{"vehicle":{"id":"2019_jeep_wrangler","year":2019,"make":"Jeep","model":"Wrangler"},"code":"P0456","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":26,"bulletins":[{"nhtsa_id":11034358,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-07-02","date":"2026-06-25","document_id":"18-062-26","mfr_campaign":null,"component":"ENGINE; POWER TRAIN","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034358-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034358-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11034358"},{"nhtsa_id":10236933,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-05-30","date":"2023-04-15","document_id":"1804823","mfr_campaign":null,"component":"EQUIPMENT; ENGINE AND ENGINE COOLING","summary":"wiTECH Small Leak Verification Test (SLVT) - P0456-EVAP SYSTEM SMALL LEAK","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10236933-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10236933-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10236933"},{"nhtsa_id":10229311,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-01-09","date":"2020-07-31","document_id":"S2008000112","mfr_campaign":null,"component":"BACK OVER PREVENTION:DISPLAY FUNCTION; STRUCTURE:INTERIOR PANELS:DASHBOARD","summary":"MIL Lamp On Setting DTC?s P0441, P0456, P0457, P0440","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10229311-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10229311-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10229311"},{"nhtsa_id":10224078,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-17","date":"2020-11-07","document_id":"1802220","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10224078-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10224078-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10224078"},{"nhtsa_id":10223592,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-17","date":"2020-06-20","document_id":"1802120","mfr_campaign":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)","summary":"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).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10223592-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10223592-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10223592"},{"nhtsa_id":10221741,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-09-26","date":"2020-07-31","document_id":"S2008000112","mfr_campaign":null,"component":"ELECTRICAL SYSTEM","summary":"MIL Lamp On Setting DTC?s P0441, P0456, P0457, P0440","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10221741-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10221741-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10221741"},{"nhtsa_id":10221486,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-09-26","date":"2022-06-14","document_id":"1811422","mfr_campaign":null,"component":"POWER TRAIN; ELECTRICAL SYSTEM","summary":"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10221486-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10221486-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10221486"},{"nhtsa_id":10221194,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-09-26","date":"2021-04-15","document_id":"1803721","mfr_campaign":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; ELECTRICAL SYSTEM","summary":"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).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10221194-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10221194-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10221194"},{"nhtsa_id":10220071,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-09-15","date":"2019-11-01","document_id":"1808919","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING","summary":"wiTECH Small Leak Verification Test (SLVT) - P0456-EVAP SYSTEM SMALL LEAK","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10220071-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10220071-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10220071"},{"nhtsa_id":10194047,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-05-24","date":"2021-04-15","document_id":"18-037-21","mfr_campaign":null,"component":"EXTERIOR LIGHTING; BACK OVER PREVENTION; FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM; SERVICE BRAKES","summary":"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).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10194047-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10194047-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10194047"}],"url":"https://open.wenmarpro.com/makes/jeep/wrangler/2019/bulletins?code=P0456"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/jeep/wrangler/2019/codes/P0456","note":"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.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}