The Cummins fault code 2774 troubleshooting document is a 3-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering EGR differential pressure system (SPN 3058, FMI 11/31). This fault code sets when the exhaust gas recirculation (EGR) system condition exists because the EGR differential pressure tubes are plugged. This page summarises what the manual contains so a technician can confirm it matches the code before downloading.
Official document details
| Brand | Cummins |
| Model coverage | ISM & ISX CM871 (2007-09) |
| System / group | ISM CM871 (2007-09) / DTCs |
| Circuit | ISX and ISM EGR Differential Pressure Sensor Circuit |
| Fault identifiers | SPN 3058 · Lamp AMBER · FMI 11/31 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 3 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Cummins fault code 2774 overview
This fault code sets when the exhaust gas recirculation (EGR) system condition exists because the EGR differential pressure tubes are plugged. The sensor measures the pressure drop across the EGR differential pressure orifice, which the ECM uses to calculate EGR flow into the intake manifold. Verify the ECM calibration is correct.
The document lists possible causes including:
- A plugged or leaking low or high EGR differential pressure tube
- Carbon buildup inside the EGR venturi tube blocking the differential pressure ports
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models covered
This procedure applies to Cummins ISM and ISX engines built on the CM871 (2007-09) electronic control platform, as fitted by truck makers using this Cummins driveline. The EGR differential pressure sensor is near the fuel inlet of the integrated fuel system module, with high and low tubes from the differential pressure orifice. For wiring, connector, and CPL detail, refer to the Cummins official engine support site or the OEM service manual.
Who needs this Cummins fault code 2774 manual
Fleet technicians and workshop owners diagnosing a plugged EGR differential pressure circuit on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the EGR differential pressure circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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