OBD Code P0446

Evaporative Emission System Vent Control Circuit

What’s mean?

OBD2 Code P0446 Definition:
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

Possible sumptoms of P0446
There will be no obvious symptoms to driver, other than MIL illumination.

Possible Causes

Possible causes of P0446
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

OBD-II Codes

P0440 P0441 P0442 P0443 P0453 P0455 P0456