P0455
DTC P0455
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0455
- Evaporative Emission (EVAP) System Large Leak Detected
Circuit/System Description
The ECM tests the Evaporative Emission (EVAP) System for a large leak or restrictions to the purge path in the EVAP system. When the enabling criteria has been met the ECM commands the EVAP canister vent solenoid valve OFF and the EVAP canister purge solenoid valve ON, allowing vacuum into the EVAP system. The ECM monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.
Conditions for Running the DTC
* DTCs P0068, P0606, P0106, P0107, P0108, P0112, P0133, P0116, P0117, P0118, P0120, P0122, P0123, P0125, P0220, P0222, P0443, P0449, P0452, P0453, P0454, P0502, P0503, P0722, P0723, P2227, P2227, P2229 are not set.
* The ignition voltage is between 11-32 volts.
* The barometric pressure (BARO) is more than 70 kPa.
* The fuel level is between 10-90 percent.
* The engine coolant temperature (ECT) is less than 35°C (95°F).
* The intake air temperature (IAT) is between 4-30°C (39-86°F).
* DTC P0455 runs once per cold start when the above conditions are met.
Conditions for Setting the DTC
The EVAP system is not able to achieve or maintain a calibrated level of vacuum within a set amount of time.
Action Taken When the DTC Sets
DTC P0455 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0455 is a Type B DTC.
Diagnostic Aids
* Inspect for a loose, missing, damaged, or incorrect fuel fill cap.
* Inspect for a damaged fuel filler neck seal surface.
* A blockage or restriction in the EVAP purge solenoid valve, purge pipe, EVAP canister, or vapor pipe, can cause this DTC to set.
* The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. For example, when injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until smoke is observed, then close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV at the service port to allow the system to fill faster.
* To help locate intermittent leaks using the J 41413-200 , move all EVAP components while observing smoke with the GE-41413-SPT .
* Individual components can be isolated and tested using adapters in the J 41413-300 .
* A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the EVAP system and then observe the FTP parameter for vacuum decay.
Reference Information
Schematic Reference
Engine Controls Schematics (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Evaporative Emission Control System Description Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
* CH-48096 EVAP Service Access Port Tool
* GE-41415-50 Fuel Tank Cap Adapter
* J 41413-200 Evaporative Emissions System Tester (EEST)
* J 41413-300 EVAP Cap and Plug Kit
* J-41413-311 EVAP Plug
* GE-41413-SPT High Intensity White Light
* J 41413-VLV EVAP Service Port Vent Fitting
Circuit/System Testing
Important:
* Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
* Refer to the J 41413-200 operation manual for detailed instructions in Evaporative Emission System Diagnosis Evaporative Emission System Diagnosis.
1. Disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096 service port adapter tool. Connect the J 41413-200 to the vehicle EVAP service port adapter.
2. Seal the system with a scan tool and use the flow meter on the J 41413-200 , calibrated to 0.51 millimeter (0.020 inch) to determine that there is no leak in the EVAP system.
• If a leak is detected, use the J 41413-200 to apply smoke to the EVAP system at the service port or the purge tube until the leak is located using the GE-41413-SPT .
3. Connect the J 41413-200 nitrogen/smoke hose to the J-41413-311 brass cone adapter. Disconnect the hose at the fuel cap end of the GE-41415-50 . Connect the J-41413-311 to the disconnected hose on the GE-41415-50 . Install the GE-41415-50 filler neck end only to the vehicle.
4. Engine idling, command Purge/Seal function to seal the system with a scan tool.
5. Command the EVAP canister purge solenoid valve to 30 percent.
6. The vacuum/pressure gauge on the J 41413-200 and the FTP parameter on the scan tool should display vacuum.
• If the vacuum/pressure gauge shows vacuum, but the FTP parameter does not show vacuum, replace the FTP sensor.
• If neither the FTP parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
7. Verify that the vacuum increases to the abort limit on the scan tool, greater than 3.2 volts, and the values are similar between the scan tool and the vacuum/pressure gauge on the J 41413-200 .
• If the values are not similar, or the voltage did not reach 3.2 volts, replace the FTP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
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