What does code P0446 mean on a Audi and is it safe to drive?
P0446: Evaporative Emission System Vent Control Circuit. Here's what it means on your Audi, 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 Audi
- 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 Audi, 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 Audi
Audi P0446 EVAP vent control fault typically involves the carbon canister vent solenoid (N115) or LDP pump. Use VCDS to test solenoid actuation. On older B7 A4 models, the N115 connector corrodes—clean the connector before replacing the solenoid.
Most commonly affected models
A4 B7 2005–2008A6 C6 2005–2011TT 2006–2014