Evaporative Emission Control System Vent Control Circuit Open
What does P0447 mean?
The P0447 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Vent Control Circuit Open. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Difficulty refueling -- pump nozzle clicks off repeatedly
- Fuel vapor odor
- Failed emissions inspection
Probable Causes (Ranked by Likelihood)
- Open circuit in vent valve wiring Very High
- Failed vent control solenoid High
- Corroded connector at the vent valve Moderate
- Damaged ECM vent valve driver circuit Low
Step-by-Step Diagnostic Procedure
-
Locate the vent valve (usually near the charcoal canister at the rear of the vehicle) and inspect the connector
-
Check for continuity in the vent valve wiring from the ECM to the valve using a multimeter
-
Measure vent valve solenoid resistance -- typically 10-30 ohms
-
Apply 12V directly to the vent valve to confirm operation
-
Inspect wiring harness along the undercarriage for damage from road debris
Frequently Asked Questions
Can I drive with code P0447?
Yes. The vent valve circuit issue does not affect engine performance. You may notice difficulty refueling if the tank cannot vent properly. Repair before your next emissions test.
Where is the EVAP vent valve located?
The vent valve is typically mounted on or near the charcoal canister, which is usually located under the vehicle near the fuel tank or in the rear wheel well area.
Is P0447 common on Nissan vehicles?
Yes. Nissan vehicles are known for vent valve failures, particularly the Altima and Rogue. The vent valve solenoid on these models tends to fail after 80,000-120,000 miles.