This Cummins fault 2646 troubleshooting document explains Fault Code 2646 for engine coolant temperature and EGR valve response on CM2250 engines. It identifies the code as an information fault, lists the amber CHECK ENGINE lamp effect, and outlines INSITE™ checks, ECM calibration review, and fault clearing steps.
Official Cummins fault 2646 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and GX CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Coolant Temperature Circuit |
| Publication no. | Not specified; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last Modified: 11-Jun-2010 and 30-Dec-2010 |
| Pages | 5 |
| 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
- FAULT CODE 2646 – Engine Coolant Temperature – Condition Exists
- 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.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This file applies to Cummins CM2250 engine service information where Fault Code 2646, PID P110, SPN 110, FMI 31 is used for Engine Coolant Temperature – Condition Exists. The extract specifically names ISB6.7 CM2250, ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, and GX CM2250; it does not list truck makes or chassis models. The engine coolant temperature sensor location is given as the thermostat housing, and the diagnostic runs continuously when engine speed is greater than 500 rpm. See the manufacturer’s official site at Cummins.
Who needs this Cummins fault 2646 troubleshooting manual
Workshop owners, diesel technicians, and fleet mechanics need this fault 2646 troubleshooting manual when INSITE™ shows Fault Code 2646 active or inactive. The procedure helps confirm that the EGR valve closed to reduce coolant temperature, check whether an ECM calibration update is available, and clear the code after the required key cycle and validation conditions.
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