This document is a CAT 0110-03 coolant temperature troubleshooting guide covering diagnostic code 27 (voltage high) for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It defines the exact conditions that trigger the fault code, describes the Engine Control Module (ECM) system response, and directs technicians to the correct sensor test procedure.
Official CAT 0110-03 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 (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
- Conditions Which Generate This Code — signal voltage from the engine coolant temperature sensor greater than 4.95 VDC for more than eight seconds, ECM powered for at least two seconds, engine running for more than seven minutes
- System Response — diagnostic code logging, snapshot trigger, check engine lamp behavior (illuminates after ten hours active), default coolant temperature value of 90 °C (194 °F), cooling fan activation after eight seconds
- Test Step 1 — Engine Temperature Sensor Open or Short Circuit Test
Applicable truck models
This troubleshooting page applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP, but the document also covers serial prefix groups 8YS, 5DS, and 1LW. These engines are found in Class 8 heavy-duty trucks from multiple OEMs. For official parts lookup and additional technical resources, visit Caterpillar Support.
Who needs this 0110-03 coolant temperature manual
Fleet mechanics, independent diesel technicians, and workshop owners diagnosing a code 27 (coolant temperature voltage high) on 3406E, C-10, or C-12 engines need this reference. It provides the precise voltage threshold, timing conditions, and the single directed test step required to isolate the fault to an open or short circuit in the temperature sensor wiring.
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