P0401 on the 2022 Ram 2500
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.
| 18-005-23 | 2023-02-13. Service bulletin. Flash: Powertrain Control Module (PCM) Updates 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: **P0299 - Turbocharger Underboost.** P026B-00 - Injection Timing Performance. P061B-00 - Internal Control Module Torque Calculation Performance. P1451-00 - Diesel Particulate Filter System Performance. P0755-00 - Shift Solenoid ?B? (DG7 Trans Sales Code). P0765-00 - Shift Solenoid ?D?(DG7 Only). P0401-00 - EGR System Performance Customers may also experience the following: **Service Exhaust System message in the Electronic Vehicle Information Center (EVIC) with no MIL.** Improvements to cold temperature engine rpm fluctuation. Reduce audible engine flare during upshifts (DG7 Only). Improvements to help prevent OD clutch premature wear (DG7 Only). 1-2-1 gear hunting on grades while operating under high loads in areas of low traction (e.g. rain, snow, ice or dirt) (DG7 Only). wiTECH Fuel System Run-Up Test routine Improvement. Idle stability Improvement. wiTECH PCM data improvements. wiTECH cylinder cut-out routine, improvement. This bulletin involves reprogramming the Engine Control Module/Powertrain Control Module (ECM/PCM) with the latest available software. |
|---|---|
| 1809422REVB | 2022-12-12. Service bulletin. 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 DTCs have been set: P0299-00 - Turbocharger Underboost. P026B-00 - Injection Timing Performance. P061B-00 - Internal Control Module Torque Calculation Performance. P1451-00 - Diesel Particulate Filter System Performance. P0755-00 - Shift Solenoid "B"(DG7 Trans Sales Code). P0765-00 - Shift Solenoid "D"(DG7 Only). P0401-00 - EGR System Performance. The following improvements are also included in this update:Improvements to cold temperature engine rpm fluctuation. Reduce audible engine flare during upshifts(DG7 Only). Improvements to help prevent OD clutch premature wear (DG7 Only). 1-2-1 gear hunting on grades while operating under high loads in areas of low traction (e.g. rain, snow, ice or dirt)(DG7 Only) wiTECH Fuel System Run-Up Test routine Improvement. Idle stability Improvement. wiTECH PCM data improvements. wiTECH cylinder cut-out routine, improvement. |
| 1809422REVA | 2022-11-07. Service bulletin. 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 DTCs have been set: P0401-00 - EGR System Performance. P0299-00 - Turbocharger Underboost (ETM Only). The following improvements are also included in this update: wiTECH Fuel System Run-Up Test routine Improvement. Idle stability Improvement. wiTECH PCM data improvements. wiTECH cylinder cut-out routine, improvement |
| 18-094-22 | 2022-06-27. Service bulletin. 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: P0401-00 - EGR System Performance. P0299-00 - Turbocharger Underboost (ETM Only). P0755-00 - 2C Solenoid Circuit. P0765-00 - UD Solenoid Circuit. The following improvements are also included in this update: wiTECH PCM data improvements. wiTECH cylinder cut-out routine, improvement |
4 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.