This document is a CAT 0102-00 excessive boost pressure troubleshooting guide for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It defines the conditions that generate diagnostic trouble code 0102-00, explains the ECM system response, and provides the step-by-step test procedure to identify the root cause of excessive boost pressure.
Official CAT 0102-00 excessive boost pressure 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 | DTCs — SMCS 1917-038 (Turbocharger / Boost Pressure) |
| 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
- 0102-00 Excessive Boost Pressure — Conditions Which Generate This Code
- System Response — Boost pressure set to 0 kPa (0 psi), DIAG status on Cat ET
- Test Step 1 — Determine the cause of excessive boost pressure (wastegate failure, pinched wastegate line)
Applicable truck models
This troubleshooting page applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families, specifically configurations with serial prefixes 8YS, 9NS, 5DS, or 1LW. The document references the C-12 Truck Engine 9NS00001-UP configuration. These engines are found in Class 8 on-highway trucks from multiple OEMs. The ECM monitors actual versus desired boost pressure and triggers DTC 0102-00 when actual boost exceeds the target. When the code is active, the ECM sets boost pressure to 0 kPa (0 psi) and the engine may experience low power. The primary diagnostic step directs the technician to inspect the turbocharger wastegate for mechanical failure and to check for a pinched wastegate control line. The status “DIAG” appears next to “Boost Pressure” in the Caterpillar Electronic Technician (Cat ET) service tool. For additional technical resources and parts information, visit Caterpillar’s official support page.
Who needs this CAT 0102-00 excessive boost pressure manual
Fleet mechanics and independent workshop owners diagnosing low-power complaints or active DTC 0102-00 on 3406E, C-10, or C-12 engines will find this guide essential. It is also useful for technicians using Cat ET who need to confirm proper wastegate function and boost-pressure sensor readings.
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