you. Three MAJOR components in the system can cause this P0446. 1. Charcoal Canister, 2. Charcoal Canister Filter, 3. Canister Close Valve, 4. Fuel Tank Pressure Sensor, 5. Purge Control Solenoid Valve, 6, Wiring and/or connector/connections between them and the ECU. If you wish to trust the computer's diagnostics, then replace the canister close valve (after you have inspected the Evap Charcoal Canister's air filter and find no problems with restrictions of air flow). If the problem comes back, check the Purge Control Solenoid Valve and the operation of the Fuel Tank Pressure sensor - either one of those components, if malfunctioning, can cause a P0446.

Apr 19, 2009 | 2001 Kia Optima

1 Answer

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.

Apr 11, 2009 | 2002 Chevrolet Tahoe

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