P0447: Evaporative Emission Control System Vent Control Circuit Open
Low SeveritySafe to drive (short-term)EVAP System
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.
Estimated repair costFrom €50 to €600+, varies by vehicle
What does P0447 mean?
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.
What are the symptoms of P0447?
If your vehicle has triggered P0447, you may notice one or more of these symptoms:
Check engine light illuminated
Faint fuel smell from the canister area in rare cases
Failed emissions test
No noticeable driveability issues
May appear alongside P0455 or P0457 because the vent valve cannot seal
What causes P0447?
Here are the most common causes of P0447, ranked by how likely they are to be the culprit:
highFailed vent valve solenoid (open coil)
highBroken or chafed wire to the vent valve
mediumCorroded vent valve connector (often from underbody mounting)
lowFailed ECU driver circuit (rare)
mediumLoose ground at the vent valve circuit
Is it safe to drive with P0447?
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.
How do you diagnose P0447?
Follow these steps to pinpoint the root cause of P0447:
Locate the vent valve. On most vehicles it is bolted to the charcoal canister near the rear axle or fuel tank. Inspect the connector for corrosion, road salt damage, or a loose lock
Disconnect the valve and measure solenoid resistance with a multimeter. Expect 20 to 35 ohms on most designs. An infinite reading confirms an open coil and a failed valve
With the connector unplugged, back-probe the harness side and check for 12V on the supply pin (key on, engine off). No voltage means a wiring fault between the ECU and the valve
Inspect the wiring from the ECU to the vent valve for chafing, rodent damage, or breaks. The harness often runs along the underbody and is exposed to road debris
Use a scan tool to command the vent valve on and off. Listen for a clear click. If the valve is silent and resistance is in spec, suspect a wiring or ECU fault
How much does P0447 cost to fix?
Repair costs for P0447 vary depending on the root cause and your vehicle. Here are typical estimates:
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Repair wiring or connector at vent valve
€10–€40
€40–€120
€50–€160
Moderate
Replace EVAP vent valve solenoid
€40–€150
€30–€80
€70–€230
Moderate
Replace charcoal canister with integrated vent valve
€100–€400
€80–€200
€180–€600
Professional
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0447 on specific vehicles
P0447 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:
P0447 on BMW 3 Series
BMW 3 Series • 2005–2024
BMW E90/F30 vehicles use a leak detection pump assembly that combines the vent valve and a pump motor. When the LDP fails it often sets P0447 alongside other EVAP codes. The unit is mounted at the rear of the vehicle and is exposed to road salt. A full LDP assembly is significantly more expensive than a standalone vent valve.
What causes P0447 on a BMW 3 Series?
BMW 3 SeriesFailed leak detection pump assembly (LDP) on E90/F30
BMW 3 SeriesCorroded LDP connector from road salt exposure
P0447 repair cost for BMW 3 Series
Estimated costs for BMW 3 Series ownersadjusted higher than average due to BMW-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Repair wiring or connector at vent valve
€14–€56
€56–€168
€70–€224
Moderate
Replace EVAP vent valve solenoid
€56–€210
€42–€112
€98–€322
Moderate
Replace charcoal canister with integrated vent valve
€140–€560
€112–€280
€252–€840
Professional
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0447 on Volkswagen Golf
Volkswagen Golf • 2005–2024
On the Mk5 and Mk6 Golf, the vent valve is integrated into the charcoal canister near the rear axle. The wiring connector is a common failure point because it sits low on the chassis and collects moisture. Test the harness before condemning the canister.
What causes P0447 on a Volkswagen Golf?
Volkswagen GolfCorroded vent valve connector on Mk5/Mk6 underbody
Estimated costs for Volkswagen Golf ownersadjusted higher than average due to Volkswagen-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Repair wiring or connector at vent valve
€12–€46
€46–€138
€57–€184
Moderate
Replace EVAP vent valve solenoid
€46–€173
€35–€92
€81–€265
Moderate
Replace charcoal canister with integrated vent valve
€115–€460
€92–€230
€207–€690
Professional
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0447 on Audi A4
Audi A4 • 2005–2024
The B7 and B8 A4 share EVAP components with the VW Golf. The N115 vent valve on the canister is the typical failure for P0447. Audi part availability is good through ATU, Autodoc.de, and kfzteile24.de, with aftermarket valves around 40 to 60 EUR.
What causes P0447 on a Audi A4?
Audi A4N115 vent valve failure on B7/B8
Audi A4Harness chafing where it crosses the rear subframe
P0447 repair cost for Audi A4
Estimated costs for Audi A4 ownersadjusted higher than average due to Audi-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Repair wiring or connector at vent valve
€13–€50
€50–€150
€63–€200
Moderate
Replace EVAP vent valve solenoid
€50–€188
€38–€100
€88–€288
Moderate
Replace charcoal canister with integrated vent valve
€125–€500
€100–€250
€225–€750
Professional
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0447 on Ford Focus
Ford Focus • 2005–2024
On the Focus Mk2 and Mk3, the vent valve (Ford calls it the canister vent solenoid) is mounted on top of the canister near the rear of the vehicle. The connector pins corrode after several winters of road salt exposure. Cleaning the connector and applying dielectric grease often resolves intermittent P0447 codes.
What causes P0447 on a Ford Focus?
Ford FocusCanister vent solenoid connector corrosion on Mk2/Mk3
Ford FocusWire chafe near the rear suspension on Mk3 wagon variants
P0447 repair cost for Ford Focus
Estimated costs for Ford Focus ownersadjusted lower than average due to Ford-specific parts pricing
Repair
Parts Cost
Labor Cost
Total Estimate
DIY Difficulty
Repair wiring or connector at vent valve
€9–€36
€36–€108
€45–€144
Moderate
Replace EVAP vent valve solenoid
€36–€135
€27–€72
€63–€207
Moderate
Replace charcoal canister with integrated vent valve
€90–€360
€72–€180
€162–€540
Professional
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related diagnostic codes
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.
Can I drive with P0447?
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.
Is it always the vent valve, or could it be the wiring?
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.
How much does a P0447 repair cost?
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.
Scan your car with Skanyx to diagnose P0447
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