P0421 · 原廠技術資料

CHEVROLET, GMC · 2023-08-10

This technical bulletin provides repair information to correct a customer concern of Service Engine Soon Lamp being illuminated. They may also comment on multiple transmission issues including harsh or delayed shifts, slip, surge, shudder, noise, whine, growl, shake and/or vibration. As well as the exhaust brake not working or that they do not feel it. Technicians may find DTCs P2002, P2463, P2459, P144E, P0421, P0422, P0106 P20EE, P129F, P16F3, P20FF, P226D, P249D, P249E, P11CC and / or P11D5.

RAM · 2022-07-20

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs: P20EE - SCR NOx Catalyst Efficiency Below Threshold - Bank 1. P1C54 - SCR NOx Catalyst Missing. P229F - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 2. P207F - Reductant Quality Performance. P2002 - Diesel Particulate Filter Efficiency Below Threshold. P2201 - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 1. P202E - (Diesel Exhaust Fluid) Reductant Injector Performance. P0300 - Multiple Cylinder Misfire. P0301-00 -…

RAM · 2022-07-20

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs: P20EE - SCR NOx Catalyst Efficiency Below Threshold - Bank 1. P1C54 - SCR NOx Catalyst Missing. P229F - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 2. P207F - Reductant Quality Performance. P2002 - Diesel Particulate Filter Efficiency Below Threshold. P2201 - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 1. P202E - (Diesel Exhaust Fluid) Reductant Injector Performance. P0300 - Multiple Cylinder Misfire. P0301-00 -…

CHEVROLET, GMC · 2022-04-01

This technical bulletin provides repair information to correct a customer concern of Service Engine Soon Lamp being illuminated with DTCs P2002, P2463, P2459, P144E, P0421, P0422, P0106 P20EE, P129F, P16F3, P20FF, P226D, P249D, P249E, P11CC and / or P11D5. They may also comment on multiple transmission issues including harsh or delayed shifts, slip, surge, shudder, noise, whine, growl, shake and/or vibration.

CHEVROLET, GMC · 2022-02-16

This technical bulletin provides repair information to correct a customer concern of Service Engine Soon Lamp being illuminated. They may also comment on multiple transmission issues including harsh or delayed shifts, slip, surge, shudder, noise, whine, growl, shake and/or vibration. As well as the exhaust brake not working or that they do not feel it. Technicians may find DTCs P2002, P2463, P2459, P144E, P0421, P0422, P0106 P20EE, P129F, P16F3, P20FF, P226D, P249D, P249E, P11CC and / or P11D5.

CHEVROLET, GMC · 2022-01-27

This technical bulletin provides repair information to correct a customer concern of Service Engine Soon Lamp Illuminated, Harsh or Delayed Transmission Shifts Including Slip, Surge, Shudder, Noise, Whine, Growl, Shake and/or Vibration, DTCs P2002, P2463, P2459, P144E, P0421, P0422, P0106 and/or P20EE Set Current or in Recent History.

RAM · 2021-02-24

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs.P20EE - SCR NOx Catalyst Efficiency Below Threshold - Bank 1. P1C54 - SCR NOx Catalyst Missing. P229F - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 2. P207F - Reductant Quality Performance. P2002 - Diesel Particulate Filter Efficiency Below Threshold. P2201 - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 1. P202E - (Diesel Exhaust Fluid) Reductant Injector Performance. P0300 - Multiple Cylinder Misfire. P0301-00 -…

RAM · 2021-02-24

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs.P20EE - SCR NOx Catalyst Efficiency Below Threshold - Bank 1. P1C54 - SCR NOx Catalyst Missing. P229F - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 2. P207F - Reductant Quality Performance. P2002 - Diesel Particulate Filter Efficiency Below Threshold. P2201 - Aftertreatment NOx Sensor Circuit Performance - Bank 1 Sensor 1. P202E - (Diesel Exhaust Fluid) Reductant Injector Performance. P0300 - Multiple Cylinder Misfire. P0301-00 -…

RAM · 2020-08-07

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (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 Diagnostic Trouble Codes (DTCs) have been set:P2463-00 - Diesel Particulate Filter Restriction - Soot Accumulation Bank 1. P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation. P1D73-00 - AGS Performance. P0299-00 - Turbocharger Underboost(Additional Improvement for D2 ETM Only). P1451-00 - Diesel Particulate Filter System Performance. P0421-00 - Catalyst 1 Efficiency Below Threshold Bank 1. P24A5-00 - EGR Cooler Bypass Bank 1 Control…

