Question about 2000 Chevrolet Prizm

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Code p0446 keeps coming on , what part do i need to buy and replace on the engine, and where is it located i have a 2000 prizm. help please. andy

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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


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Posted on Sep 05, 2010

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