Possible causes

– Missing Fuel cap
– Incorrect fuel filler cap used
– Fuel filler cap remains open or fails to close
– Foreign matter caught in fuel filler cap
– Incorrect fuel tank vacuum relief valve

Tech notes

The P0441 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0441 code.

When is the code detected?

Pressure in charcoal canister and fuel tank does not drop during purge control (2 trip detection logic)

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Possible a noticeable fuel odor caused by the release of fuel vapors

P0441 Description

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:
– Large and small leaks
– Excess vacuum
– Purge flow during non-commanded conditions
– Fuel Level and Fuel Pressure sensor faults
– EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.

P0441 Information for specific makes

P0441 INFINITI
P0441 TOYOTA
P0441 NISSAN
P0441 BMW
P0441 CHRYSLER
P0441 DODGE
P0441 JEEP
P0441 HYUNDAI
P0441 KIA
P0441 LEXUS
P0441 MAZDA
P0441 MITSUBISHI
P0441 SUBARU
P0441 VOLKSWAGEN
P0441 AUDI
P0441 SCION
P0441 1999 TOYOTA CAMRY