P0420 · Herstellerinformationen

FORD · 2025-07-25

Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0128, P0420, and/or P0430 stored in the powertrain control module (PCM). This may be due to the software in the PCM.

LEXUS · 2025-07-23

Some 2024 model year NX 350 vehicles equipped with a T24A-FTS engine may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P042000 (Catalyst System Efficiency Below Threshold Bank 1) present. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition.

RAM · 2025-07-04

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. ● P06EF - Engine Restart Performance. ● P0175 - Fuel System 2/1 Rich. ● P258B - Electronic Vacuum Pump Performance. ● P0128 - Thermostat Rationality. ● C0062 - Longitudinal Acceleration Sensor. In addition, the customer may experience one or more of the following: ● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness. ● Engine RPM erratic and or bucking, when accelerating after slowing down. ●…

FORD · 2025-06-26

Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to the software in the PCM.

DODGE · 2025-06-25

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.** ● P0441 - EVAP Purge System Performance (for North America and Mexico markets only). ● P0456 - EVAP System Small Leak. NOTE: If DTC P0456 is present, use the wiTECH Small Leak Verification Test (SLVT) to determine if a leak is present in the system. In addition, the customer may experience the following: ● **Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.** This bulletin involves reprogramming the PCM with the…

DODGE · 2025-06-25

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.** Customers may experience the following: ● Actual fuel economy reporting may not match the Instrument Panel Cluster (IPC). Other software improvements: ● Calibration update to address EVAP system emissions monitor readiness status accuracy. This bulletin involves reprogramming the PCM with the latest available software.

RAM · 2025-06-25

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. ● P06EF - Engine Restart Performance. ● P0175 - Fuel System 2/1 Rich. ● P258B - Electronic Vacuum Pump Performance. ● P0128 - Thermostat Rationality. ● C0062 - Longitudinal Acceleration Sensor. In addition, the customer may experience one or more of the following: ● **Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.** ● Engine RPM erratic and or bucking, when accelerating after slowing…

JEEP · 2025-06-25

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.** ● P0441 - EVAP Purge System Performance (for North America and Mexico markets only). ● P0456 - EVAP System Small Leak. NOTE: If DTC P0456 is present, use the wiTECH Small Leak Verification Test (SLVT) to determine if a leak is present in the system. **In addition, the customer may experience the following: ● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.** This bulletin involves reprogramming the PCM with the latest…

JEEP · 2025-06-25

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.** **In addition, the customer may experience one or more of the following: ● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.** ● Actual fuel economy reporting may not match the Instrument Panel Cluster (IPC). Other software enhancements: ● Calibration update to address EVAP system emissions monitor readiness status accuracy This bulletin involves reprogramming the PCM with the latest available software.

FORD · 2025-06-14

Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0420 stored in the powertrain control module (PCM). This may be due to the software in the PCM.

FORD · 2025-05-30

This article supersedes TSB 24-2124 to change the labor operation from actual time to fixed time. Some of the vehicles listed in the Model statement above may exhibit an illuminated MIL with diagnostic trouble codes (DTCs) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to calibration and controls sensitivity.

FORD · 2025-05-08

Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0420 stored in the powertrain control module (PCM). This may be due to the software in the PCM.

SUBARU · 2025-04-08

This bulletin announces the diagnostic procedures and availability of reprograming files to rectify the following Diagnostic Trouble Codes (DTCs). The ELCM may accumulate condensation causing the inaccurate detection of P2404. P0420 may become falsely detected due to unstable combustion caused by a downshift. The new reprogramming files contains enhanced software allowing for condensation conditions and downshift rotational speeds be more accurately detected by the Engine Control Module (ECM).

RAM · 2025-03-27

"Flash: Ignition System Control Module (ISCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle mustexhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0305-00 - Cylinder 5 Misfire. ● P0306-00 - Cylinder 6 Misfire. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine misfires. ● Damage to catalyst. This bulletin involves inspecting and possibly reprogramming the ISCM and the Powertrain Control Module (PCM) with the latest available software."

FORD · 2025-03-26

Some of the vehicles listed in the Model statement above may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to the software in the PCM.

HONDA · 2025-03-08

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catalyst System Effciency Below Threshold] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.

FORD · 2025-03-08

Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P008A and/or P0420 stored in the powertrain control module (PCM) and no other driveability symptoms present. This may be due to the software level of the PCM.

JEEP · 2025-03-08

"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. ● P0017 - Crankshaft/camshaft Timing Misalignment - Bank 1 Sensor 2. ● P000A - Bank 1 Camshaft 1 Position Slow Response. ● P219A - Bank 1 Air-fuel Ratio Imbalance. Customers may also experience the following: ● A no crank/no start condition. In addition, the following software enhancement is available: ● Smart Charge change: Battery life improvements This bulletin involves possibly replacing the Oil control valves (OCV)s, and/or the Catalytic Converter and also reprogramming the PCM with the latest available…

RAM · 2025-03-05

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

JEEP · 2025-03-05

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

SUBARU · 2025-03-04

"This bulletin announces the diagnostic procedures and availability of reprograming files to rectify the following Diagnostic Trouble Codes (DTCs). • P2404: EVAP System Leak Detection Pump Sense Circuit Range/Performance. • P0420: Catalyst System Efficiency Below Threshold Bank 1. (not applicable for 15-18 models)"

JEEP · 2025-03-01

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

JEEP · 2025-03-01

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

RAM · 2025-03-01

"Flash: Ignition System Control Module (ISCM) 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): ● **P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2.** ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. Customers may also comment on the following: ●…

RAM · 2025-02-28

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

JEEP · 2025-02-28

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

JEEP · 2025-02-27

"Flash: Ignition System Control Module (ISCM) 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): ● P2C30-00 - Ignition Coil Primary Circuit Fuse A. ● P2C31-00 - Ignition Coil Primary Circuit Fuse B. ● P0300-00 - Multiple Cylinder Misfire. ● P0301-00 - Cylinder 1 Misfire Detected. ● P0302-00 - Cylinder 2 Misfire Detected. ● P0303-00 - Cylinder 3 Misfire Detected. ● P0304-00 - Cylinder 4 Misfire Detected. ● P0305-00 - Cylinder 5 Misfire Detected. ● P0306-00 - Cylinder 6 Misfire Detected. ● P0420-00 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430-00 - Catalyst System Efficiency Below Threshold Bank 2. Customers may also comment on the following: ● Engine…

HONDA · 2025-02-22

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catalyst System Effciency Below Threshold] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.

HONDA · 2025-02-08

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catalyst System Effciency Below Threshold] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.

BUICK · 2025-01-29

This service bulletin provides information for dealers/technicians on DTC P0420 Setting.