The Cummins fault code 2728 troubleshooting document is a 4-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering aftertreatment fuel injector 1 (SPN 382, FMI 0/16). This fault code is activated when the aftertreatment fuel injector 1 is injecting excessive fuel to try to meet the target temperature at the diesel oxidation catalyst outlet, at a moderately 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 System |
| Fault identifiers | SPN 382 · FMI 0/16 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 4 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Cummins fault code 2728 overview
This fault code is activated when the aftertreatment fuel injector 1 is injecting excessive fuel to try to meet the target temperature at the diesel oxidation catalyst outlet, at a moderately severe level. Three temperature sensors monitor the catalyst and diesel particulate filter during regeneration. Verify the ECM calibration is correct.
The document lists possible causes including:
- Soot plugging the front face of the diesel oxidation catalyst
- Engine oil or fuel contamination of the diesel oxidation catalyst
- A cracked or contaminated diesel oxidation catalyst
- A malfunction in the aftertreatment fuel injection system or an exhaust leak
- A duty cycle too low to reach adequate exhaust temperatures
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 diesel oxidation catalyst is in the exhaust; its location varies by OEM. 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 2728 manual
Fleet technicians and workshop owners diagnosing excessive aftertreatment fuel injection on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the diesel particulate filter circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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