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19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4281 PID: SPN: 5848 FMI: 2 Aftertreatment 1 SCR Intermediate NH3- Data Erratic, Intermittent, or Incorrect

Circuit DescriptionThe aftertreatment SCR intermediate NH3 (ammonia) sensor is a smart device that communicates with the engine control module via...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4289 PID: SPN: 91 FMI: 8 Accelerator Pedal or Lever Position Sensor 1 Circuit Frequency- Abnormal Frequency or Pulse Width or Period

Circuit DescriptionThe accelerator position sensor is a Hall effect sensor attached to the accelerator pedal. The accelerator position sensor varies...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 429 PID: SPN: 97 FMI: 4 Water-In-Fuel Indicator Sensor Circuit- Voltage Below Normal or Shorted to Low Source

Circuit DescriptionThe water-in-fuel sensor is attached to the fuel filter. The engine control module (ECM) provides a 5 volt reference...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4293 PID: SPN: 5097 FMI: 3 Engine Brake Active lamp- Voltage Above Normal or Shorted to High Source

Circuit DescriptionThe brake lamp relay is an OEM optional component used to illuminate the vehicle’s brake lamps under conditions when...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4294 PID: SPN: 5097 FMI: 4 Engine Brake Active lamp- Voltage Below Normal or Shorted to Low Source

Circuit DescriptionThe brake lamp relay is an OEM optional component used to illuminate the vehicle’s brake lamps under conditions when...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 435 PID: PID 100 SPN: 100 FMI: 2 Engine Oil Rifle Pressure- Data Erratic, Intermittent, or Incorrect

Circuit DescriptionAn engine oil pressure switch or oil pressure sensor is used by the engine control module (ECM) to monitor...

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