What is the probable cause of p0441 trouble code in an OBD2 system?

Answer 1

evap emmision system. purge solenoid not operating, or vacuum line broken between engine and charcoal cannister, near gas tank, underside of vehicle. solenoid may also be unplugge damaged, or engine computer could be defective.

On my 02 Intrepid it was the EVAP bleeder filter mounted just behind the fuel tank. I found this solution by checking the vacuum switch mounted on the carbon cannister. An answer I found on the justanswer website. Post copied included below.

Hello inspector 13, The set condition for this trouble code po441 has nothing to do with the oxygen sensor changing voltage when the purge valve opens up.

The Pcm gradually increases purge flow. During flow the PCM looks for the NVLD (natural vacuum leak detection) switch to close. If the PCM does not see the switch close at maxium flow an error is detected.

First pull up the lower cushion for the back seat, there is a wiring connector on the right side. We always check this first because we had a couple vehicle with corroded connections.

The problem we at Chrysler, are finding is the internal switch at the NVLD is not working properly and closing as it should.

This unit is located on the right side of the gas tank, and is part of the charcoal canister.

REMOVAL

1. Disconnect the negative battery cable.
2. Remove fuel tank, refer to the Fuel Delivery section for Fuel Tank Removal.
3. Disconnect the electrical connector from the NVLD assembly.
4. Disconnect the hoses from the NVLD assembly
5. Lift tab on NVLD assembly and twist the assembly counterclockwise and pull up to remove from EVAP canister
6. Remove O-ring from EVAP canister .

View Full Image