RAM · 2020-08-07

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (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 Diagnostic Trouble Codes (DTCs) have been set:P2463-00 - Diesel Particulate Filter Restriction - Soot Accumulation Bank 1. P242F-00 - Diesel Particulate Filter Restriction - Ash Accumulation. P1D73-00 - AGS Performance. P0299-00 - Turbocharger Underboost(Additional Improvement for D2 ETM Only). P1451-00 - Diesel Particulate Filter System Performance. P0421-00 - Catalyst 1 Efficiency Below Threshold Bank 1. P24A5-00 - EGR Cooler Bypass Bank 1 Control…

HINO · 2020-03-19

SB-20-001 If a truck comes to the dealer with a MIL lamp illuminated with the Diagnostic Trouble Code (DTC): P0421 –Determination of ATC Deterioration. Certain 16MY-20MYCab-Over Engine (COE) Trucks equipped with a J05 engine or Conventional Trucks equipped with a J08 engine.

RAM · 2019-10-22

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/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 Diagnostic Trouble Codes (DTCs) have been set: P0421-00 - Catalyst 1 Efficiency Below Threshold Bank 1. P1451-00 - Diesel Particulate Filter System Performance. P24A5-00 - EGR Cooler Bypass Bank 1 Control Stuck. P21C4-00 - Reductant Line Heater Relay Control Circuit High. P1D73-00 - AGS Performance. P2560-00 - Engine Coolant Level Low. P2201-00 - Aftertreatment NOX Sensor Circuit Performance - Bank 1 Sensor 1. P0604-00 - Internal Control Module Ram.…

CHEVROLET, GMC · 2018-06-19

18209 - Service Update. Certain vehicles equipped with a 1.6L diesel engine (RPO LH7), may have been built with an improper alignment of the clamp/gasket assembly connecting the turbocharger to the catalytic converter. This condition may cause a diesel exhaust leak and/or smoke from the underhood area of the vehicle. In addition, a check engine indicator may set with diagnostic trouble code P0421. Dealers are to inspect and replace the turbocharger to catalytic converter clamp/gasket as necessary.

CHEVROLET, GMC · 2018-04-18

This technical bulletin provides a procedure to reposition the exhaust clamp to correct a condition of Exhaust Smell in Cabin and/or DTC P0421 Set due to a miss installed clamp.

RAM · 2017-10-25

Flash: 6.7L Diagnostic and System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The following Diagnostic Trouble Codes (DTCs) have been changed from a one trip fault to a two trip fault:P0421 - Catalyst 1 Efficiency Below Threshold Bank 1. P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following DTCs set in the PCM memory:P218F - Reductant No Flow Detected. P202E - (Diesel Exhaust Fluid)…

CHEVROLET · 2017-10-04

This engineering informational bulletin is requesting information from the field on vehicles that have the condition of Malfunction Indicator Lamp Illuminated and DTC P0421 Set.

CHEVROLET · 2017-10-01

Engineering Information – Malfunction Indicator Lamp Illuminated and DTC P0421 Set

RAM · 2017-03-10

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The following Diagnostic Trouble Codes (DTCs) have been changed from a one trip fault to a two trip fault: P0421 - Catalyst 1 Efficiency Below Threshold Bank 1. P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High.A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following DTCs set in the PCM memory: P1451 - Diesel Particulate Filter System Performance. P229E - NOx Sensor…

RAM · 2016-06-02

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The following Diagnostic Trouble Codes (DTCs) have been changed from a one trip fault to a two trip fault: · P0421 - Catalyst 1 Efficiency Below Threshold Bank 1. · P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. · P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. · P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following DTCs set in the PCM memory: · P0128 - Thermostat Rationality Improvements. · P2281 - Air Leak…

RAM · 2016-06-02

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The following Diagnostic Trouble Codes (DTCs) have been changed from a one trip fault to a two trip fault: · P0421 - Catalyst 1 Efficiency Below Threshold Bank 1. · P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. · P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. · P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following DTCs set in the PCM memory: · P0128 - Thermostat Rationality Improvements. · P2281 - Air Leak…

RAM · 2016-05-21

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The following DTCs have been changed from a one trip fault to a two trip fault: · P0421 - Catalyst 1 Efficiency Below Threshold Bank 1. · P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. · P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. · P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following DTCs set in the PCM memory: · **P0128 - Thermostat Rationality Improvements.** · P2281 - Air Leak Between MAF and…

RAM · 2016-05-21

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. The following DTCs have been changed from a one trip fault to a two trip fault: · P0421 - Catalyst 1 Efficiency Below Threshold Bank 1. · P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. · P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. · P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following DTCs set in the PCM memory: · **P0128 - Thermostat Rationality Improvements.** · P2281 - Air Leak Between MAF and…

