Cummins fault code 2551 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Injector Metering Rail 2 Pressure condition (PID P129, SPN 1349, FMI 0/16, Red lamp). This 3-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 2551 overview
Cummins defines this code as “INJECTOR METERING RAIL 2 PRESSURE – DATA VALID BUT ABOVENORMAL OPERATING RANGE – MODERATELY SEVERE LEVEL” on the Rear Fueling Actuator Circuit. The electronic control module (ECM) supplies voltage to open the rear fueling actuator for a short length of time. This allows a short pulse of fuel to flow to the injector. The injector then injects the fuel into the cylinder for combustion.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Rear Fueling Actuator Circuit — ISM CM871 fault codes |
| Fault code | 2551 (SPN 1349, FMI 0/16) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 3 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 2551. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this fault code 2551 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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