Cummins fault code 1911 is the Cummins Injector Metering Rail 1 Pressure – Data Valid But Above Normal Operational Range – Most Severe Level document for the ISX11.9 CM2250 (2010-12) engine platform, a 38-page PDF that reproduces the official fault code write-up read with Cummins INSITE. The ECM controls the fuel pump actuator to hold the commanded rail pressure, and the fuel rail pressure relief valve protects the high-pressure components from over-pressurization.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISB6.7, ISC8.3, ISL9 and ISX CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 1911 — PID P157, SPN 157, FMI 0 |
| Warning lamp | Amber |
| Publication reference | Cummins troubleshooting bulletin 2883445 (injector metering rail 1 pressure circuit) |
| Pages | 38 |
| File size | 0.6 MB |
| Format | |
| Language | English |
What Cummins fault code 1911 means
It sets when the ECM verifies that fuel rail pressure has exceeded the relief valve limiting pressure and the relief valve has opened. Active and stationary regeneration are disabled, the EGR valve closes, and engine torque is reduced after extended operation; some engine noise or a brief power interruption may occur. The document walks a technician through the summary and the guided troubleshooting steps needed to confirm and clear the code.
Document table of contents
- Overview and circuit description
- Component location
- 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 and possible causes
- Associated procedures and guided troubleshooting steps
Applicable truck models
This troubleshooting document covers Cummins ISB6.7, ISC8.3, ISL9 and ISX CM2250 engines in Class 6 to 8 trucks. It is filed under the ISX11.9 CM2250 (2010-12) / DTCs group and also applies to ISX12 CM2250 installations, so confirm the engine dataplate before ordering parts. Cross-reference the calibration revision with Cummins official engine support before clearing the code.
Who needs this Cummins fault code 1911 manual
Heavy-duty diesel technicians, fleet maintenance teams and workshop owners diagnosing a most severe rail over-pressure event use this reference to read SPN 157 / FMI 0 correctly and to follow the guided steps in INSITE. The possible causes it lists include:
- a loss of fuel pressure control opening the rail pressure relief valve
- a fuel pump actuator or high-pressure pump fault
- a stuck or worn pressure relief valve
The full 38-page PDF for fuel rail pressure fault code 1911 is available in the DiagTechPro manuals library; a free account is required to download.
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