Question about 2004 Ford Expedition

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P0446 code on a 2004 ford expedition 5.4 - 2004 Ford Expedition

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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.

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

I hope help with this (remember to rate and comment this).

Posted on Oct 02, 2010

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That is an EVAP code. WHat that means is you evaporative emission system showed a fault long enought to set a diagnostic trouble code. A majority of the time this code is set because a fuel cap was not properly seated after fueling the vehicle. Did this code set shortly after adding fuel to the vehicle?
It isn't as common but the code can also be set by other components of the EVAP system including the fuel cap itself, the EVAP Purge Valve, Fuel Tank Pressure sensor, A leak somewhere in the EVAP System plumbing, or even the Powertrain Control Module (computer). However, the first thing to check and the most likely culprit if the fuel filler cap.

Posted on Oct 02, 2010

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Posted on Jan 02, 2017

SOURCE: What's your problem?2004 ford expedition service engine soon light

I assume you resolved the issues by now

Check lights have been on all vehicles for 31 years,
so you shouldn't be asking about them

Does not matter what light comes on your dash

The procedure is always the same
Check for codes
Diagnose & repair code related issues first

Posted on Aug 30, 2012

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I assume you resolved the issues by now

Check lights have been on all vehicles for 31 years,
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Hope this help (remember comment and rated this).

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P0446 code is related to the Evaporative Emission Control System Vent Control Circuit Malfunction. Anytime a "CIRCUIT" is involved it can be the component itself OR the wiring and connector that goes to that component. Sometimes it can be the controller but not very often. On most vehicles the vent control system is part of the emissions canister. You'll need to contact the dealer and ask them. Hope this helps and have an awesome day jh9848.

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