# P0402 on the 2017 Ram 1500

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 P0402

- [10221889](https://open.wenmarpro.com/bulletins/10221889), 2022-09-26: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Some 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 \(DTCs\) have been set:P1D30\-00 \- Oil Viscosity Too Low. Attempting to clear the DTC will be unsuccessful. P2453\-00 \- Diesel Particulate Filter Differential Pressure Sensor Circuit Performance. P0401\-00 \- EGR Flow Insufficient Detected. P0133\-00 \- O2 Sensor 1/1 Slow Response. P20EE\-00 \- SCR NOX Catalyst Efficiency Below Threshold Bank 1. P050E\-00 \- Cold Start Engine Exhaust Temperature Too Low. P0299\-00 \- Turbocharger Underboost Condition. P0402\-00 \- EGR Flow Excessive Detected. P245B \- EGR Cooler Bypass Control Circuit Performance. P20C6 \- Reductant Heater 4 Control Circuit Performance. P208B \- Reductant Pump 1 Control Performance. P249C \- Excessive Time To Enter Closed Loop Reductant Injection Control. P20E8\-00 \- Reductant Pressure Too Low. P20E9\-00 \- Reductant Pressure Too High. In addition, the following software enhancement is available:Ability to enable the ?Fuel System Cleaning? routine in wiTECH.
- [10181621](https://open.wenmarpro.com/bulletins/10181621), 2020-10-26: 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 one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set:P1D30\-00 \- Oil Viscosity Too Low. Attempting to clear the DTC P1D30\-00 will be unsuccessful. P2453\-00 \- Diesel Particulate Filter Differential Pressure Sensor Circuit Performance. P0401\-00 \- EGR Flow Insufficient Detected. P0133\-00 \- O2 Sensor 1/1 Slow Response. P20EE\-00 \- SCR NOX Catalyst Efficiency Below Threshold Bank 1. P050E\-00 \- Cold Start Engine Exhaust Temperature Too Low. P0299\-00 \- Turbocharger Underboost condition. P0402\-00 \- EGR Flow Excessive Detected. P245B \- EGR Cooler Bypass Control Circuit Performance. P20C6 \- Reductant Heater 4 Control Circuit Performance. P208B \- Reductant Pump 1 Control Performance. P249C \- Excessive Time To Enter Closed Loop Reductant Injection Control. P20E8\-00 \- Reductant Pressure Too Low. P20E9\-00 \- Reductant Pressure Too High. The following software enhancement is available:Some vehicles may have experienced a slight engine hesitation or lag in acceleration from engine start\-up until the engine and exhaust warmed up. This update is intended to reduce the hesitation or lag in acceleration from engine start\-up. In addition, the following software enhancement is also available:Ability to enable the ?Fuel System Cleaning? routine in wiTECH.
- [10181619](https://open.wenmarpro.com/bulletins/10181619), 2020-10-26: 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 one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set:P1D30\-00 \- Oil Viscosity Too Low.Attempting to clear the DTC P1D30\-00 will be unsuccessful. P2453\-00 \- Diesel Particulate Filter Differential Pressure Sensor Circuit Performance. P0401\-00 \- EGR Flow Insufficient Detected. P0133\-00 \- O2 Sensor 1/1 Slow Response. P20EE\-00 \- SCR NOX Catalyst Efficiency Below Threshold Bank 1. P050E\-00 \- Cold Start Engine Exhaust Temperature Too Low. P0299\-00 \- Turbocharger Underboost Condition. P0402\-00 \- EGR Flow Excessive Detected. P245B \- EGR Cooler Bypass Control Circuit Performance. P20C6 \- Reductant Heater 4 Control Circuit Performance. P208B \- Reductant Pump 1 Control Performance. P249C \- Excessive Time To Enter Closed Loop Reductant Injection Control. P20E8\-00 \- Reductant Pressure Too Low. P20E9\-00 \- Reductant Pressure Too High. The following software enhancement is available:Some vehicles may have experienced a slight engine hesitation or lag in acceleration from engine start\-up until the engine and exhaust warmed up. This update is intended to reduce the hesitation or lag in acceleration from engine start\-up. In addition, the following software enhancement is also available:Ability to enable the ?Fuel System Cleaning? routine in wiTECH.
- [10180279](https://open.wenmarpro.com/bulletins/10180279), 2020-09-28: Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Some 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 \(DTCs\) have been set:P1D30\-00 \- Oil Viscosity Too Low. Attempting to clear the DTC will be unsuccessful. P2453\-00 \- Diesel Particulate Filter Differential Pressure Sensor Circuit Performance. P0401\-00 \- EGR Flow Insufficient Detected. P0133\-00 \- O2 Sensor 1/1 Slow Response. P20EE\-00 \- SCR NOX Catalyst Efficiency Below Threshold Bank 1. P050E\-00 \- Cold Start Engine Exhaust Temperature Too Low. P0299\-00 \- Turbocharger Underboost Condition. P0402\-00 \- EGR Flow Excessive Detected. P245B \- EGR Cooler Bypass Control Circuit Performance. P20C6 \- Reductant Heater 4 Control Circuit Performance. P208B \- Reductant Pump 1 Control Performance. P249C \- Excessive Time To Enter Closed Loop Reductant Injection Control. P20E8\-00 \- Reductant Pressure Too Low. P20E9\-00 \- Reductant Pressure Too High. In addition, the following software enhancement is available:Ability to enable the ?Fuel System Cleaning? routine in wiTECH.