This Cummins fault 2789 document is a troubleshooting PDF for Engine Coolant Temperature data valid but below normal operating range. It explains the coolant temperature sensor circuit, fault conditions, INSITE™ checks, ECM calibration review, clearing steps, and repair direction for Code 2789.
Official Cummins fault 2789 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250; file group lists ISB6.7 CM2250 (2010-12) / DTCs |
| System/Group | Coolant Temperature Sensor Circuit; DTCs; Engine Coolant Temperature – Data Valid But Below Normal Operational Range – Moderately Severe Level |
| Publication no. | Associated bulletin numbers shown: 4022250 and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 30-Dec-2010 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 2789
- 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 1A – Check for active fault codes.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
The extracted procedure applies to Cummins CM2250 engine coverage shown in the document, including ISX11.9 CM2250, ISX15 CM2250, and GX CM2250 entries in the associated procedures table. The file classification also lists ISB6.7 CM2250 (2010-12) / DTCs, but the visible procedure text identifies the coolant temperature sensor circuit for ISX11.9 CM2250 and ISX15 CM2250 and references procedure 019-019 for the Engine Coolant Temperature Sensor and procedure 019-032 for ECM Calibration Code. The fault is SPN 110, FMI 18, PID P110, with an amber lamp and no stated performance effect. The diagnostic runs continuously when the engine is running, and the setting condition shown is engine coolant temperature below 60°C [140°F] for over 1 hour during extended idle. Official manufacturer information is available from Cummins official website.
Who needs this Cummins fault 2789 manual
This Cummins fault 2789 manual is useful for diesel mechanics, fleet workshops, and diagnostic technicians checking a low coolant temperature fault with INSITE™ electronic service tool. It supports comparison of the ECM coolant temperature value against a known value or mechanical gauge, replacement direction for the coolant temperature sensor when readings do not correlate, and calibration update review before disabling and clearing the fault code.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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