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P0446 Evaporative Emission Control System Vent Control Circuit

OBD-II Trouble Code Technical Description

Evaporative Emission Control System Vent Control Circuit Malfunction

What does that mean?

This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model.

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 12V battery 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 Malfunction Indicator Lamp (MIL) illumination.

Causes

A code P0446 could mean one or more of the following has happened:

Possible Solutions

With a P0446 OBD-II trouble code, here are some things to try:

Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445 - P0447 - P0448 - P0449 - P0452 - P0453 - P0455 - P0456

Related P0446 DTC Discussions

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