P0447
Evaporative Emission Control System Vent Control Circuit Open
Get Your FREE AI Diagnostic Report
Enter your vehicle for a personalized diagnosis for code P0447
The P0447 code tells you the ECM has detected an open circuit in the EVAP vent control valve wiring. This means there is a complete break in the electrical connection to the vent solenoid—either a broken wire, a disconnected connector, a blown fuse, or a burned-out solenoid coil. Without this electrical connection, the ECM cannot close the vent valve during self-tests or normal EVAP system operation.
This code is common on Nissan, Infiniti, and Subaru vehicles. Since the vent valve and its wiring are typically located underneath the vehicle near the fuel tank or charcoal canister, they are exposed to road debris, water, salt, and general underbody wear and tear. The connector is particularly vulnerable to corrosion in harsh climates.
Diagnosis starts with locating the vent solenoid (check near the charcoal canister, often near the rear of the vehicle) and inspecting its connector. A disconnected plug is the simplest fix. If connected, use a multimeter to check solenoid resistance—an infinite reading means the coil is open and the solenoid needs replacement. Trace the wiring back toward the ECM checking for breaks. This is typically a low-cost, DIY-friendly repair.
Severity
Symptoms
- •Check Engine Light is on
- •Difficulty filling the gas tank—nozzle repeatedly clicks off
- •Possible fuel odor near the vehicle
- •Failed emissions inspection
- •Hissing when removing the gas cap
Likely Causes
A broken or disconnected wire between the ECM and the vent solenoid, often caused by road debris damage or corrosion at the vehicle's underside.
The vent solenoid's internal coil has burned open, creating infinite resistance and preventing the valve from being controlled by the ECM.
The electrical connector at the vent solenoid has become disconnected or corroded, common given the valve's exposed underbody location.
The fuse providing power to the vent valve has blown, cutting off all electrical communication with the solenoid.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Repair or replace open wiring in the vent valve circuit
- Replace the EVAP vent solenoid
- Reconnect or replace corroded vent valve connector
- Replace blown fuse
- Apply dielectric grease to connectors to prevent future corrosion
Shop Parts
Videos
P0447 Code Explained: Evaporative Emission Control System Fix |
WeeklyTools
Causes and Fixes P0447 Code: Evaporative Emission Control System Vent Valve / Solenoid Circuit Open
HVAC Mechanic
How to Fix P0447 Code: Step-by-Step Guide@FourWheelsEmpire
Four Wheels Empire