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Canister vent and solenoid clogged. causing gas cap light to be on

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  • yadayada
    yadayada May 26, 2011

    What is the OBD2 fault code?



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If you know that these are clogged, then replace've already done the diagnostics.

Posted on May 26, 2011


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My 2004 Hyundai sante Fe will not start after gas fill up, I need to hold gas pedal down and feather the pedal till it stays running.

purge valve solenoid/ purge vent/ purge canister... NEVER TOP OFF GAS!!! ruins evap system and activated charcoal from purge canister enters lines clogging purge valve solenoid, problem often causes fuel nozzle to "click" multiple times while fueling

Dec 22, 2016 | Hyundai Santa Fe Cars & Trucks

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2007. What are the probable causes of DTC P0446?

DTC P0446: Evaporative Emissions (EVAP) Vent System Performance
Circuit/System Description
This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge solenoid valve Open and the EVAP canister vent solenoid valve Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge solenoid valve Closed and the EVAP canister vent solenoid valve Open. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inch H2O in a calibrated time, this DTC sets.
Diagnostic Aids
An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.

An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.

An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .

Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system

Do you have a scan tool that reads data PID'S ?
Your FTP - fuel tank pressure sensor could be at fault !

    Ignition ON and fuel cap removed, verify that the FTP sensor parameter is between 1.3-1.7 volts. ?‡'
    If not within the specified range, go to the FTP sensor section in Circuit/System Testing.

  1. Install the fuel cap.
  2. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 12 inches H2O.
If the fuel tank vacuum is greater than the specified range, go to the restriction section in Circuit/System Testing.


Sep 06, 2015 | Chevrolet Impala Cars & Trucks

1 Answer

Why I can't fill gas tank on Subaru Forester? It shut off as if the gas tank is full .

the vent control valve on the charcoal canister is clogged or stuck preventing the air to escape from the gas tank causing the gas to back up in the fill tube and shut off the pump. if this is the case your check engine light should be on... P1443 indicates a problem with the evap vent control solenoid valve. some auto part stores will get the codes from your vehicle for free and tell you what could be causing it. although you have to be careful some codes can be caused by one thing and be the cause for the code on another part. an example is your problem, a clogged vent hose from the gas tank to the vent solenoid can throw this code or it can be the valve itself.

Feb 15, 2015 | 2010 Subaru Forester 2.5

2 Answers

Check fuel cap light coming on, replaced twice - still on. ideas?

It sounds like you have a large evap leak. The cap is most likely not the cause. You could have a hole in any numerous evap lines or in the fuel filler neck. Also the canister vent solenoid could be malfunctioning. Your best bet is to have an emissions certified shop test the system with a smoke tester. They need to have a scan tool capable of actuating the canister vent solenoid.

Mar 19, 2013 | 2002 Ford Explorer Sport Trac

2 Answers

Obd code p0457 fuel cap replaced mil reset defect not cleared connection checked ok

The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

Jul 23, 2012 | Honda Accord Cars & Trucks

1 Answer

Service engine soon light came on, replaced gas cap it went off but a week later it came back on, when it try to fuel the truck it spill the gas back out like it is a full tank

One of the most common causes, is blockage in the venting system from fuel entering the vent lines and into the charcoal canister, the fuel gets absorbed by the charcoal canister causing it to swell and block vent lines. the gas tank contains both fuel and air. when you fill it up the gas displaces the air and the air has to go somewhere. but the air that is displaced is full of gas vapor so the gas vapor goes to the vent lines and into the charcoal canister, when the charcoal canister swells up it prevents the air from escaping the tank, canister could be clogged,canister filter may need replacement,electrical connection to the close valve may be open,canisterf might be damaged,purge valve from canister might be clogged,vent hoses might be clogged, the vent hose could be clogged, or the vent hose may have a kink. all this is caused by overfilling the gas tank, getting that last drop of gas in the neck of the fill tube.
good luck!

Aug 11, 2011 | 2005 Nissan Titan

3 Answers

I need to know what p0440 means

The technical meaning of the code is Evaporative Emission Control System Malfunction.

P0440 EVAP System No Flow can occur during the following conditions:
Fuel filler cap might be loose
  • Leak in the fuel tank, fuel filler neck or fuelsending unit 'O' ring.
  • PCM might have failed.
  • Purge vapor line might have clogged.
  • Purge or vent solenoid power circuit is open .
  • Fuel tank pressure sensor is damaged, disconnected or it failed.
  • Charcoal canister is filled with fuel or moisture.

Mar 16, 2011 | Buick LeSabre Cars & Trucks

2 Answers

What is code 455 (Check engine soon light) on my 2004 Chevy Trailblazer, 4.2l


Sep 20, 2010 | Chevrolet TrailBlazer Cars & Trucks

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

1 Answer

Error code p0446 for 2001 cevrolet malibo

There is a pressure loose in your EVAP system, the best ting to do and the cheapest is to replace the gas cap. Don't buy a cheap gas cap, go buy a dealer gas cap for your car and hope that will address the issue, if the code is still there. Then move to the next common problem and that would be the vent on the charcoal canister could be dirty and clogged or there may be a solenoid vent valve failure. These are just a few common things to look for. Recap: change the gas cap, check the vacuum tubes to the charcoal canister and vent to see if there is dirt in the vacuum line. Good luck and hope this helps. Keep me posted, be glad to help

Jun 15, 2009 | 2001 Chevrolet Malibu

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