# P0456 on the 2019 Jeep Wrangler

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0456

- [11034358](https://open.wenmarpro.com/bulletins/11034358), 2026-07-02: Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*P0420 \- Catalyst System Efficiency Below Threshold Bank 1. ● P0430 \- Catalyst System Efficiency Below Threshold Bank 2.\*\* ● P0456 \- EVAP System Small Leak. Customers may also comment on one or more of the following: ● \*\*Vehicle fails emissions inspection testing.\*\* ● Pinging/detonation sound from the engine after warm up at 1000\-1500 RPM at low speed. \(EMEA and APAC Only\). ● The vehicle stalls at low speeds and/or coming to a stop This bulletin involves reprogramming the PCM with the latest available software.
- [10236933](https://open.wenmarpro.com/bulletins/10236933), 2023-05-30: wiTECH Small Leak Verification Test \(SLVT\) \- P0456\-EVAP SYSTEM SMALL LEAK
- [10229311](https://open.wenmarpro.com/bulletins/10229311), 2023-01-09: MIL Lamp On Setting DTC?s P0441, P0456, P0457, P0440
- [10224078](https://open.wenmarpro.com/bulletins/10224078), 2022-10-17: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. The customer may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find one or more ofthe following DTCs:P012A \- Turbocharger/Supercharger Inlet Pressure Sensor 1. P012C \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit Low. P012D \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit High. P0607 \- ECU Internal Performance. P06EF \- Engine Restart Performance. P050B \- Cold Start Ignition Timing Performance. P0456 \- EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P0128 \- Thermostat Rationality. P0507 \- Idle Speed Performance Higher Than Expected. Customers may also describe the following condition:Excessive radiator fan noise when the A/C is on MAX output. In addition, the following software enhancements are available:Electric Vacuum Pump \(EVP\) update. Fan noise reduction.
- [10223592](https://open.wenmarpro.com/bulletins/10223592), 2022-10-17: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P012A \- Turbocharger/Supercharger Inlet Pressure Sensor 1\(APAC, EMEA and LATAM Only\). P012C \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit Low\(APAC, EMEA and LATAM Only\). P012D \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit High\(APAC, EMEA and LATAM Only\). P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P06EF \- Engine Restart Performance. P04FC \- Crankcase Ventilation System Performance. P050B \- Cold Start Ignition Timing Performance. P0128 \- Thermostat Rationality. P0456 \- EVAP System Small Leak. If DTC P0456 is present, use the wiTECH Small Leak Verification Test \(SLVT\) to determine if there is a leak in the system. The following software enhancement is also available in this update:Enable soot retention for vehicles equipped with Gasoline Particulate Filter \(GPF\). Technicians may also experience the following:Unable to read data information from the OBD II connector when using a generic scan tool\(APAC Only\).
- [10221741](https://open.wenmarpro.com/bulletins/10221741), 2022-09-26: MIL Lamp On Setting DTC?s P0441, P0456, P0457, P0440
- [10221486](https://open.wenmarpro.com/bulletins/10221486), 2022-09-26: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. The customer may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find one or more of the following DTCs: P0335 \- Crankshaft Position Sensor Circuit. P0339 \- Crankshaft Position Sensor Intermittent. P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected. P061A \- Level 2 Torque Performance. P0607\-00 \- ECU Internal Performance. P2172 \- High Airflow/Vacuum Leak Detected \(Instantaneous Accumulation\). P02EE \- Cylinder 1 Injector Circuit Performance. P02EF \- Cylinder 2 Injector Circuit Performance. P02F0 \- Cylinder 3 Injector Circuit Performance. P02F1 \- Cylinder 4 Injector Circuit Performance. P012A \- Turbocharger/Supercharger Inlet Pressure Sensor 1. P012C \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit Low. P012D \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit High. P0607 \- ECU Internal Performance. P06EF \- Engine Restart Performance. P050B \- Cold Start Ignition Timing Performance. P0456 \- EVAP System Small Leak. If DTC P0456 is present use the wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P0128 \- Thermostat Rationality. P0507 \- Idle Speed Performance Higher Than Expected. Customers may also describe the following condition:Excessive radiator fan noise when the A/C is on MAX output. In addition, the following software enhancements are available: Electric Vacuum Pump \(EVP\) update. Fan noise reduction.
- [10221194](https://open.wenmarpro.com/bulletins/10221194), 2022-09-26: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P02EE \- Cylinder 1 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02EF \- Cylinder 2 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02F0 \- Cylinder 3 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02F1 \- Cylinder 4 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P012A \- Turbocharger/Supercharger Inlet Pressure Sensor 1\(APAC, EMEA and LATAM Only\). P012C \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit Low\(APAC, EMEA and LATAM Only\). P012D \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit High\(APAC, EMEA and LATAM Only\). P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P06EF \- Engine Restart Performance. P04FC \- Crankcase Ventilation System Performance. P050B \- Cold Start Ignition Timing Performance. P0128 \- Thermostat Rationality. P0456 \- EVAP System Small Leak. If DTC P0456 is present, use the wiTECH Small Leak Verification Test \(SLVT\) to determine if there is a leak in the system. The following software enhancement is also available in this update:Enable soot retention for vehicles equipped with Gasoline Particulate Filter \(GPF\). Technicians may also experience the following:Unable to read data information from the OBD II connector when using a generic scan tool\(APAC Only\).
- [10220071](https://open.wenmarpro.com/bulletins/10220071), 2022-09-15: wiTECH Small Leak Verification Test \(SLVT\) \- P0456\-EVAP SYSTEM SMALL LEAK
- [10194047](https://open.wenmarpro.com/bulletins/10194047), 2021-05-24: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P02EE \- Cylinder 1 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02EF \- Cylinder 2 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02F0 \- Cylinder 3 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P02F1 \- Cylinder 4 Injector Circuit Performance\(APAC, EMEA and LATAM Only\). P012A \- Turbocharger/Supercharger Inlet Pressure Sensor 1\(APAC, EMEA and LATAM Only\). P012C \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit Low\(APAC, EMEA and LATAM Only\). P012D \- Turbocharger/Supercharger Inlet Air Pressure Sensor 1 Circuit High\(APAC, EMEA and LATAM Only\). P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P06EF \- Engine Restart Performance. P04FC \- Crankcase Ventilation System Performance. P050B \- Cold Start Ignition Timing Performance. P0128 \- Thermostat Rationality. P0456 \- EVAP System Small Leak. If DTC P0456 is present, use the wiTECH Small Leak Verification Test \(SLVT\) to determine if there is a leak in the system. The following software enhancement is also available in this update:Enable soot retention for vehicles equipped with Gasoline Particulate Filter \(GPF\). Technicians may also experience the following:Unable to read data information from the OBD II connector when using a generic scan tool\(APAC Only\).