CAT 3126B Fault Code: 110-11 PID: Flash Code 61 SPN: 110 FMI: 16 High Coolant Temperature Warning

Posted by PerDiezel Solutions on January 12, 2026

The Engine Control Module (ECM) detects the following conditions:

•For C7 engines that are not in emergency vehicles, the engine coolant temperature is at least 108° C (226° F) for more than ten seconds.
•For C7 emergency vehicles and for C9 vehicles, the engine coolant temperature is at least 113° C (235° F) for more than ten seconds.
•For C9 emergency vehicles with automatic transmissions, the engine coolant temperature is at least 118° C (244° F) for more than ten seconds.
•The engine has been running for at least 30 seconds.

Note: This diagnostic code represents an event. This diagnostic code does not represent an electronic system fault.

Probable causes:

1) High ambient air temperature or high inlet air temperature
2) Low coolant level
3) Radiator failure or restiction in cooling system
4) Fault water temperature regulator
5) Faulty coolant temperature sensor or circuit
6) Excessive load

CAT 3126B Fault Code: 110-00 PID: Flash Code 61 SPN: 110 FMI: 15 High Coolant Temperature Warning

CAT 3126B Fault Code: 252-11 PID: Flash Code 59 SPN: 631 FMI: 11 Incorrect Engine Software

CAT 3126B Fault Code: 231-11 PID: Flash Code 58 SPN: 639 FMI: 12 J1939 Data Link Fault

CAT 3126B Fault Code: 231-02 PID: Flash Code 58 SPN: 639 FMI: 2 J1939 Data Incorrect

CAT 3126B Fault Code: 253-14 PID: Flash Code 56 SPN: FMI: Truck Manufacturer Paremater Not Programmed

CAT 3126B Fault Code: 253-02 PID: Flash Code 56 SPN: 630 FMI: 2 Check Customer or System Parameters

WARNING!