# P242B on the 2026 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.

## Bulletins for this model year that name P242B

- [11035055](https://open.wenmarpro.com/bulletins/11035055), 2026-07-18: Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0088\-00 \- Fuel Rail Pressure Too High \- Bank 1. ● P208B\-00 \- Reductant Pump 1 Control Performance. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P0506\-00 \- Idle Control System RPM \- Lower Than Expected. ● P20CF\-00 \- Exhaust Aftertreatment Fuel Injector "A" Stuck Open. ● P20DB\-00 \- Exhaust Aftertreatment Fuel Supply Control Stuck Open. ● P040B\-00 \- EGR Temperature Sensor 1 Circuit Performance. ● U0109\-00 \- Lost Communication With Fuel Pump Control Module. ● P1451\-00 \- Diesel Particulate Filter System Performance. ● P2463\-00 \- Diesel Particulate Filter Restriction \- Soot Accumulation Bank 1. ● P1191\-00\-Inlet Air Temperature Sensor Rational/Performance. ● P242F\-00\-Diesel Particulate Filter Restriction \- Ash Accumulation. ● P229F\-00 \- NOX Sensor Circuit Range/Performance \- Bank 1. ● P2281\-00 \- Air Leak Between MAF And Throttle Body. ● P0087\-00 \- Fuel Rail Pressure Too Low. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543\-00 \- Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D\-00 \- SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B\-00 \- Exhaust Gas Temperature Sensor Circuit Performance \- Bank 1 Sensor 3. ● P24DA \- Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE\-00 \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1 Catalyst 1. ● P226C\-00 \- Turbocharger Boost Control "A" Slow Response. ● P2281\-00 \- Air Leak Between Maf And Throttle Body. ● P229F\-00 \- Nox Sensor Circuit Range/performance \- Bank 1. ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P203F\-00 \- Reductant Level Too Low. ● P0423\-00 \- Heated Catalyst Efficiency Below Threshold Bank 1. ● P06B9\-00 \- Cylinder 1 Glow Plug Circuit Performance. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11035053](https://open.wenmarpro.com/bulletins/11035053), 2026-07-18: Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0088\-00 \- Fuel Rail Pressure Too High \- Bank 1. ● P208B\-00 \- Reductant Pump 1 Control Performance. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P0506\-00 \- Idle Control System RPM \- Lower Than Expected. ● P20CF\-00 \- Exhaust Aftertreatment Fuel Injector "A" Stuck Open. ● P20DB\-00 \- Exhaust Aftertreatment Fuel Supply Control Stuck Open. ● P040B\-00 \- EGR Temperature Sensor 1 Circuit Performance. ● U0109\-00 \- Lost Communication With Fuel Pump Control Module. ● P1451\-00 \- Diesel Particulate Filter System Performance. ● P2463\-00 \- Diesel Particulate Filter Restriction \- Soot Accumulation Bank 1. ● P1191\-00 \- Inlet Air Temperature Sensor Rational/Performance. ● P242F\-00 \- Diesel Particulate Filter Restriction \- Ash Accumulation. ● P229F\-00 \- NOX Sensor Circuit Range/Performance \- Bank 1. ● P2281\-00 \- Air Leak Between MAF And Throttle Body. ● P0087\-00 \- Fuel Rail Pressure Too Low. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543\-00 \- Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D\-00 \- SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B\-00 \- Exhaust Gas Temperature Sensor Circuit Performance \- Bank 1 Sensor 3. ● P24DA \- Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE\-00 \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1 Catalyst 1. ● P226C\-00 \- Turbocharger Boost Control "A" Slow Response. ● P2281\-00 \- Air Leak Between Maf And Throttle Body. ● P229F\-00 \- Nox Sensor Circuit Range/performance \- Bank 1. ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P203F\-00 \- Reductant Level Too Low. ● P0423\-00 \- Heated Catalyst Efficiency Below Threshold Bank 1. ● P06B9\-00 \- Cylinder 1 Glow Plug Circuit Performance. