P0444 Fault Code

Evaporative Emission Control System Purge Control Valve Circuit Open

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

The P0444 fault code indicates an issue with the Evaporative Emission Control System (EVAP), specifically related to the purge control valve circuit being open. This system is designed to prevent fuel vapors from escaping into the atmosphere, and the purge control valve is crucial in managing the flow of these vapors to the engine for combustion. An open circuit in this context means that the electrical signal to the valve is interrupted, causing improper operation of the system.

• The EVAP system helps reduce harmful emissions.
• The purge control valve opens during certain engine conditions to allow fuel vapors to be drawn into the engine.
• Changes in pressure within the EVAP system can cause the check engine light to illuminate if the purge valve is malfunctioning.

What are the symptoms of the P0444 code?

Common symptoms associated with the P0444 code include:

• Check Engine Light illuminated on the dashboard.
• Poor fuel economy due to inefficient vapor control.
• Difficulty in starting the engine or engine stalling in some cases.
• Increased emissions which may cause the vehicle to fail an emissions test.

What causes the P0444 code?

Several factors can contribute to the P0444 code:

• A faulty purge control valve that does not close properly.
• Electrical issues such as damaged wiring or bad connectors within the circuit.
• A failed Engine Control Module (ECM) that incorrectly reads the signal from the purge valve.
• Problems with the overall EVAP system causing the valve to malfunction.

How to fix P0444?

To resolve the P0444 fault code, follow these steps:

• Inspect the purge control valve for any physical damage or blockage and replace if necessary.
• Check the wiring and connectors leading to the purge valve for any signs of damage or corrosion. Repair or replace as needed.
• Use a multimeter to check the electrical signal to ensure the ECM is sending the correct signal to the valve.
• Clear the fault code and perform a test drive to see if the issue reoccurs. If it does, further diagnostics may be needed.