This document is an official CAT C12 boost pressure troubleshooting procedure for diagnostic trouble code 0102-03 (Boost Pressure Voltage High, FMI 03). Published by Caterpillar, it explains the conditions that generate code PID 0102 FMI 03, the ECM system response and default behavior, possible performance effects, and the step-by-step diagnostic test required to resolve the fault on 3406E, C-10, and C-12 on-highway truck engines.
Official CAT C12 boost pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS; also applicable to 3406E, C-10, and C-12 (8YS, 9NS, 5DS, 1LW) |
| System / Group | Engine Pressure Sensor — Boost Pressure Diagnostics (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
- Conditions Which Generate This Code (PID 0102 FMI 03 — signal voltage greater than 4.95 VDC for more than two seconds)
- System Response (ECM logs code, triggers snapshot, illuminates check engine lamp, defaults boost pressure to 100 kPa / 14.5 psi)
- Possible Performance Effect (low engine power while code is active)
- Troubleshooting — Test Step 1: Engine Pressure Sensor Open or Short Circuit Test
Applicable truck models
This troubleshooting bulletin applies to Caterpillar on-highway truck engines in the following configurations: 3406E, C-10, and C-12 with serial prefix groups 8YS, 9NS, 5DS, and 1LW. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP. These engines are widely installed in Class 8 heavy-duty trucks used for long-haul and vocational applications. For additional product support and serial-number lookups, visit Caterpillar’s official support page.
Who needs this CAT C12 boost pressure manual
Diesel mechanics and workshop owners diagnosing a check engine lamp with DTC 0102-03 on 3406E, C-10, or C-12 engines will find this guide essential. It provides the exact ECM trigger conditions, default values used during the fault, and directs the technician to the correct pressure-sensor circuit test to isolate an open or short circuit.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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