P0446 Evaporative Emission Control System Vent Control Circuit

Powertrain Severity: Low Generic OBD-II

Fault in the EVAP vent valve circuit or operation.

Common causes

  • Faulty vent valve
  • Blocked vent filter
  • Wiring damage

Symptoms

  • Check engine light
  • Fuel pump nozzle clicks off early when refuelling

What to check

  1. Check vent valve
  2. Inspect vent filter
  3. Check wiring

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0446, follow the service information for that make and model.

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