Cummins ISB CM850 (2003-06) Fault Code: 272 (ISC – Auto) PID: SID 126 SPN: 1347 FMI: 3 High Fuel Pressure Solenoid Valve Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the fuel pump actuator circuit. This fault becomes active when the ECM detects an open in the fuel pump actuator circuit. Causes of this fault code are a short circuit to a positive voltage or an open circuit in the fuel pump actuator circuit. If there is high harness resistance or an intermittent open circuit, Fault Code 2311 could have...

Cummins ISB CM850 (2003-06) Fault Code: 275 PID: SID 126 SPN: 1347 FMI: 7 Fuel Pumping Element Number 1 (Front) – Mechanical System Not Responding Properly or Out of Adjustment. Fault Code 275 will most likely come active while operating at a steady state loaded condition. At this condition commanded fuel pressures are highest and the pump’s pressure balance is affected the most. If a high pressure seal has failed, pump head drain flow will be excessive. If a seal failure has progressed far enough, the engine may not start because of an inability to develop fuel rail pressure. If...

Cummins ISB CM850 (2003-06) Fault Code: 2771 PID: SPN: 3234 FMI: 9 Aftertreatment Outlet NOx Sensor – Abnormal Update Rate. No communications or valid data transfer rate detected on the J1939 datalink between the ECM and the aftertreatment outlet NOx sensor. On-Board Diagnostics (OBD) Information (Euro 4 Stage 1+ Certified Engines): 1)The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.2)An engine torque derate will be activated after 50 hours of engine operation with the fault code active.3)The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does...

Cummins ISB CM850 (2003-06) Fault Code: 2772 PID: SPN: 3226 FMI: 15 Aftertreatment Outlet NOx – Data Valid But Above Normal Operational Range – Least Severe Level. The engine NOx output is higher than recommended levels. On-Board Diagnostics (OBD) Information (Euro 4 Stage 1+ Certified Engines): 1)The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.2)The ECM turns OFF the malfunction indicator lamp (MIL) after one ignition cycle that the diagnostic runs and does not fail. The MIL lamp and fault code can not be cleared using INSITE? electronic service...

Cummins ISB CM850 (2003-06) Fault Code: 2773 PID: SPN: 3226 FMI: 0 Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Most Severe Level. The engine NOx output is higher than recommended levels. On-Board Diagnostic (OBD) Information (Euro 4 Stage 1+ Certified Engines): 1)The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.2)An engine torque derate will be activated immediately after the fault code becomes active.3)The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The...