fault code 559 DTCs is the Cummins ISX11.9 CM2250 diagnostic document for the injector metering rail 1 pressure control loop, logged as SPN 157, FMI 18 with a amber lamp. The engine may be hard to start or low on power, and in some cases may not start. The ECM monitors rail fuel pressure and adjusts the fuel pump actuator to hold commanded pressure; the code sets when measured injector metering rail 1 pressure is lower than commanded. The document opens with a fault code path that routes ISB, ISC/ISL and ISX engines to separate procedures. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
fault code 559 DTCs document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Injector Metering Rail 1 Pressure Circuit — DTCs |
| Fault code / SPN / FMI | 559 / SPN 157 / FMI 18 |
| PID / Lamp | Not listed / Amber |
| Year / Revision | Last modified 23-Oct-2009 |
| Pages | 53 |
| File size | 0.8 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the injector metering rail 1 pressure wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this fault code 559 DTCs manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a injector metering rail 1 pressure concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (53 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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