P0446
Evaporative Emission Control System Vent Control Circuit
System: EVAP
Severity: medium
What does P0446 mean?
The DTC P0446 (Evaporative Emission Control System Vent Control Circuit) is a fault code stored by the ECU when it detects a EVAP vent valve condition in the evap subsystem. It is commonly seen on European and Asian vehicles using Bosch, Continental, Siemens or Denso ECUs.
Common causes of P0446
- Failed canister vent valve (CVV)
- Wiring fault
- Spider infestation (real — they love CVV)
- Mud/debris blockage
How to fix P0446
Spider screen kit if vehicle parked outside. Replace valve if internally failed.
Tuning approach with DaVinci Deluxe
For P0446, DaVinci Deluxe offers the following ECU map adjustments and software solutions:
- EVAP DTC suppress (race)
Need to fix P0446 on your ECU?
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