fault code 2646 DTCs is the Cummins ISX11.9 CM2250 troubleshooting document for Engine Coolant Temperature – Condition Exists (SPN 110, FMI 31). This 5-page factory guide explains the circuit, the conditions that set the code, and the guided repair steps used with the INSITE electronic service tool. When the engine coolant temperature nears the engine protection limits, the exhaust gas recirculation (EGR) valve will be closed to reduce the coolant temperature.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 2646 (PID P110) |
| SPN / FMI | 110 / 31 |
| Warning lamp | Amber |
| Bulletin number | 2883445 |
| Revision | Last modified 11-Jun-2010 |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
fault code 2646 DTCs table of 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 possible causes
- Associated procedures table
- Guided troubleshooting steps
Applicable truck models
This troubleshooting procedure applies to Cummins ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 engines. The engine coolant temperature sensor is located on the thermostat housing. The document states the code is set when fault code is set active when the egr valve is closed to reduce engine coolant temperature. When the code is active, the amber warning lamp is illuminated when this diagnostic runs and fails. Full specifications and procedure references are published by Cummins on the Cummins official website.
Who needs this fault code 2646 DTCs manual
Diesel technicians and workshop owners diagnosing Condition Exists on ISX11.9 CM2250 engines need this reference. The guide walks through each guided step and the INSITE electronic service tool tests required to validate the repair and clear the code. Each guided step lists the keyswitch position, the required action, and the YES or NO branch that follows. The associated procedures table cross-references the component repair bulletins for the ISX11.9 and ISX15 CM2250 platforms. Following the steps in the documented order helps confirm the root cause before any parts are replaced.
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