This Code 2659 DTCs document explains an engine coolant temperature condition on Cummins ISB6.7 CM2150 applications and the related EGR valve response. It identifies the code as an information fault code, showing that the EGR valve closed to reduce coolant temperature, with no repair required when the condition is inactive.
Official Code 2659 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL engine coolant temperature circuit information. |
| System/Group | DTCs; Engine Coolant Temperature Circuit; EGR valve actuation |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-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 2659
- 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 – Clear the fault code.
Applicable truck models
This PDF applies to Cummins ISB6.7 CM2150 (2007-09) engine diagnostic coverage in the DTC group. The extract also names ISB, ISC, and ISL in relation to the Engine Coolant Temperature Circuit, but it does not list truck makes, chassis models, VIN ranges, or vehicle platforms. For manufacturer information, visit Cummins official website.
Who needs this Code 2659 DTCs manual
Mechanics, fleet technicians, and workshop owners use this manual when INSITE™ shows Fault Code 2659, PID P110, SPN 110, FMI 31. The procedure helps confirm whether the code is active, inactive, or ready to clear after EGR valve actuation is re-activated.
The diagnostic notes state that the engine coolant temperature sensor is located on the thermostat housing and that the diagnostic runs continuously when engine speed is greater than 500 rpm. The code sets active when the EGR valve is closed to reduce engine coolant temperature. The document also directs technicians to verify ECM calibration, check QuickServe® Online calibration revision history, and recalibrate the ECM if applicable under the referenced service procedure.
The troubleshooting flow uses the INSITE™ electronic service tool with the keyswitch ON. Step 1 checks active fault codes, Step 2 verifies that the fault code is inactive, and Step 2B clears inactive fault codes. If all steps have been completed and checked again, the document instructs the technician to return to the troubleshooting steps or contact a Cummins™ Authorized Repair Location.
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