The Cummins fault code 2881 troubleshooting document is a 3-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering aftertreatment fuel pressure sensor (SPN 3480, FMI 1/17). This fault code sets when the aftertreatment fuel pressure sensor reads below its normal operating range at the least severe level. 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 Aftertreatment Fuel Injector System |
| Fault identifiers | SPN 3480 · FMI 1/17 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 2881 overview
This fault code sets when the aftertreatment fuel pressure sensor reads below its normal operating range at the least severe level. The sensor monitors fuel pressure into the aftertreatment system on a 5-volt reference; low fuel pressure produces a low signal voltage. Verify the ECM calibration is correct and inspect the fuel supply.
The document lists possible causes including:
- Low fuel pressure detected in the aftertreatment fuel supply system
- On ISM engines, a plastic plug or “stringer” restricting the fuel rifle in the cylinder head
- A restricted aftertreatment fuel supply line
- Progressive aftertreatment damage that must be inspected after repair
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 aftertreatment fuel pressure sensor is located in the aftertreatment fuel shutoff manifold. 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 2881 manual
Fleet technicians and workshop owners diagnosing low aftertreatment fuel pressure on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the aftertreatment fuel system circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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