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Tank venting and fuel vapours

P0446 Charcoal canister vent valve not working

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P0446 means: Charcoal canister vent valve not working. The canister vent valve lets air into the fuel vapour system. OK to drive, but have it checked soon. The repair usually costs about €40–250 in Estonia. The most common cause: vent valve has failed or is clogged with dirt.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.
Typical repair cost€40–250parts and labour in Estonia

What it means

The canister vent valve lets air into the fuel vapour system. The engine computer can't control this valve properly.

What could be wrong

  1. 1Vent valve has failed or is clogged with dirt
  2. 2Valve connector or wire
  3. 3Charcoal canister is blocked

What you can check yourself

The valve is usually under the car near the tank, where mud and road salt get to it. Check the connector. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We check the valve operation
  2. We clean it or repair the wiring
  3. We replace the valve

Standard SAE description: EVAP System Vent Control Circuit

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

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Questions

What does fault code P0446 mean?

Charcoal canister vent valve not working. The canister vent valve lets air into the fuel vapour system. The engine computer can't control this valve properly.

Can I drive with code P0446?

OK to drive, but have it checked soon.

How much does it cost to fix P0446?

Roughly €40–250 in Estonia. The price depends on exactly what has failed and on the car.

How is P0446 fixed?

We check the valve operation. We clean it or repair the wiring. We replace the valve.

Related codes

P0440Fault in the fuel vapour (EVAP) systemP0441Tank purge not working properlyP0442Small leak in the fuel vapour systemP0443Fault in the purge valve wiringP0449Fault in the canister vent valve wiringP0451Tank pressure sensor reads wrongP0455Large leak in the fuel vapour systemP0456Very small leak in the fuel vapour system

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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