P0446 Fault Code

Evaporative Emission Control System Vent Control Circuit Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0446 fault code indicates a malfunction within the Evaporative Emission Control System, specifically related to the vent control circuit. This system is responsible for capturing and recycling fuel vapors from the fuel tank to prevent harmful emissions from escaping into the atmosphere. When the vent control circuit fails, it can lead to increased emissions and potential issues with fuel efficiency.

What are the symptoms of the P0446 code?

• Check Engine Light illuminated
• Poor fuel economy
• Difficulty starting the vehicle
• Fuel smell around the vehicle
• Possible emissions test failure

What causes the P0446 code?

• Damaged or faulty vent control valve
• Blocked or kinked ventilation hoses
• Electrical issues such as short circuits or damaged wires
• Faulty engine control module (ECM)
• Corroded connectors or poor connections in the wiring harness

How to fix P0446?

• Conduct a thorough inspection of the vent control valve and hoses for damage and blockage
• Test the electrical connections and wiring for continuity and damage
• Replace any faulty components such as the vent control valve
• Clear the fault codes and test drive the vehicle to see if the issue returns
• If necessary, reprogram or replace the engine control module