Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp...
Ram technical service bulletin 18-023-26 for 2023 Ram 5500 and 2023 Ram 4500.
- Bulletin number
- 18-023-26
- Component
- Engine
- Summary
- 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.
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