This single-page diagnostic document addresses the CAT C15 coolant temperature DTC (Diagnostic Trouble Code) 0110-03, specifically the condition where the engine coolant temperature sensor circuit registers voltage high on Caterpillar diesel engines. It provides technicians with the structured troubleshooting steps needed to identify and resolve the fault in C11, C13, and C15 engine platforms.
Official CAT C15 coolant temperature DTC document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Publication no. | 0110-03 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | PDF (compressed) |
| Language | English |
Document table of contents
- DTC 0110-03 — Coolant Temperature Sensor Circuit Voltage High
- Conditions for setting the code
- Diagnostic steps and sensor circuit inspection
- Voltage measurement and signal verification
- Recommended corrective actions
Applicable truck models
This guide applies to all Caterpillar on-highway and vocational trucks and equipment powered by C11, C13, and C15 diesel engines in the “All Others” configuration group. These engine families are widely installed in Class 8 trucks from manufacturers such as Kenworth, Peterbilt, and Western Star, as well as various industrial and power-generation applications. Workshops encountering DTC 0110-03 on any of these platforms will find the procedure relevant. For official Caterpillar parts lookup and additional technical resources, visit Caterpillar Support and Service.
Who needs this C15 coolant temperature DTC manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing Caterpillar C11, C13, or C15 engines will benefit from this reference when diagnosing a voltage-high condition on the engine coolant temperature sensor circuit. It is especially useful for shops that lack a CAT Electronic Technician (ET) subscription and need a quick procedural reference for code 0110-03.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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