Cummins fault code 2646 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Engine Coolant Temperature condition (PID P110, SPN 110, FMI 31, Amber lamp). This 2-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 2646 overview
Cummins defines this code as “ENGINE COOLANT TEMPERATURE – CONDITION EXISTS” on the Engine Coolant Temperature Circuit. When the engine coolant temperature nears the engine protection limits, the exhaust gas recirculation (EGR) valve will be closed to reduce the coolant temperature. This fault code is used as an information fault code, only indicating that the EGR valve has closed.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Engine Coolant Temperature Circuit — ISM CM871 fault codes |
| Fault code | 2646 (SPN 110, FMI 31) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 2646. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this fault code 2646 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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