FC 2265 — Electric Lift Pump Circuit – Voltage Above Normal (SPN 1075 FMI 3) — Cummins ISX15
The ECM sees voltage on the electric lift pump circuit above the normal range or an open condition. On Cummins ISX15 (2010–2017) the electric lift pump…
What it means
Cummins FC 2265 maps to SPN 1075 FMI 3. Generic definition: the electric lift pump circuit voltage is above normal or open. Typical on this platform: an open lift pump circuit, connector or failed lift pump.1
Most likely causes
- Open or high-resistance connection in the lift pump power or ground circuit, or a loose/corroded connector at the pump or ECM harness. — An open circuit raises the sensed voltage reading. Inspect the lift pump connector, chassis harness, and ECM connector for corrosion, bent pins, or loose terminals. Check continuity and resistance of the power and ground wires.1
- Failed electric lift pump (internal open winding or failed driver). — A failed pump can present as an open circuit to the ECM. Verify pump operation and current draw with a scan tool and direct test; compare to known-good values.1
- ECM lift-pump driver or internal sensing fault. — If wiring and pump test good, the ECM may be reporting an erroneous high-voltage condition. Confirm with wiring tests before condemning the ECM.1
How to diagnose
- Confirm FC 2265 is active and note snapshot data (battery voltage, engine state).
- Inspect lift pump connector and harness for corrosion, moisture, or damage; repair as needed.
- Perform a continuity and resistance check of the lift pump power and ground circuits from ECM to pump.
- Command lift pump on with scan tool and measure voltage at the pump connector; compare to spec and observe pump operation.
- If wiring and pump are good, check ECM connector pins for corrosion or bent terminals and retest.
- Clear codes and retest after repairs; monitor for return of SPN 1075 FMI 3.
Parts and tools you may need
- Digital multimeter
- Scan tool capable of Cummins FC/SPN/FMI and bi-directional lift pump control
- Wiring diagram for CM2250/CM2350
- Contact cleaner and dielectric grease
- Replacement lift pump and pigtail as needed
Tools you’ll need
- digital multimeter — Measures voltage at the lift pump connector and checks continuity/resistance of power and ground circuits from ECM to pump.
- OBD-II scan tool — Reads active FC 2265/SPN 1075 FMI 3, views snapshot data, and commands the lift pump on for live voltage and operation tests.
- wiring repair kit — Repairs corroded, damaged, or loose lift pump harness and connector terminals found during inspection.
- inspection light — Provides clear visibility to inspect the lift pump connector, ECM harness, and wiring for corrosion, moisture, or damage.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Wiring or connector repair | $10–$100 | 1–4 hrs | DIY with tools and a manual |
| Lift pump / fuel transfer pump | $100–$400 | 1–3 hrs | DIY with tools and a manual |
| ECM/PCM replacement (programmed) | $1,500–$3,500 | 1–3 hrs | Shop |
Typical US independent-shop figures; labor runs about $140–$200 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If wiring tests are inconclusive, the ECM is suspected, or the fault returns after pump replacement, have a Cummins-certified technician perform pinpoint tests and ECM evaluation. Do not attempt high-pressure fuel system service without proper training and tools.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Spotted an error, or something missing? Tell us
Run a Cummins ISX15? This goes straight to the editor — it is not published.