RAM · 2016-04-08

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. DTCs have been changed from a one trip fault to a two trip fault: · **P0421 - Catalyst 1 Efficiency Below Threshold Bank 1.** · P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. · P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. · P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following Diagnostic Trouble Codes (DTCs) set in the PCM memory: · P2281 - Air Leak Between MAF and Throttle Body. · P218F - Reductant No…

RAM · 2016-04-08

Flash: 6.7L Diagnostic And System Improvements This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. DTCs have been changed from a one trip fault to a two trip fault: · **P0421 - Catalyst 1 Efficiency Below Threshold Bank 1.** · P2280 - Air Flow Restriction / Leak Between Air Cleaner And MAF. · P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low. · P208D - (Diesel Exhaust Fluid) Reductant Pump Control Circuit High. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following Diagnostic Trouble Codes (DTCs) set in the PCM memory: · P2281 - Air Leak Between MAF and Throttle Body. · P218F - Reductant No…

MAZDA · 2016-04-07

SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0421:00 (CATALYTIC CONVERTER SYSTEM) WITH-OUT EXPERIENCING POOR ENGINE PERFORMANCE OR MISFIRE (MITSUBISHI PCM ONLY).THIS IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM THAT MAY DETECT FALSE ERROR OF THE A/F SENSOR, RESULTING IN FALSE DETECTION OF P0421. TO CORRECT THE PROBLEM, THE CONTROL LOGIC OF THE PCM HAS BEEN CHANGED.CATALYST MON-ITOR FUNCTION EXPLANATION•THE PCM MONITORS THE OXYGEN STORAGE AMOUNT PROPORTIONAL TO CATALYTIC CONVERTER PURIFICATION CHARACTERISTIC.•THE PCM STARTS TO MONITOR AFTER RECOVERY (FUEL INJECTION STARTS) FROM FUEL CUT CONTROL.•THE PCM TEMPORARILY CHANGES THE TARGET AIR/FUEL RATIO TO RICH AT FUEL CUT RECOVERY, AND DETECTS THE RESPONSE TIME UNTIL THE HO2S OUTPUT SIGNAL OUTPUTS THE VOLTAGE ON THE RICH…

MAZDA · 2015-08-04

SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT ON WITH DTC P0421:00 (CATALYTIC CONVERTER SYSTEM) WITHOUT EXPERIENCING POOR ENGINE PERFORMANCE OR MISFIRE (MITSUBISHI PCM ONLY). THIS IS CAUSED BY IMPROPER CONTROL LOGIC OF THE PCM THAT MAY DETECT FALSE ERROR OF THE A/F SENSOR, RESULTING IN FALSE DETECTION OF P0421. TO CORRECT THE PROBLEM, THE CONTROL LOGIC OF THE PCM HAS BEEN CHANGED. CATALYST MONITOR FUNCTION EXPLANATION • THE PCM MONITORS THE OXYGEN STORAGE AMOUNT PROPORTIONAL TO CATALYTIC CONVERTER PURIFICATION CHARACTERISTIC. • THE PCM STARTS TO MONITOR AFTER RECOVERY (FUEL INJECTION STARTS) FROM FUEL CUT CONTROL. • THE PCM TEMPORARILY CHANGES THE TARGET AIR/FUEL RATIO TO RICH AT FUEL CUT RECOVERY, AND DETECTS THE RESPONSE TIME UNTIL THE HO2S OUTPUT SIGNAL OUTPUTS THE VOLTAGE ON THE…

HINO · 2015-07-01

ECU False P0421 DTC Detection. A subject vehicle may exhibit an illuminated MIL (Malfunction Indicator Lamp) with DTC (Diagnostic Trouble Code) P0421 (ATC Dtc Deterioration Monitoring). The engine ECU may falsely detect an issue with the ATC ( After Turbo Catalyst). Enhanced ECU software is available.

HINO · 2015-07-01

AA0H0 A subject vehicle may exhibit an illuminated MIL (Malfunction Indicator Lamp) with DTC (Diagnostic Trouble Code) P0421 (ATC Deterioration Monitoring). The engine ECU may falsely detect an issue with the ATC (After Turbo Catalyst). Enhanced ECU software is available.

HINO · 2015-01-09

SB-15-003 CORRECTION OF WORKSHOP MANUAL FOR HINO 2015MY (REVISION OF TROUBLESHOOTING PROCEDURE FOR THE DTC P0421)

HINO · 2014-07-15

A subject vehicle may exhibit an illuminated check engine lamp with DTC (Diagnostic Trouble Code) P0421 (Catalyst efficiency below threshold). The engine ECU may falsely detect an issue with the ATC (After Turbo Catalyst) with the current ECU software. If DTC P0421 is stored in the engine ECU, reprogram the ECU to the latest software level prior to suspecting a fault with the ATC.