P0457

P0457-LOOSE FUEL CAP






For a complete wiring diagram refer to: Electrical Diagrams

When Monitored
Ignition on Ambient Temperature between 4°C and 32°C (39°F and 89°F) Close Loop fuel system. Test runs after the medium leak test is inconclusive and the PCM has sensed a fuel increase.

Set Condition
The PCM activates the EVAP Purge Solenoid to pull the EVAP system into a vacuum to close the NVLD switch. Once the NVLD switch is closed, the PCM turns the EVAP Purge Solenoid off to seal the EVAP system. If the NVLD switch reopens before the calibrated amount of time after a fuel tank fill, an error is detected. Two Trip Fault. Three good trips turn off the MIL.

Possible Causes
- LOOSE OR MISSING FUEL CAP

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. DTC IS ACTIVE

NOTE: If DTC P0455-EVAP SYSTEM LARGE LEAK is set along with this DTC, perform the diagnostic procedure for P0455 before continuing with this test.

NOTE: Do not replace the gas cap for DTC P0457-EVAP SYSTEM-LOOSE FUEL CAP.

With a scan tool, select VIEW DTCs

Is the status Active for DTC P0455-EVAP SYSTEM LARGE LEAK along with this DTC?

Yes >> Perform the diagnostic procedure for P0455-EVAP SYSTEM LARGE LEAK.

No >> No repair necessary. Verify that the gas cap is in place and tight. Clear all DTCs and follow the directions outlined in the Owners Manual on resetting the odometer or message center display.