JKJA10

Just came on this morning plugged in my scan tool and this came up. Is anyone familiar with this? If so what can I do or does it have to seek a professional. All comments and advice are deeply appreciated.

P0455 $07E8 Generic
Evaporative Emission System
?
Leak Detected (large leak)

JKJA10

ouroborus2012

Did you get gas recently? I'm pretty sure P0455 pops up for a loose gas cap also. It hit me once and sure enough.... Loose gas cap! Worth a check!

JKJA10

yeah I'm checking that now. i put the original gas cap back on and disconnect ted the battery to reset code. since i got the jeep i installed the billet gas cap so who knows maybe might not be making a tight seal.

bevan7170

P0455-EVAP PURGE SYSTEM LARGE LEAK




For a complete wiring diagram Refer to Diagrams/Electrical .

When Monitored: With the engine running, during a cold start test with the fuel level above 12%, ambient temperature between 4°C and 32°C (39°F and 89°F) and the fuel system in closed loop. The test runs when the small leak test is maturing.
Set Condition: The PCM activates the EVAP Purge Solenoid to pull the EVAP system into a vacuum to close the ESM switch. Once the ESM switch is closed, the PCM turns the EVAP Purge solenoid off to seal the EVAP system. If the ESM switch reopens before the calibrated amount of time, a large leak error is detected. Two Trip Fault. Three good trips to turn off the MIL.



Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
Ignition on, engine not running.
With a scan tool, select View DTCs and record the related Freeze Frame data if any DTC(s) are present.
Whether or not any DTC(s) are Active you will want to check the following items which may assist in repairing the customer's complaint successfully.
Check the vehicle's repair history.
If the vehicle has a repair history that pertains to the customer's current complaint, review the repair.
Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
Check for any service bulletin(s) related to the customer's complaint or DTC(s).
If a service bulletin applies, follow the instructions per the service bulletin.
Choose the following scenario that best applies.

The service bulletin repaired the customer's complaint.

Testing complete.
A DTC is present, no service bulletins apply, or the service bulletin
didn't repair the customer's complaint.

Go To 2
2. ACTIVE DTC
NOTE: Since a hot vehicle can conceal a leak, it is best to perform this test at room temperature.

NOTE: A loose gas cap could have caused this DTC to set. Make sure gas cap is tight and in good condition. Make sure the gas cap meets OEM specifications.

Start the engine.
Allow the engine to idle.
Using the scan tool, perform the ESIM FORCED MONITOR TEST. Allow the test to complete.
With a scan tool, select View DTCs.
Is the DTC Active at this time?

Yes

Go To 3
No

Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Component Tests and General Diagnostics\Intermittent Condition
3. EVAPORATIVE SYSTEM INSPECTION
Perform a visual and physical inspection of the entire Evaporative Emission system.
Check for the following conditions:
- Holes or cracks
- Loose seal points
- Evidence of damaged components
- Incorrect routing of hoses and tubes
- Loose or missing Fuel Filler Cap
- Improper installation of the Fuel Fill Cap
- Damaged Locking tabs on Cap and/or fill tube
- Damaged seal points on Cap and/or fill tube
- Fuel cap gasket seal
Were any of the above conditions found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
No

Go To 4
4. VERIFY EVAPORATIVE EMISSION LEAK
WARNING: Keep lit cigarettes, sparks, flames, and other ignition sources away from the test area to prevent the ignition of explosive gases. Keep the test area well ventilated.

To continue testing you will need Miller Tool #8404A Evaporative Emission Leak Detector (EELD).

NOTE: The fuel tank should have between 20% and 80% of fuel tank capacity to properly test the Evap system.

Connect the red power lead of the EELD to the battery positive terminal and the black ground lead to battery negative terminal.
Block the vent hose of the canister if using the service port.
Connect shop air to the EELD.
Set the smoke/air control switch to AIR.
Insert the tester's AIR supply tip (clear hose) into the appropriate calibration orifice on the tester's control panel (based on DTC leak size).
Press the remote smoke/air start button.
Position the red flag on the air flow meter so it is aligned with the indicator ball.
When the calibration is complete, release the remote button. The EELD flow meter is now calibrated in liters per minute to the size leak indicated by the DTC set in the PCM.
Install the service port adapter #8404-14 on the vehicle's service port and block the vent hose of the EVAP Canister (if equipped) or install the #8404-ADP service adaptor into the filter line.
Connect the Air supply hose from the EELD to the service port (if equipped) or to the #8404-ADP adapter.
Press the remote button to activate AIR flow.

NOTE: Larger volume fuel tanks, lower fuel levels or if the vehicle is equipped with a Flow Management Valve may indicate high flow and will require 4 to 5 minutes to fill.

Compare the flow meter indicator ball reading to the red flag.
ABOVE the red flag indicates a leak present.
BELOW the red flag indicates a sealed system.
Is the indicator ball above the red flag?

Yes

Go To 5
No

Refer to the Freeze Frame data recorded in step 1. If the data indicates that the vehicle was in motion when the DTC was set, verify that all hoses are properly connected.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
5. EVAPORATIVE EMISSION LEAK DETECTION
NOTE: A thorough visual inspection of the Evap system hoses, tubes, and connections may save time in your diagnosis. Look for any physical damage or signs of wetness at connections. The strong smell of fuel vapors may aid diagnosis also.

