Diagnostic Aids

If DTC P0441 is the only EVAP DTC set, the most likely cause is a malfunctioning EVAP canister purge valve. Inspect the EVAP canister purge valve carefully for faulty connections and erratic operation.
The information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set. If the Freeze Frame data indicates the engine was not running when the diagnostic ran and failed, the fault is probably a leak in the EVAP system.
A faulty EVAP canister can cause a DTC P0441 and P0455 to set. Test the EVAP canister for internal passage leaks and restrictions. Also test the canister for the correct operation of diaphragms, check balls, and internal valves. Refer to Evaporative Emission Control System Diagnosis .
An intermittent malfunction may be caused by a fault in any of the EVAP solenoid electrical circuits. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .