CAT 3126E Fault Code: 111-11 PID: Flash Code 62 SPN: 111 FMI: 18 Low Coolant Level 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 111° C (232° F) for more than four seconds.
•For C7 emergency vehicles and for C9 vehicles, the engine coolant temperature is at least 116° C (241° F) for more than four seconds.
•For C9 emergency vehicles with automatic transmissions, the engine coolant temperature is at least 121° C (250° F) for more than four seconds.
•The engine has been running more than 30 seconds.

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

Possible Causes:

1) Low Coolant level
2) Wiring at either ther coolant level sensor, ECM, or in between
3) ECM Failure

CAT 3126E Fault Code: 111-01 PID: Flash Code 62 SPN: 111 FMI: 17 Low Coolant Level Warning

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

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

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

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

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

WARNING!