P0441
EVAP System Incorrect Purge Flow.
- Generic
- Powertrain
- Generic code
- Low severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 4
- AreaAuxiliary emission controls
- 41
- FaultThe specific fault in that area
What it means
P0441 is the generic SAE J2012 code for incorrect purge flow in the evaporative emission (EVAP) system. The control unit commanded the purge valve to open and expected a measurable change, such as a fuel trim shift, a pressure or vacuum change in the system, or a change in tank pressure. It did not see that change, or it saw flow when none was commanded, so it set the code.
Symptoms
- Check engine light on
- Difficulty or slow refuelling, with the pump clicking off repeatedly
- Rough or unstable idle after refuelling
- Slight smell of fuel vapour
- Failed emissions test
- Usually no noticeable drivability change
Possible causes
- Purge valve (canister purge solenoid) stuck open, stuck closed or failing electricallylikely
- Cracked, split, disconnected or blocked EVAP or purge hoses and pipeslikely
- Faulty, missing or poorly sealing fuel filler cappossible
- Blocked, saturated or damaged carbon canister, or a stuck vent valvepossible
- Faulty tank pressure sensor or EVAP pressure sensor giving incorrect readingspossible
- Wiring or connector fault on the purge valve circuit, such as corrosion, chafing or a poor pin fitpossible
- Damaged filler neck or fuel tank, or a leaking tank sender seal (depends on the model)rare
How to diagnose
- Read the stored codes and freeze frame data, noting engine load, temperature and fuel level when the fault set. Check for other EVAP, fuel trim or misfire codes.
- Check the fuel filler cap is fitted, undamaged, has an intact seal and clicks tight.
- Visually inspect the purge valve, vent valve and their connectors and wiring for damage, corrosion or chafing.
- Inspect all accessible EVAP hoses and pipes between the tank, canister and intake for cracks, kinks, perishing or loose joints.
- Command the purge valve with a scan tool and listen for clicking. Check its resistance and its supply and control signals against the manufacturer's specification.
- Check the purge valve for sticking by applying vacuum or a low-pressure test as the manufacturer specifies, and check that it holds when closed.
- Check the canister and vent valve for blockage or damage, and monitor the tank pressure sensor reading against a known reference. The test method varies by model.
- Carry out a smoke test on the EVAP system to locate leaks that are not visible.
How to fix
- Replace the faulty purge valve if it sticks or fails electrical tests.
- Repair or replace damaged EVAP hoses, pipes or connectors.
- Replace a faulty or incorrect fuel filler cap with a correct one.
- Replace a blocked or damaged carbon canister or a faulty vent valve.
- Replace a faulty tank pressure sensor, or repair the associated wiring and connectors.
- Repair or replace a damaged filler neck, tank or sender seal if found to be leaking.
Can I keep driving?
Low severity
The car can normally be driven while you book it in, as this code rarely affects safety or running. Do not ignore a strong fuel smell or leak, and get it checked promptly, as it can lead to an emissions test failure.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.