DTC Troubleshooting

Control System DTCs

DTC Troubleshooting: P0457

DTC P0457 : EVAP System Leak Detected/Fuel Fill Cap Loose or Missing

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How to Troubleshoot the Fuel And Emissions Systems.


1. Fuel fill cap installation check:

-1. Check the fuel fill cap (the cap must say TIGHTEN TO CLICK). It should turn 1/4 turn after it is tight, then it clicks.

Is the correct fuel fill cap installed and properly tightened?
-YES- Go to step 2.
-NO- Replace the fuel fill cap or tighten the cap, then do the repair verification.

2. Fuel fill cap seal and fuel fill pipe matching surface visual check:

-1. Check the fuel fill cap seal (A) and the fuel fill pipe matching surface (B). Verify that the fuel fill cap tether cord (C) is not caught under the cap.





Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap?
-YES- Replace the fuel fill cap or the fuel fill pipe, then do the repair verification.
-NO- The fuel fill cap and the fuel fill pipe are OK. Go to step 3.

3. Problem verification:

-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS. How to Troubleshoot the Fuel And Emissions Systems

-3. Select the EVAP TEST in the INSPECTION MENU, and do the FUNCTION TEST with the HDS.

Is the result OK?
-YES- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM.
-NO- The failure is duplicated. Go to step 4.

4. EVAP canister vent shut valve operation check:

-1. Clear the DTC with the HDS. How to Troubleshoot the Fuel And Emissions Systems

-2. Turn the ignition switch to LOCK (0).

-3. Remove the EVAP canister vent shut valve from the EVAP canister Service and Repair.

-4. Connect the 2P connector to the EVAP canister vent shut valve.

-5. Turn the ignition switch to ON (II).

-6. Select EVAP TEST in the INSPECTION MENU, and do the EVAP CVS ON in the SINGLE SOLENOID with the HDS.

-7. Check the EVAP canister vent shut valve (A) operation.





Does the valve operate?
-YES- The EVAP canister vent shut valve is OK. Go to step 5.
-NO- Replace the EVAP canister vent shut valve Service and Repair, then do the repair verification.

5. EVAP canister vent line check:

-1. Check the routing of the EVAP canister vent tube.

Is there any damage or blockage?
-YES- Remove the blockage and replace the EVAP canister vent tube if needed, then do the repair verification.
-NO- Do the DTC P0455 troubleshooting.

Repair verification:

-1. Turn the ignition switch to LOCK (0).

-2. Install the parts in the reverse order of removal.

-3. Turn the ignition switch to ON (II).

-4. Reset the PCM with the HDS How to Troubleshoot the Fuel And Emissions Systems.

-5. Do the PCM idle learn procedure PCM Idle Learn Procedure.

-6. Select the EVAP TEST in the INSPECTION MENU, and do the FUNCTION TEST with the HDS.

Is the result OK?
-YES- Troubleshooting is complete.
-NO- Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM, then go to step 1.