The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0447.
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.
Typical repair cost, all makes€50 - €600
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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 patterns noted for BMW models:
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, probe the harness-side terminals for supply voltage (key on, engine off). Check a wiring diagram first: on a valve the ECU switches on the ground side, the supply comes up with the main relay and no reading at key-on can be normal, so confirm what the circuit should do before chasing a fault
- 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
- Command the vent valve on and off with a diagnostic tool that supports actuator tests (often manufacturer-level software; a generic OBD2 reader usually cannot) and 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 for P0447 in EUR, compiled across makes. Expect BMW parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0447
These codes are often seen alongside P0447 or point to related issues, on any make:
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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