The Cummins fault code 2976 troubleshooting guide is the official Cummins diagnostic procedure for Aftertreatment Diesel Exhaust Fluid Dosing Unit Temperature – Data Erratic, Intermittent, or Incorrect on the ISX11.9 CM2250 engine platform. This 11-page PDF documents the circuit description, the conditions that set and clear the fault, and the guided steps a technician follows to isolate and repair it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 |
| System / Group | Aftertreatment Diesel Exhaust Fluid Dosing Unit Temperature Circuit |
| Fault code | 2976 (SPN 3361, FMI 2) |
| Warning lamp | Amber |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
| Last revised | 21-Dec-2010 |
Cummins fault code 2976 contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and guided troubleshooting steps
Fault meaning and symptoms
The document defines fault code 2976 as Aftertreatment Diesel Exhaust Fluid Dosing Unit Temperature – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel exhaust fluid dosing unit reports its internal temperature to the diesel exhaust fluid controller via the dosing unit signal wire. The diesel exhaust fluid controller communicates this information to the primary engine electronic control module (ECM) via the J1939 data link network. The condition is monitored on SPN 3361, FMI 2, and is annunciated with an amber CHECK ENGINE / malfunction indicator lamp. Documented causes in the Shop Talk section include malfunctioning dosing unit, short circuit to ground in the aftertreatment diesel exhaust fluid dosing unit signal/dosing, unit temperature wire. Each fault is worked with the INSITE electronic service tool, cross-referencing associated procedures 011-058, 019-032, 019-361, 019-071, 019-360.
Applicable truck models
This procedure covers Cummins ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 engines built for the 2010-12 on-highway emissions platform, so it suits Class 8 trucks and vocational chassis running these engines. Confirm the exact application and current calibration against the official Cummins website before ordering parts.
Who needs this Cummins fault code 2976 manual
Diesel technicians and workshop owners who read 2976 on the INSITE service tool use this manual to follow the factory-approved diagnostic tree instead of replacing parts by guesswork. It is equally useful for fleet maintenance staff verifying a repair before returning a truck to service.
The full PDF is available in the DiagTechPro manuals library, a free account is required to download.
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