# P0420 on the 2019 Dodge Challenger

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 P0420

- [11012186](https://open.wenmarpro.com/bulletins/11012186), 2025-01-03: "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. NOTE: If DTC P0456 is present use the wiTECH Small Leak Verification test \(SLVT\) to determine if a leak is present in the system. This bulletin involves reprogramming the PCM with the latest available software."
- [10187697](https://open.wenmarpro.com/bulletins/10187697), 2021-03-01: 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 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 also describe the following: Hearing a pre\-detonation noise \(Spark Knock\) sound in the engine during acceleration.