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Some vehicles may have a MIL illumination with DTC's P0441, P0442, P0455, or P0456 stored in memory. To determine the location of the evaporative system leak, follow the repair procedure below. P0441 - Evaporative emission control system incorrect purge flow P0442 - EVAP system leak detected (small leak) P0455 - EVAP system leak detected (gross leak) P0456 - EVAP system leak detected (very small leak) NOTE: P0441 is a DTC for purge flow, however, it can be stored when evaporative emissions are leaking from the fuel filler cap. Evaporative emissions leak from the fuel filler cap when the cap is not closed properly after refueling. When diagnosing an evaporative emissions leak from the fuel filler cap, DO NOT TOUCH the fuel filler cap.