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11032970](https://open.wenmarpro.com/bulletins/11032970), 2026-05-28: 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 \(DTCs\): ● \*\*P0088\-00 \- Fuel Rail Pressure Too High \- Bank 1. ● P208B\-00 \- Reductant Pump 1 Control Performance.\*\* ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P0506\-00 \- Idle Control System RPM \- Lower Than Expected. ● P20CF\-00 \- Exhaust Aftertreatment Fuel Injector "A" Stuck Open. ● P20DB\-00 \- Exhaust Aftertreatment Fuel Supply Control Stuck Open. ● P040B\-00 \- EGR Temperature Sensor 1 Circuit Performance. ● U0109\-00 \- Lost Communication With Fuel Pump Control Module. ● P1451\-00 \- Diesel Particulate Filter System Performance. ● P2463\-00 \- Diesel Particulate Filter Restriction \- Soot Accumulation Bank 1. ● P1191\-00\-Inlet Air Temperature Sensor Rational/Performance. ● P242F\-00\-Diesel Particulate Filter Restriction \- Ash Accumulation. ● P229F\-00 \- NOX Sensor Circuit Range/Performance \- Bank 1. ● P2281\-00 \- Air Leak Between MAF And Throttle Body. ● P0087\-00 \- Fuel Rail Pressure Too Low. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543\-00 \- Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D\-00 \- SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B\-00 \- Exhaust Gas Temperature Sensor Circuit Performance \- Bank 1 Sensor 3. ● P24DA \- Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE\-00 \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1 Catalyst 1. ● P226C\-00 \- Turbocharger Boost Control "A" Slow Response. ● P2281\-00 \- Air Leak Between Maf And Throttle Body. ● P229F\-00 \- Nox Sensor Circuit Range/performance \- Bank 1. ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P203F\-00 \- Reductant Level Too Low. ● P0423\-00 \- Heated Catalyst Efficiency Below Threshold Bank 1. ● P06B9\-00 \- Cylinder 1 Glow Plug Circuit Performance. ● P06BA\-00 \- Cylinder 2 Glow Plug Circuit Performance. ● P06BB\-00 \- Cylinder 3 Glow Plug Circuit Performance. ● P06BC\-00 \- Cylinder 4 Glow Plug Circuit Performance. ● P06BD\-00 \- Cylinder 5 Glow Plug Circuit Performance. ● P06BE\-00 \- Cylinder 6 Glow Plug Circuit Performance. ● P020A\-00 \- Cylinder 1 Injection Timing. ● P0263\-00 \- Cylinder 1 Contribution/Balance. ● P0266\-00 \- Cylinder 2 Contribution/Balance. ● P0269\-00 \- Cylinder 3 Contribution/Balance. ● P0272\-00 \- Cylinder 4 Contribution/Balance. ● P0275\-00 \- Cylinder 5 Contribution/Balance. ● P0278\-00 \- Cylinder 6 Contribution/Balance. ● P026B\-00 \- Injection Timing Performance. Customers may experience one or more of the following: ● \*\*An eventual 8 kph \(5 mph\) vehicle speed derate if the issue does not selfheal.\*\* ● Instrument Panel Cluster \(IPC\) related messages: ○ Desoot Required. ○ Soot Filter Nearly Full. ○ Exhaust Filter Full Power Reduced See Dealer. ● Long engine crank times, particularly after fuel filter change. ● Inverter drops out when shifting from park to drive. ● Diesel Exhaust Fluid level gauge inaccuracy. ● Poor cold start performance. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [11031237](https://open.wenmarpro.com/bulletins/11031237), 2026-04-10: Active/Pending Diagnostic Trouble Code \(DTC\) P24A0, P2482, P2481, P0420, P2470, P2471, P2472, P242D, P242B, P244D, P1484, P106D, P1060 And/or P354B Setting In The Powertrain Control Module \(PCM\)
- [11029680](https://open.wenmarpro.com/bulletins/11029680), 2026-03-05: Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P0506\-00 \- Idle Control System RPM \- Lower Than Expected. ● P20CF\-00 \- Exhaust Aftertreatment Fuel Injector "A" Stuck Open. ● P20DB\-00 \- Exhaust Aftertreatment Fuel Supply Control Stuck Open. ● P040B\-00 \- EGR Temperature Sensor 1 Circuit Performance. ● U0109\-00 \- Lost Communication With Fuel Pump Control Module. ● P1451\-00 \- Diesel Particulate Filter System Performance. ● P2463\-00 \- Diesel Particulate Filter Restriction \- Soot Accumulation Bank 1. ● P1191\-00\-Inlet Air Temperature Sensor Rational/Performance. ● P242F\-00\-Diesel Particulate Filter Restriction \- Ash Accumulation. ● P229F\-00 \- NOX Sensor Circuit Range/Performance \- Bank 1. ● P2281\-00 \- Air Leak Between MAF And Throttle Body.