This document is a CAT C15 fuel temperature troubleshooting guide covering diagnostic code 0174-00 (High Fuel Temperature Warning, severity 65) for Caterpillar on-highway truck engines. It details the exact conditions that generate the code, the system response displayed in Caterpillar Electronic Technician (ET), and the resolution steps. The guide applies to C15 MXS-prefix engines and is published by Caterpillar Inc.
Official CAT C15 fuel temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System / Group | Diagnostic Trouble Codes (DTCs) — SMCS 1439-038-TA; 1922-038 |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0174-00 High Fuel Temperature Warning (65) — Conditions Which Generate This Code
- System Response
- Test Step 1 — No Troubleshooting Required
Applicable truck models
This troubleshooting page applies exclusively to the Caterpillar C15 on-highway truck engine with the MXS serial number prefix (configuration MXS00001-UP). The C15 is a 15.2-liter inline six-cylinder diesel widely used in Class 8 heavy-duty trucks from multiple OEMs. Diagnostic code 0174-00 is triggered when the Engine Control Module (ECM) detects that fuel temperature exceeds 90 °C (194 °F) for more than 30 seconds after the engine has been running for at least three minutes. The system response is a “DIAG” flag displayed next to the Fuel Temperature status in the Caterpillar Electronic Technician (ET) software. Customer passwords are required to clear this code. According to the document, no active troubleshooting procedure is needed — the single test step confirms the result as OK and instructs the technician to stop. For further technical resources and parts information, visit the Caterpillar official support page.
Who needs this CAT C15 fuel temperature manual
Diesel mechanics and workshop owners servicing Caterpillar C15 MXS on-highway engines will find this reference useful when diagnosing a 0174-00 event code. It confirms that the warning is informational and that no repair action is required beyond clearing the code with the correct customer password through Caterpillar ET.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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