P0446 — Evaporative Emission Control System Vent Control Circuit Malfunction
Category: Powertrain Severity: Low
Updated:
DTC code P0446 means: Evaporative Emission Control System Vent Control Circuit Malfunction. It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include faulty EVAP vent valve, blocked vent line and wiring/connector issue; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Faulty EVAP vent valve
- Blocked vent line
- Wiring/connector issue
Symptoms
- Check engine light
- Fuel smell
- No driving symptoms
How to diagnose it step by step
- Locate the vent valve (near the canister).
- Check it opens and closes when commanded.
- Check whether the vent filter is clogged with dirt.
- Replace the valve.
How to fix it
Check the fuel cap and the EVAP system hoses and valves.
Estimated repair cost
Vent valve: $40–150.
Frequently asked questions
What does DTC code P0446 mean?
Evaporative Emission Control System Vent Control Circuit Malfunction.
Is code P0446 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0446?
Yes, no risk.
Related codes
P0447 P0443 P0449 P0442 P0441 P0440 P0452 P0453 P0455 P0456
Refine by car make
- Audi P0446: Vent valve or clogged line.
- BMW P0446: EVAP vent valve.
- Citroën P0446: Fuel cap or canister.
- Fiat P0446: Fuel cap or purge valve.
- Ford P0446: EVAP vent valve.
- Honda P0446: Fuel cap or purge valve.
- Opel P0446: Fuel cap or vent valve.
- Peugeot P0446: Fuel cap or canister.
- Renault P0446: EVAP vent valve.
- Toyota P0446: EVAP vent valve.
- Volkswagen P0446: Vent valve or clogged line.
🛒 Buy EVAP purge valve at Autodoc (affiliate link)