# P0128 on the 2023 Ram 3500

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 P0128

- [11029679](https://open.wenmarpro.com/bulletins/11029679), 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 \(DTCs\): ● P0128\-00 \- Thermostat Rationality. ● P24A4\-00 \- Particulate Filter Restriction \- Soot Accumulation Too High. ● P208B\-00 \- Reductant Pump 1 Control Performance.\*\* Customers may experience one or more of the following: ● Lower than expected fuel economy when vehicle is lightly loaded, operating in stop and go traffic and at lower speeds. ● Long cranking / extended starting times. \*\*Other software enhancement included with this update: ● "Air Handling Performance Test" is now available to help troubleshoot air handling DTCs.\*\* This bulletin involves reprogramming the PCM with the latest available software.
- [11022176](https://open.wenmarpro.com/bulletins/11022176), 2025-08-27: 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 \(DTCs\): ● P245D\-00 \- EGR Cooler Bypass Control Circuit High. ● P02E3\-00 \- Diesel Intake Air Flow Control Circuit High. ● P0490\-00 \- EGR Control Circuit High. ● P229F\-00 \- Aftertreatment NOX Sensor Circuit Performance \- Bank 1 Sensor 2. ● P0299\-00 \- Turbocharger Underboost. ● P242F\-00 \- Diesel Particulate Filter Restriction \- Ash Accumulation. ● P0128\-00 \- Thermostat Rationality. ● P0234\-00 \- Turbocharger Overboost Condition.\*\* Customers may also comment on one or more of the following: ● \*\*Engine speed unstable when vehicle is stationary, not in gear and running on high speed governor \(max engine speed\).\*\* ● Longer crank time than normal. ● Transmission overheat conditions with a message displayed in the Instrument Panel Cluster \(IPC\) stating "Transmission oil temperature is too hot" This bulletin involves reprogramming the Engine Control Module \(ECM/PCM\) with the latest available software.
- [11022174](https://open.wenmarpro.com/bulletins/11022174), 2025-08-27: 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 \(DTCs\): ● P245D\-00 \- EGR Cooler Bypass Control Circuit High. ● P02E3\-00 \- Diesel Intake Air Flow Control Circuit High. ● P0490\-00 \- EGR Control Circuit High. ● P229F\-00 \- Aftertreatment NOX Sensor Circuit Performance \- Bank 1 Sensor 2. ● P0299\-00 \- Turbocharger Underboost. ● P242F\-00 \- Diesel Particulate Filter Restriction \- Ash Accumulation. ● P0128\-00 \- Thermostat Rationality. ● P0234\-00 \- Turbocharger Overboost Condition.\*\* Customers may also comment on one or more of the following: ● \*\*Engine speed unstable when vehicle is stationary, not in gear and running on high speed governor \(max engine speed\).\*\* ● Longer crank time than normal. ● Transmission overheat conditions with a message displayed in the Instrument Panel Cluster \(IPC\) stating "Transmission oil temperature is too hot" This bulletin involves reprogramming the Engine Control Module \(ECM/PCM\) with the latest available software.