Cummins ISX11.9 code 2265 is the diagnostic fault code for the electric lift pump for engine fuel supply circuit reading above normal (Heavy Duty), and this page describes the official Cummins troubleshooting document for it. This fault is reported as SPN 1075 / FMI 3, and PID S126. The 28-page PDF gives the circuit description, the conditions that set fault code 2265, the action taken when it is active, and the guided troubleshooting steps needed to confirm and repair it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | DTCs — Fault Code 2265 |
| SPN / FMI | 1075 / 3 |
| PID | S126 |
| Warning lamp | Amber |
| Pages | 28 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Fault code 2265 — reason, cause and effect
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk — possible causes
- Associated procedures and guided troubleshooting steps
Cummins ISX11.9 code 2265 coverage
The fuel lift pump relay is controlled by the ECM and provides power to the fuel lift pump; the relay is installed in the engine wiring harness near the ECM. The procedure covers ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines and is shared across the CM2250 engine family listed in the associated procedures table. Cummins publishes the full specifications and service procedures for this engine family; see the manufacturer at Cummins.
The document lists the possible causes the factory tree checks:
- a short to a high voltage source in the relay control circuit
- a damaged engine harness connector
- a malfunctioning fuel lift pump relay
Who needs this Cummins ISX11.9 code 2265 manual
Fleet technicians and workshop owners will use this guide to read the amber-lamp fault with the INSITE electronic service tool, inspect the fuel lift pump relay and its wiring, and decide whether the sensor, harness, or ECM is at fault. Confirm ISX11.9 code 2265 against live data before replacing any part, and follow the guided troubleshooting steps in the order the document gives them.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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