DTC P0457:00: Notes

DTC P0457:00	EVAP system leak detected (fuel cap loose/off)
DETECTION CONDITION	P0457:00 indicates that the initial vacuum could not be achieved after a refueling event and the purge vapor flow is excessive (gross leak). Diagnostic support note This is an intermittent monitor (EVAP system). A check cap light will be illuminated after a malfunction has been detected on one driving cycle. The check cap light will be extinguished after the monitor has run without a malfunction (same or subsequent drive cycle). The MIL will be illuminated after a malfunction has been detected on three consecutive driving cycles. The MIL will be extinguished after three consecutive driving cycles where the monitor was run without a malfunction. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Missing or loose fuel filler cap PCM malfunction