The Cummins fault code 2878 troubleshooting document is a 6-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering fuel drain valve mechanical fault (SPN 4097, FMI 7). This fault code sets when the aftertreatment fuel drain valve is mechanically not responding properly or is out of adjustment. 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 4097 · Lamp AMBER · FMI 7 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Cummins fault code 2878 overview
This fault code sets when the aftertreatment fuel drain valve is mechanically not responding properly or is out of adjustment. At every start the ECM runs a pressure test through the drain valve, shutoff valve, and injector to detect leaks and mechanical failures. Verify the ECM calibration is correct.
The document lists possible causes including:
- A stuck closed aftertreatment fuel drain valve
- A restricted aftertreatment fuel drain line
- A plugged fuel filter
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 injector sits in the turbocharger outlet flange; the pressure sensor, shutoff valve, and drain valve are in the shutoff valve 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 2878 manual
Fleet technicians and workshop owners diagnosing a stuck aftertreatment fuel drain valve 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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