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.
DTC/P0447·BMW
P0447 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)BMW
P0447 on a BMW 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.
Repair cost on BMW€70 - €840
What does P0447 mean on a BMW?
BMW 3 Series
2005–2024BMW 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?
Beyond the generic causes listed on the main P0447 page, these are the BMW-specific patterns we see most often:
BMW 3 SeriesFailed leak detection pump assembly (LDP) on E90/F30
BMW 3 SeriesCorroded LDP connector from road salt exposure
How to diagnose P0447 on a BMW with OBD2
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 on a BMW? (EUR)
Estimated repair costs on a BMW (BMW parts and labour typically run 40% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0447 on BMW
These codes commonly cluster with P0447 on BMW vehicles:
FAQ: P0447 on BMW
Will P0447 cause my car to fail emissions?
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.
Looking for the full P0447 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0447 guideSkanyx · BMW
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