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: 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.

On 12 VDC Automotive and 24 VDC Industrial or Marine systems, this fault code becomes active if the ECM detects an open circuit at keyswitch ON. The cause of this fault code is an open circuit in the electric fuel lift pump circuit.

If the fault code is intermittent, look for causes of an intermittent open circuit, such as loose pins and bad connections. At keyswitch ON, the lift pump duty cycle ramps to 100 percent. This fault code can detect open circuit conditions only at keyswitch ON. If an open circuit condition is indicated after the engine is started (while the lift pump is already running), Fault Code 2265 will not become active.

On 24 VDC Automotive systems, this fault code becomes active if the ECM detects an open circuit at keyswitch ON. Causes of this fault code are an open circuit in the electric fuel lift pump wiring harness, relay, or engine harness. This fault code will not become active if the voltage regulator or electric fuel lift pump has failed.

Possible repairs:

1)Replace the electric fuel lift pump relay.
2)Repair or replace the electric fuel lift pump wiring harness.
3)Replace the engine harness.
4)Replace the electric fuel lift pump.
5)Replace the ECM.