This document is a CAT 0110-11 coolant temperature troubleshooting guide covering diagnostic code 61 (Very High Coolant Temperature) for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It defines the ECM-detected conditions that trigger the code, describes the system response including engine derate and speed limiting, and provides a test step referencing the cooling system inspection procedure.
Official CAT 0110-11 coolant temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW prefixes) |
| System / Group | DTCs — SMCS 1906-038 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code (DTC 0110-11, code 61)
- System Response — check engine lamp, warning lamp, derate behavior, shutdown logic
- Test Step 1: Check the Cooling System
Applicable truck models
This troubleshooting document applies to Caterpillar on-highway truck engines in the following configurations: the 3406E (coolant threshold 111 °C / 232 °F), the C-10 and C-12 (coolant threshold 106 °C / 223 °F). Specific serial-number prefixes covered are 8YS, 9NS, 5DS, and 1LW. The extract references configuration C-12 Truck Engine 9NS00001-UP as an example. These engines are installed in a wide range of Class 8 trucks from various OEMs. For official parts lookup and service information, visit Caterpillar Support & Service.
Who needs this CAT 0110-11 coolant temperature manual
Mechanics and workshop owners diagnosing a flashing check engine lamp tied to DTC 0110-11 (code 61) on 3406E, C-10, or C-12 powered trucks will find this guide essential. It is also required when the ECM derates the engine to the default torque map and limits vehicle speed to 72 km/h (45 mph) due to very high coolant temperature.
Key technical details in this guide include: the ECM triggers code 61 when engine coolant temperature exceeds 106 °C (223 °F) on C-10/C-12 engines or 111 °C (232 °F) on the 3406E, provided the engine has been running for at least 30 seconds. The system response illuminates the check engine lamp and warning lamp — or, if installed, the high coolant temperature lamp replaces the warning lamp. When the Engine Monitoring parameter is set to “Shutdown,” the engine shuts down after 20 seconds of active code. When set to “Warning,” engine power is not affected. Customer passwords are required to clear this diagnostic code via Caterpillar Electronic Technician (Cat ET), where “DIAG” appears next to Engine Coolant Temperature status. The single test step directs the technician to refer to Testing and Adjusting, “Testing the Cooling System.”
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