To continue testing, you will need Miller Tool #8404A Evaporative Emissions Leak Detector (EELD).
Remove the Air supply hose from the service port (if equipped) or from the #8404-ADP adapter.
Connect the SMOKE supply tip (black hose) to the service port (if equipped) or to the #8404-ADP adapter.
Set the smoke/air control switch to SMOKE.

NOTE: The flow meter indicator ball will not move in the smoke mode.

Press the remote smoke/air start button.

NOTE: Make sure that smoke has filled the EVAP system by continuing to press the remote smoke/air start button, remove the vehicle fuel cap, and wait for the smoke to exit. Once smoke is indicated reinstall the fuel cap.

NOTE: For optimal performance, introduce smoke into the system for an additional 60 seconds; continue introducing smoke at 15 second intervals, as necessary.

While still holding the remote smoke/air start button, use the white light (#8404-CLL) to follow the EVAP system path, and look for the source of the leak indicated by exiting smoke.
If a leak is concealed from view (i.e., top of fuel tank), release the remote smoke/air start button, and use the ultraviolet (UV) black light #8404-UVL and the yellow goggles 8404-20 to look for residual traces of dye that is left behind by the smoke.
The exiting smoke deposits a residual fluid that is either bright green or bright yellow in color when viewed with a UV light.

NOTE: The EVAP System is divided into three zones. A leak from any of these zones can cause this DTC to set. The lists below specify the possible leak points in that specific zone. For further assistance see the Zone Identification Charts below.



ZONE 1
1 Fuel Cap.
2 Recirculation Check Valve.
3 Vapor Recirculation Line.
4 Signal Vapor Line for FVM.
5 Flow Management Valve.
6 Fuel Tank to Canister Vapor Line connection.
7 Fuel Tank Vent (Check Valve).
8 Vapor Line to Canister.
9 Flow Control Orifice.
10 Control Valve.
11 Liquid Trap.
12 Fuel Tank.
13 Check valve.
14 Fuel Fill Tube to Tank connector.
15 Fuel Fill Tube.
Damaged or disconnected EVAP system components.



ZONE 2
1 Filter.
2 ESM.
3 Canister Vent Line.
4 Evap Canister.
5 Chassis Purge Valve.
6 Fuel Tank to Canister Vapor Line connection.
7 Evap Purge connection.



ZONE 3
1 Evap Purge Vacuum Line.
2 Connection to Chassis Line.
3 Connection to Canister.
4 Chassis Purge Line.
5 Evap Purge Vacuum Line.
6 Connection to Evap Purge Harness.
7 Chassis Evap Purge Line connection to Engine Vacuum.
8 Evap Purge Valve.
9 Service Port.

NOTE: Carefully inspect the vent side of the EVAP Canister. Due to the filtering system in the canister the smoke may not be as thick. Introducing smoke into the filtered side of the canister may assist in locating the leak.

Select the appropriate response from the list below:

A leak was found at the gas cap or fuel filler tube

Go To 6
A leak was found in one or more of the EVAP System zones

If the leak is at a hose connection, remove the hose then reconnect the hose and check for a leak again. All other leaks repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
No leaks were detected

Go To 7
6. LEAK AT GAS CAP
Remove the SMOKE supply tip (black hose) from the service port (if equipped) or to the #8404-ADP adapter.
Install gas cap adapter, Miller Tool #8382 (1/4 turn cap) or #6922 (screw cap) and #8399* (secondary seal depressor) and repeat test 5.

NOTE: The gas cap adapter is being used as a known good cap.

Was a leak found at the gas cap adapter?

Yes

Replace the Fuel Filler tube assembly.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
No

Replace the gas cap.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
7. EVAP PURGE SOLENOID OPERATION
NOTE: After disconnecting the Evap Purge Solenoid vacuum connections, inspect the lines and solenoid for any signs of contamination from the EVAP Canister.

Turn the ignition off.
Disconnect the Evap Purge Solenoid Vacuum hose at the Throttle Body.

NOTE: You are disconnecting the vacuum line at the Throttle Body so you are not disturbing the vacuum connection at the Evap Purge Solenoid.

Press the remote smoke/air start button on the EELD.
While holding the remote smoke/air start button, check to see if smoke is exiting the Evap Purge Solenoid Vacuum hose at the Throttle Body. This indicates that there is a leak internal to the purge valve.

NOTE: Below is an optional method of checking the purge valve for leaks if the EELD is unavailable.

Turn the ignition off.
Disconnect the vacuum hoses at the Evap Purge Solenoid.
Using a hand vacuum pump, apply 10 in HG to the "CAN" of the Evap Purge Solenoid.

NOTE: Monitor the vacuum gauge for at least 15 seconds.

Is smoke visible from the EVAP Purge Solenoid Vacuum hose if using
the EELD, or will it not hold a vacuum?

Yes

Replace the Evap Purge Solenoid.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
No

Go To 8
8. EVAP SYSTEM MONITOR SWITCH
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Evap System Monitor Switch and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Verify that there is good pin to terminal contact in the Switch and the Powertrain Control Module connectors.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test
No

Replace the ESIM Switch Assembly.
Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test

JKJA10

Wow, bevan7170 thanks for all that info and ouroborus2012 for your info. So far it might have been the gas cap since i bought my jeep 2010 i installed the Billet Aluminum locking fuel cap I guess its no longer making a tight seal put the original gas cap back on, disconnected the battery for 30mins, reconnected battery turned ignition on for 10mins and presto magic no more codes. Thanks again guys.

ouroborus2012

Good to hear, brotha! Gotta love cheap fixes!