P0447 means the ECU detected an open electrical circuit on the EVAP vent control valve. The vent valve seals the charcoal canister during EVAP system testing. An open circuit usually points to a broken wire, a corroded connector, or a failed solenoid coil inside the valve itself.
P0447 means the ECU detected an open electrical circuit on the EVAP vent control valve. The vent valve seals the charcoal canister during EVAP system testing. An open circuit usually points to a broken wire, a corroded connector, or a failed solenoid coil inside the valve itself.
P0447 is a evap system-related diagnostic trouble code classified as low severity. When your vehicle's ECU detects this condition, it stores P0447 and illuminates the check engine light.
If your vehicle has triggered P0447, you may notice one or more of these symptoms:
Here are the most common causes of P0447, ranked by how likely they are to be the culprit:
Generally yes, for short-term driving. P0447 is a circuit fault on the EVAP vent valve and does not affect engine performance or safety. You can drive normally, but the check engine light will fail any EU emissions inspection. Repair before your next test.
Follow these steps to pinpoint the root cause of P0447:
Repair costs for P0447 vary depending on the root cause and your vehicle. Here are typical estimates:
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0447 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:
These codes are often seen alongside P0447 or indicate related issues:
Yes. The check engine light will cause an automatic fail at any EU vehicle inspection (TÜV, ITV, TA, SKP). The vent valve is a monitored component, so the ECU will not run the EVAP readiness test until the circuit is fixed.
Yes, the code does not affect engine performance, fuel economy, or safety. The only practical impact is the check engine light and the failed emissions test. Repair within a few weeks to avoid related EVAP codes piling up.
About 60 to 70 percent of P0447 cases are a failed solenoid coil inside the vent valve itself. The remaining cases are wiring damage, especially on vehicles where the valve is mounted underbody and exposed to road salt and debris. Always measure resistance before replacing the valve.
A new vent valve runs 40 to 150 EUR in parts plus 30 to 80 EUR labour, for a total of 70 to 230 EUR. Wiring repairs are typically 50 to 160 EUR. If the canister-mounted valve is integrated and not separately serviceable, expect 180 to 600 EUR for the full canister assembly.
Your car logged P0447. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €50-€600 repair range so you know the number before a shop quotes you.
Download Skanyx