This DTC code refers to the evaporative emission control system (EVAP) and indicates that a part of it does not work correctly.
The Evaporative Emissions Control System (EVAP) consists of the gas cap, fuel lines, carbon filter, purge valve and other hoses, its objective is to control the emissions and thus avoid the leakage of fuel vapors from the vehicle fuel system.
The fuel vapors are connected by means of hoses to a carbon filter, which stores them. At the moment the engine is running a purge control valve opens and thus gives way to the intake vacuum so that the fuel vapors in the engine are diverted. These fuel vapors are stored, and the purge valve allows the vacuum of these, but they are not expelled into the atmosphere, but they are burned. A vacuum switch is used to detect when there is a flow.
If the PCM (Powertrain Control Module) activates the purge valve and sees that the switch is closed, indicating that there is no purge flow detected and DTC code P0441 is established.