What does code P0446 mean on a BMW and is it safe to drive?
P0446: Evaporative Emission System Vent Control Circuit. Here's what it means on your BMW, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The PCM has detected a problem with the EVAP vent control circuit, often caused by a stuck or failed vent valve.
Common causes for your BMW
- Failed EVAP vent solenoid
- Corroded wiring or connector at vent valve
- Blocked vent due to dust, rust, or spider webs
Symptoms
- Check Engine Light
- Possible difficulty filling fuel tank (nozzle keeps clicking off)
Typical fixes
- Replace EVAP vent valve/solenoid
- Clean or clear vent and charcoal canister area
- Repair wiring
Repair cost range
For a BMW, repairs for P0446 often fall between $150 and $450, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on BMW
BMW P0446 usually involves the DMTL pump or the vent valve. BMW uses a combined vent valve and pump module. Confirm the fault with ISTA diagnostics—activate the DMTL module to verify function before replacement.
Most commonly affected models
3 Series E46 2001–20055 Series E39 2001–2003X5 E53 2000–2006