Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

If DTC P0441 is the only EVAP DTC set, the most likely cause is an inoperable EVAP canister purge valve. Check EVAP canister purge valve carefully for faulty connections and erratic operation.
An intermittent malfunction may be caused by a fault in any of EVAP solenoid electrical circuits. Check wiring harness and components for an intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 1.8L VIBE article.
If the DTC cannot be duplicated, information included in freeze frame data can be useful in determining vehicle operating conditions when DTC was first set.
Operating vehicle in CHECK MODE will increase the ability of the PCM module to detect engine control system malfunctions. See SERVICE BAY TESTS under SELF-DIAGNOSTIC SYSTEM.