DTC Troubleshooting: P0457
DTC P0457: EVAP System Leak Detected/Fuel Fill Cap Loose or Missing
The fuel system is designed to allow specified maximum vacuum and pressure conditions. Do not deviate from the vacuum and pressure tests as indicated in these procedures. Excessive pressure/vacuum would damage the EVAP components or cause eventual fuel tank failure.

NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
Fresh fuel has a higher volatility that will create greater pressure/vacuum. The best condition for testing is less than a full tank of fresh fuel. If possible, to assist in leak detection, add 1 gallon of fresh fuel to the tank (as long as it will not fill the tank), just before starting these procedures.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0457 EVAP System Leak Detected/Fuel Fill Cap Loose or Missing
     

1.
Fuel fill cap installation check:

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's 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 the fuel fill pipe, then do the repair verification.
2.
Fuel fill cap seal and fuel fill pipe mating surface check:

Fuel fill cap seal and fuel fill pipe mating surface check
?1.
Check the fuel fill cap seal (A) and the fuel fill pipe mating 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:

Problem verification
?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Select the EVAP TEST in the INSPECTION MENU, then select 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 purge valve, the EVAP canister vent shut valve, and the PCM. If the vehicle returns with the same DTC, continue with step 4.
     
NO
     
     
     
The failure is duplicated. Go to step 4.
4.
EVAP canister vent shut valve operation check:

EVAP canister vent shut valve operation check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Remove the EVAP canister vent shut valve from the EVAP canister.

?3.
Connect the 2P connector to the EVAP canister vent shut valve.

?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?5.
Select the EVAP CVS ON in the MULTI SOLENOIDS with the HDS, and check the EVAP canister vent shut valve (A) operation.

  

Does the valve operate?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Replace the EVAP canister vent shut valve, then do the repair verification.
5.
EVAP canister vent tube routing check:

EVAP canister vent tube routing check
?1.
Check the routing of the EVAP canister vent tube.

Is there any damage or blockage?

     
YES
     
     
     
Remove the blockage or replace the EVAP canister vent tube if needed, then do the repair verification.
     
NO
     
     
     
Go to the DTC P0455 troubleshooting, then do the repair verification.
Repair verification:

?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

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

?3.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.
Reset the PCM with the HDS.


?5.
Do the PCM idle learn procedure.

?6.
Select the EVAP TEST in the INSPECTION MENU, then select 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 purge valve, the EVAP canister vent shut valve, and the PCM, then go to step 1.