This 2-page troubleshooting guide covers the C12 boost pressure DTCs diagnostic code 0102-04 (PID 0102 FMI 04) for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the code, the system response, possible performance effects, and the recommended diagnostic procedure to resolve the fault.
Official C12 boost pressure DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engine (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Diagnostic Trouble Codes — SMCS 1917-038 |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0102-04 Boost Pressure voltage low (25) — overview and SMCS code
- Conditions Which Generate This Code — ECM signal voltage threshold and timing
- System Response — diagnostic code logging, snapshot trigger, check engine lamp behavior, default boost pressure value
- Possible Performance Effect — low power condition
- Troubleshooting: Test Step 1 — Engine Pressure Sensor Open or Short Circuit Test
Applicable truck models
This document applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families, specifically the C-12 Truck Engine 9NS (9NS00001-UP) configuration. It also covers serial prefix groups 8YS, 5DS, and 1LW. These engines are found in Class 8 heavy-duty trucks from multiple OEMs. For official Caterpillar parts and service information, visit Caterpillar Support.
Who needs this boost pressure DTCs manual
Diesel mechanics and workshop owners diagnosing a check engine lamp caused by DTC 0102-04 on 3406E, C-10, or C-12 engines need this document. It provides the exact ECM detection logic — signal voltage below 0.2 VDC for more than one second — along with the default boost pressure value of 100 kPa (14.5 psi) the ECM substitutes, and directs technicians to the correct pressure sensor test procedure using Caterpillar Electronic Technician (ET).
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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