Cummins ISB CM850 (2003-06) Fault Code: 2272 PID: 27 SPN: 27 FMI: 4 Exhaust Gas Recirculation (EGR) valve position circuit - voltage below normal or shorted to low source. Low signal voltage detected at the EGR valve position sensor circuit.

The EGR valve position sensor shares SUPPLY and RETURN wires in the engine harness with other sensors. Open circuits and short circuits in the engine harness can cause multiple fault codes to be active.

Possible causes:

1)SIGNAL circuit open or shorted to ground
2)SUPPLY circuit open or shorted to ground
3)Sensor shorted to ground.

Possible repairs:

1)Replace the EGR valve assembly.
2)Repair or replace the engine harness.
3)Replace the engine control module.

Cummins ISB CM850 (2003-06) Fault Code: 2271 PID: 27 SPN: 27 FMI: 3 Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at the EGR valve position sensor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2266 PID: SID 126 SPN: 1075 FMI: 4 Electric Lift Pump for Engine Fuel Supply Circuit - Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the fuel lift pump circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2265 PID: SID 126 SPN: 1075 FMI: 3 Electric Lift Pump for Engine Fuel Supply Circuit - Voltage Above Normal, or Shorted to High Source. High voltage or open detected at the fuel lift pump signal circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2249 PID: 157 SPN: 157 FMI: 1 Injector Metering Rail 1 Pressure - Data Valid but Below Normal Operational Range - Most Severe Level. The ECM has detected that fuel pressure is lower than commanded pressure.

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