This CAT 0108-03 barometric pressure troubleshooting document provides the official Caterpillar diagnostic procedure for fault code PID 0108 FMI 03 — barometric pressure voltage high (code 26) — on 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the code, the ECM system response, possible performance effects, and the required test steps to resolve the fault.
Official CAT 0108-03 barometric pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW configurations) |
| System / Group | Diagnostic Trouble Codes (DTCs) — SMCS 1923-038 |
| 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
- Conditions Which Generate This Code — signal voltage from the atmospheric pressure sensor greater than 4.9 VDC for more than 30 seconds
- System Response — ECM defaults to 100 kPa (15 psi); “DIAG” status displayed in Caterpillar Electronic Technician (ET)
- Possible Performance Effect — engine may experience low power while the code is active
- Troubleshooting Test Step 1 — perform “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. Specific configurations referenced include C-12 Truck Engine 9NS00001-UP, along with prefix groups 8YS, 9NS, 5DS, and 1LW. The fault code relates to the atmospheric pressure sensor circuit monitored by the Engine Control Module (ECM). For additional product and support information, visit the Caterpillar official support page.
Who needs this 0108-03 barometric pressure manual
Diesel mechanics and workshop owners working on CAT 3406E, C-10, or C-12 truck engines who encounter DTC code 26 (PID 0108 FMI 03) need this reference. It is essential for anyone diagnosing a high-voltage condition on the atmospheric pressure sensor circuit and resolving the resulting low-power derate.
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