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 vent solenoid valve and the 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, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0220, P0222, P0223, P0442, P0443, P0449, P0451, P0452, P0453, P0454, P0464, P0496, P0606, P0608, P0609, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176, P2227, P2228, P2229 are not set.
* The ignition voltage is between 11-32 V.
* The barometric pressure (BARO) is greater than 70 kPa.
* The fuel level is between 10-90 %.
* The cold startup engine coolant temperature (ECT) and the startup intake air temperature (IAT) are equal to or less than 8°C (46°F).
* The startup engine coolant temperature (ECT) is less than 35°C (95°F).
* The startup intake air temperature (IAT) is between 4-30°C (39-86°F).
* DTC P0455 runs once per cold start, for up to 17 min, 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.
* After setting the DTC for the first time, 2 L (0.5 gal) of fuel must be consumed before setting the DTC for the second time.
* With a DTC P0455 detected a weak vacuum follow-up test (fuel cap replacement test) will run and passes if tank vacuum is greater than 2.74 kPa (11 in H20). This test will run for a maximum of 21 min. This test runs until it passes.
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 EN 41413-VLV - EVAP Service Port Vent Fitting at the service port to allow the system to fill faster.
* To help locate intermittent leaks using the GE 41413-A - Evaporative Emissions System Tester (EEST), move all EVAP components while observing smoke with the J 41413-SPT - High Intensity White Light.
* Individual components can be isolated and tested using adapters in the J 41413-300 - EVAP Cap and Plug Kit.
* 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 [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
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
* J 41415-30 - Fuel Tank Cap Adapter
* GE 41413-A - Evaporative Emissions System Tester (EEST)
* J 41413-300 - EVAP Cap and Plug Kit
* J 41413-311 - EVAP Plug
* J 41413-SPT - High Intensity White Light
* J 41413-VLV - EVAP Service Port Vent Fitting
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Testing
Note:
* Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize or produce smoke from a leak.
* Refer to the GE 41413-A - Evaporative Emissions System Tester (EEST) 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 Q12 Evaporative Emission Canister Purge Solenoid valve. Install the CH 48096 - EVAP Service Access Port Tool between the disconnected purge tube and the purge solenoid valve. Connect the GE 41413-A - Evaporative Emissions System Tester (EEST) to the EVAP Service Access Port Tool.
2. Use a scan tool to seal the EVAP system and use the flow meter on the GE 41413-A - Evaporative Emissions System Tester (EEST), calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.
• If a leak is detected, use the GE 41413-A - Evaporative Emissions System Tester (EEST) to apply smoke to the EVAP system at the service port or purge tube until the leak is located using the J 41413-SPT - High Intensity White Light.
3. To test for a restriction, connect the GE 41413-A - Evaporative Emissions System Tester (EEST) nitrogen/smoke hose to the to the J 41413-311 - EVAP Plug brass cone adapter. Disconnect the hose at the fuel cap end of the J 41415-30 - Fuel Tank Cap Adapter. Connect the J 41413-311 - EVAP Plug to the disconnected hose on the J 41415-30 - Fuel Tank Cap Adapter. Install the J 41415-30 - Fuel Tank Cap Adapter, filler neck end only, to the vehicle.
4. Engine idling, command the Purge/Seal function to seal the system with a scan tool.
5. Command the EVAP Purge Solenoid Valve to 30 %.
6. The vacuum/pressure gauge on the GE 41413-A - Evaporative Emissions System Tester (EEST) and the FTP parameter on the scan tool should both show vacuum.
• If the vacuum/pressure gauge shows vacuum, but the FTP parameter does not show vacuum, replace the B150 Fuel Tank Pressure 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 or more than 3.2 V, and the values are similar between the scan tool and the vacuum/pressure gauge on the GE 41413-A - Evaporative Emissions System Tester (EEST).
• If the values are not similar, or the voltage did not reach 3.2 V, replace the B150 Fuel Tank Pressure Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Fuel Tank Pressure Sensor Replacement Service and Repair