This CAT 0110-04 coolant temperature troubleshooting guide covers diagnostic code 0110-04 (Coolant Temperature voltage low, flash code 27) for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the code, the ECM system response, and the required diagnostic test procedure.
Official CAT 0110-04 coolant temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System/Group | Troubleshooting / Diagnostic Trouble Codes (DTCs) — SMCS 1906-038 |
| Publication no. | RENR1328-08 |
| Year/Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0110-04 Coolant Temperature voltage low (27) — overview
- Conditions Which Generate This Code
- System Response
- Test Step 1: Engine Temperature Sensor Open or Short Circuit – Test
Applicable truck models
This document applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families used in on-highway applications. Specific engine configurations referenced are 8YS, 9NS, 5DS, and 1LW prefix serial numbers. The product line is listed as Truck Engine, with the C-12 9NS configuration called out explicitly. Workshop staff working on any of these CAT powertrains should reference this guide when diagnostic code 0110-04 is logged. For additional product support and parts information, visit Caterpillar’s official support page.
Who needs this 0110-04 coolant temperature manual
Diesel mechanics and workshop owners servicing Caterpillar 3406E, C-10, or C-12 engines will use this document whenever the ECM logs code 0110-04 — indicating the engine coolant temperature sensor signal voltage has dropped below 0.2 VDC for more than eight seconds. The guide explains that the ECM defaults to 90 °C (194 °F) for coolant temperature and activates the cooling fan automatically, then directs the technician to perform the Engine Temperature Sensor Open or Short Circuit test to resolve the fault.
The full PDF of this 0110-04 coolant temperature troubleshooting guide is available in the DiagTechPro manuals library; a free account is required to download.
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