Code P0441 Definition
Evaporative Emission Control System Incorrect Purge Flow
Code P0441 Meaning
The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. When the vent control valve opens, the fuel vapors from the fuel tank travel through a vent line to the charcoal canister. The fuel vapors are then absorbed and stored by activated charcoal pellets in the charcoal canister. On the charcoal canister is a purge valve. When the purge valve is opened, the vacuum from the engine draws the fuel vapors out of the charcoal and into the engine intake manifold where it is then used as part of the air-fuel mixture needed for combustion within the cylinders of the engine. However, when check engine light code P0441 is set, the purge valve is not properly regulating the flow of the fuel vapors by allowing too much flow or too little flow.
Symptoms of Code p0441
- Check Engine Light
- Rough Idle
- Erratic Idle
Causes of Code P0441
- Faulty purge valve (solenoid)
- Damaged or cracked charcoal canister
- Loose, damaged, or missing gas cap
- Damaged or loose EVAP hoses
Code P0441 Severity – Low
Code P0441 does not pose any serious danger to the driver or the vehicle and there are no drivability issues that may occur. However as the case with all Check Engine Light codes, it should be fixed as soon as possible to prevent any further damage to your vehicle.
Code P0441 Common Diagnosis Mistakes
Replacing purge valve (solenoid) without making sure that it is the issue.
Code P0441 Diagnosis Steps
How To Diagnose P0441
- Thoroughly inspect gas cap to make sure that it is properly tightened.
- Do not forget to inspect the gas cap seal as well.
- Visually inspect the charcoal canister to make sure that there are no damages or cracks.
- Check the vacuum hoses to make sure that they are all connected securely.
- If you have not been able to find the problem in the previous steps, you will need to check your purge valve (solenoid) to make sure that there are no leaks within that system.
- You will be using your vacuum pump gauge to test your purge valve
- How-to test your purge valve can be found in your car’s service manual or a Hayne’s Repair Manual to find more information on car specific testing procedures. Below (Step 5) is a general guideline.
- How to Test Purge Valve (the video below provides more specific information):
- Disconnect the vent line connected to the purge valve. The vacuum pump gauge will be connected to the purge valve in place of the vent line.
- Pump the vacuum pump gauge to 17 psi. When the vacuum is applied the valve should hold the vacuum and not leak.
- If the vacuum drops (the needle on the pump gauge moves), the valve should be replaced.
- Apply battery voltage to the purge valve. You should hear an audible click as the purge valve opens, and the pressure on the vacuum pump gauge should drop. If it does not open, the purge valve is faulty and must be replaced.