DTC P1441: EVAP System Flow During Non-Purge: Description
WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Powertrain Control Module (PCM) monitors amount of vacuum pressure in Evaporative Emissions (EVAP) system by monitoring Fuel Tank Pressure (FTP) sensor signal. PCM seals EVAP system by commanding EVAP purge solenoid off and EVAP vent valve on. PCM monitors FTP sensor to determine if EVAP purge solenoid is leaking vacuum to EVAP system. This DTC sets if vacuum in EVAP system is more than a predetermined value within a predetermined time.