This document is a CAT 0174-00 fuel temperature warning troubleshooting guide for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It defines the exact conditions under which the Engine Control Module (ECM) generates diagnostic code 0174-00 and explains the system response displayed on the Caterpillar Electronic Technician (ET) tool. The guide confirms that no troubleshooting action is required when this code appears.
Official CAT 0174-00 fuel temperature warning document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS; 3406E, C-10 and C-12 On-highway Engines (8YS, 9NS, 5DS, or 1LW) |
| System / Group | Diagnostic Trouble Codes (DTCs) — SMCS 1922-038 |
| 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
- 0174-00 High Fuel Temperature Warning (65) — Overview
- Conditions Which Generate This Code
- System Response
- Test Step 1 — No Troubleshooting Required
Applicable truck models
This troubleshooting page applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families used in on-highway applications. Specific engine serial number prefixes covered are 8YS, 9NS, 5DS, and 1LW. The configuration listed in the document is the C-12 Truck Engine 9NS00001-UP. Workshops servicing any of these powertrains should reference this guide when diagnostic code 0174-00 appears. For additional technical resources, visit the Caterpillar official support page.
Who needs this 0174-00 fuel temperature warning manual
Diesel mechanics and workshop owners working on Caterpillar 3406E, C-10, or C-12 truck engines need this document when the ECM logs a 0174-00 code indicating fuel temperature above 90 °C (194 °F) for more than 30 seconds after the engine has been running for at least three minutes. The guide clarifies that the “DIAG” indicator appears next to “Fuel Temperature” status on the Caterpillar Electronic Technician (ET), that customer passwords are required to clear the code, and that no further troubleshooting steps are necessary.
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