\*\* ● P0087\-00 \- Fuel Rail Pressure Too Low. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543\-00 \- Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D\-00 \- SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B\-00 \- Exhaust Gas Temperature Sensor Circuit Performance \- Bank 1 Sensor 3. ● P24DA \- Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE\-00 \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1 Catalyst 1. ● P226C\-00 \- Turbocharger Boost Control "A" Slow Response. ● P2281\-00 \- Air Leak Between Maf And Throttle Body. ● P229F\-00 \- Nox Sensor Circuit Range/performance \- Bank 1. ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P203F\-00 \- Reductant Level Too Low. ● P0423\-00 \- Heated Catalyst Efficiency Below Threshold Bank 1. ● P06B9\-00 \- Cylinder 1 Glow Plug Circuit Performance. ● P06BA\-00 \- Cylinder 2 Glow Plug Circuit Performance. ● P06BB\-00 \- Cylinder 3 Glow Plug Circuit Performance. ●
- [11025715](https://open.wenmarpro.com/bulletins/11025715), 2025-11-26: 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 \(DTCs\): ● P0087\-00 \- Fuel Rail Pressure Too Low. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/Performance. ● P2543\-00 \- Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D\-00 \- SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B\-00 \- Exhaust Gas Temperature Sensor Circuit Performance \- Bank 1 Sensor 3. ● P24DA \- Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE\-00 \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1 Catalyst 1. ● P226C\-00 \- Turbocharger Boost Control "A" Slow Response. ● P2281\-00 \- Air Leak Between Maf And Throttle Body. ● P229F\-00 \- Nox Sensor Circuit Range/performance \- Bank 1. ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P203F\-00 \- Reductant Level Too Low. ● P0423\-00 \- Heated Catalyst Efficiency Below Threshold Bank 1. ● P06B9\-00 \- Cylinder 1 Glow Plug Circuit Performance. ● P06BA\-00 \- Cylinder 2 Glow Plug Circuit Performance. ● P06BB\-00 \- Cylinder 3 Glow Plug Circuit Performance. ● P06BC\-00 \- Cylinder 4 Glow Plug Circuit Performance. ● P06BD\-00 \- Cylinder 5 Glow Plug Circuit Performance. ● P06BE\-00 \- Cylinder 6 Glow Plug Circuit Performance. ● P020A\-00 \- Cylinder 1 Injection Timing. ● P0263\-00 \- Cylinder 1 Contribution/Balance. ● P0266\-00 \- Cylinder 2 Contribution/Balance. ● P0269\-00 \- Cylinder 3 Contribution/Balance. ● P0272\-00 \- Cylinder 4 Contribution/Balance. ● P0275\-00 \- Cylinder 5 Contribution/Balance. ● P0278\-00 \- Cylinder 6 Contribution/Balance. ● P026B\-00 \- Injection Timing Performance. Customers may experience one or more of the following: ● Inverter drops out when shifting from park to drive. ● Diesel Exhaust Fluid level gauge inaccuracy This bulletin involves reprogramming the PCM with the latest available software.
- [11023088](https://open.wenmarpro.com/bulletins/11023088), 2025-09-10: Powertrain Contol Module Over The Air Update to V2B \(Diesel Only\) Software Version \(FOTA\) 2025 \- 2026 \(DJ\) RAM 2500 Pickup 2025 \- 2026 \(D2\) RAM 3500 Pickup 2025 \- 2026 \(DD\) RAM 3500 Cab Chassis 2025 \- 2026 \(DF\) RAM 3500 10K Lb. Cab Chassis2025 \- 2026 \(DP\) RAM 4500/5500 Cab Chassis Customers may experience one or more of the following: \- Power Inverter \(110V connection\) drops out when shifting from P to D \- DEF \(Diesel Exhaust Fluid\) level gauge inaccuracy \- Poor cold start performance \- Instrument Panel Cluste MIL \(Malfunction Indicator Light\) ON; Possible P\-codes: P0087/P2540/P2543 Fuel Pressure P214D/P242B SCR Temperature P24DA PM Sensor P20EE SCR Efficiency P226C/P2281 Mass Charge Flow P229F System Outlet NOx Sensor P0100 MAF Sensor P203F DEF Level P0423 DOC Efficiency