2018 Audi P0446: What It Means & Is It Safe to Drive?
P0446 on the 2018 Audi: Evaporative Emission System Vent Control Circuit. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe 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 on the 2018 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 2018 Audi, repairs for P0446 typically fall between $150 and $450, depending on the root cause and labor rates in your area.
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