This Cummins 2451 fault code document is a troubleshooting PDF for turbocharger turbine inlet temperature on Cummins CM2250 engines. It explains the circuit description, fault logic, INSITE™ snapshot checks, air handling inspections, turbocharger checks, EGR leak checks, ECM calibration review, and fault clearing steps.
Official Cummins 2451 fault code document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISM11 CM876 SN in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | Not specified in the extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, and 4022196 |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 12 |
| 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 air handling system.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins electronic control module diagnostics for the ISB6.7 CM2250 group and includes associated procedure references for ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and ISM11 CM876 SN engines. The fault is listed as Fault Code 2451, PID S384, SPN 2789, FMI 16, for turbocharger turbine intake temperature data valid but above normal operating range. For current manufacturer information, visit Cummins official website.
Who needs this Cummins 2451 fault code manual
This manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing high calculated turbine inlet temperature, low boost pressure causes, turbocharger fuel control derate, or EGR system leaks. It supports shop work with INSITE™ electronic service tool checks and guided repair decisions.
The diagnostic section states that the ECM calculates exhaust gas temperature from operating conditions such as intake manifold air temperature, engine speed, injection timing, intake manifold pressure, and fuel flow. It also notes that there is no physical exhaust gas temperature sensor for this value, and OEM pyrometer gauges may not match the INSITE™ monitored parameter. The Cummins 2451 fault code is logged when calculated turbine inlet temperature exceeds a calibratible engine protection threshold, with fuel limited to reduce exhaust temperature entering the turbocharger.
The troubleshooting path starts by checking active Fault Code 2634, 2449, or 2387, inactive Fault Code 2973, and the Fault Code 2451 snapshot data. It then reviews Engine Operating State, Turbocharger Compressor Inlet Temperature, Turbocharger Compressor Outlet Temperature (Calculated), and Exhaust Gas Temperature (Calculated). Later steps inspect the charge-air cooler, clamps, hoses, piping, turbocharger compressor and turbine blades, EGR connection tubing, and the air intake sealing surface between the air filter and hood air plenum.
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