P0446 on Honda City GM2: Evaporative Emission Control System Vent Control Circuit Malfunction

Short answer: P0446 means “Evaporative Emission Control System Vent Control Circuit Malfunction”. The car’s computer has found a fault in the Emissions system and turns on the Check engine light (MIL). First check: read the code and live data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code

P0446

System

Emissions

Dashboard light

Check engine light (MIL)

Applies to

Generic OBD-II meaning. Not every code is used by this car.

Confidence

medium (generic OBD-II definition, not checked against the factory manual for this car)

Source

obd-codes.com

Symptoms and when it is set

1. Check engine light on

Likely causes

1. Faulty vent valve
2. Open, short or excessive resistance on Vent valve control circuit
3. Blockage of vent valve
4. Bad PCM

What to check, in order

1. Read the code and live data with an OBD-II scanner
2. Look for exhaust or vacuum leaks and check the wiring of the sensor or valve
3. Test the part before replacing it
4. Fix the cause, clear the code and test-drive

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• P0446 · Toyota Corolla (11th gen, E170)
• P0446 · Toyota Corolla (10th gen, E140)
• P0446 · Honda Civic (10th gen, FC)
• P0446 · Suzuki Wagon R (Pakistan, K10B)
• P0446 on all cars compared

← P0443 P0455 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.