This CAT 3406E coolant temperature troubleshooting document provides the official Caterpillar diagnostic procedure for fault code 0110-00 High Coolant Temperature Warning (61). It covers the conditions that generate this code on 3406E, C-10, and C-12 on-highway truck engines, the system response, and the step-by-step resolution procedure.
Official CAT 3406E coolant temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Diagnostic Trouble Codes — 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
- 0110-00 High Coolant Temperature Warning (61) — Conditions Which Generate This Code
- System Response — Check Engine Lamp, Warning Lamp, and High Coolant Temperature Lamp behavior
- Customer Password Requirements for clearing the diagnostic code
- Test Step 1: Check the Cooling System — reference to Testing and Adjusting, “Testing the Cooling System”
Applicable truck models
This document applies to Caterpillar on-highway truck engines in three families: the 3406E, the C-10, and the C-12 (specifically the C-12 9NS configuration 9NS00001-UP). The ECM triggers fault code 0110-00 when engine coolant temperature exceeds 103 °C (217 °F) on C-10 or C-12 engines, or 108 °C (226 °F) on the 3406E, after the engine has been running for at least 30 seconds. The “DIAG” status appears next to Engine Coolant Temperature on the Caterpillar Electronic Technician (Cat ET) diagnostic tool. For additional Caterpillar technical resources, visit Caterpillar Official Support.
Who needs this 3406E coolant temperature manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing Caterpillar 3406E, C-10, or C-12 powered trucks need this guide when the check engine lamp illuminates due to an overheating condition. It is essential for anyone diagnosing DTC 0110-00 with Cat ET and performing cooling system inspections per Caterpillar’s prescribed test procedure.
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