This Cummins 2976 fault code document is a troubleshooting PDF for an aftertreatment diesel exhaust fluid dosing unit temperature fault. It explains Fault Code 2976, SPN 3361 FMI 2, the amber lamp response, disabled diesel exhaust fluid injection, and the guided checks used to isolate wiring, connector, dosing unit, or ECM calibration causes.
Official Cummins 2976 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; ISC8.3 and ISL9 CM2250; ISX15 CM2250; ISX11.9 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid dosing unit temperature circuit |
| Publication no. | 4022254; 4022257; 4022250; 2883445 |
| Year/Revision | Last Modified: 21-Dec-2010; troubleshooting section Last Modified: 13-Dec-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the aftertreatment diesel exhaust fluid dosing unit and harness.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract applies to Cummins CM2250 engines listed in the procedure tables: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250. The component location is OEM dependent, so the document directs technicians to the OEM service manual for the aftertreatment diesel exhaust fluid dosing unit location and connector identification. The fault concerns the dosing unit signal or temperature wire, the diesel exhaust fluid controller, and communication of dosing unit internal temperature to the primary engine ECM over the J1939 data link network. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2976 fault code manual
This 2976 fault code manual is for diesel mechanics, diagnostic technicians, and workshop owners working on SCR aftertreatment faults where DEF injection is disabled. It is useful when INSITE™ electronic service tool shows Fault Code 2976 active and the technician must inspect connectors, measure harness resistance, check for pin-to-pin shorts, check for pin-to-ground shorts, verify ECM calibration, and validate clearing conditions.
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