Cummins ISB CM850 (2003-06) Fault Code: 2961 PID: 412 SPN: 412 FMI: 15 Exhaust Gas Recirculation (EGR) temperature – Data Valid but Above Normal Operating Range, Least Severe Level.
NOTE: This fault code will probably not be active with no load on the engine in the shop. The engine must be loaded to trip this fault code and determine if the malfunction has been found and fixed.
1)Repair or replace the leaking component.
2)Drain and refill the cooling system with the proper mixture.
3)Replace the EGR valve.
4)Clean or replace the EGR cooler.
5)Replace the variable geometry turbocharger.
6)Replace the EGR differential pressure sensor.
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.
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.
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.
Cummins ISB CM850 (2003-06) Fault Code: 2559 PID: SPN: 1845 FMI: 4 Transmission ECU to ECM Communication Lost – Abnormal Update Rate. No communication or an invalid data transfer rate has been detected between the ECM and the transmission ECU.
Cummins ISB CM850 (2003-06) Fault Code: 2558 PID: SID 57 SPN: 697 FMI: 4 Auxiliary PWM Driver #1 – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the analog torque circuit.
Cummins ISB CM850 (2003-06) Fault Code: 2557 PID: SID 57 SPN: 697 FMI: 3 Auxiliary PWM Driver #1 – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the analog torque circuit
