This CAT 0174-04 fuel temperature troubleshooting document provides the official Caterpillar procedure for diagnosing diagnostic trouble code 0174-04 (Fuel Temperature voltage low, flash code 13) on 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the code, the system response, and the required test steps to resolve the fault.
Official CAT 0174-04 fuel temperature document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, or 1LW prefix) |
| System/Group | Troubleshooting — DTC 0174-04 Fuel Temperature Sensor Circuit |
| 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
- 0174-04 Fuel Temperature voltage low (13) — SMCS 1922-038
- Conditions Which Generate This Code
- System Response
- Test Step 1: Engine Temperature Sensor Open or Short Circuit Test
Applicable truck models
This troubleshooting sheet 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 procedure also covers serial prefixes 8YS, 5DS, and 1LW. The Engine Control Module (ECM) monitors the fuel temperature sensor signal voltage; when it drops below 0.2 VDC for more than eight seconds, code 0174-04 is logged. During an active fault, Caterpillar Electronic Technician (Cat ET) displays approximately 30 °C (86 °F), and the status screen shows “DIAG.” The engine may experience low power under high fuel temperatures due to loss of fuel temperature power correction. The prescribed repair path directs the technician to perform the Engine Temperature Sensor Open or Short Circuit test. For additional Caterpillar technical resources, visit the Caterpillar official support site.
Who needs this CAT 0174-04 fuel temperature manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing CAT 3406E, C-10, or C-12 powered trucks need this document whenever a 0174-04 fault code appears on Cat ET or on the dashboard status screen. It is essential for anyone performing sensor circuit diagnostics on these engine platforms.
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