This CAT 0108-04 barometric pressure troubleshooting document covers the diagnostic procedure for fault code 0108-04 (FMI 04, flash code 26) on Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It explains the conditions that generate the code, the ECM system response, possible performance effects, and the required test steps to resolve the issue. The publication is part of the official Caterpillar troubleshooting literature under media number RENR1328-08.
Official CAT 0108-04 barometric pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 On-highway Truck Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Engine Pressure Sensor — SMCS 1923-038 |
| 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 — signal voltage from the atmospheric pressure sensor below 0.2 VDC for more than 30 seconds
- System Response — ECM defaults to 100 kPa (15 psi); “DIAG” displayed on Caterpillar Electronic Technician (ET)
- Possible Performance Effect — low engine power while the code is active
- Troubleshooting Test Step 1 — “Engine Pressure Sensor Open or Short Circuit – Test”
Applicable truck models
This troubleshooting guide applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families used in on-highway applications. The specific configuration referenced in the document is the C-12 Truck Engine 9NS00001-UP, but the procedure also covers engine prefixes 8YS, 5DS, and 1LW. The diagnostic code PID 0108 FMI 04 is triggered when the Engine Control Module detects that the atmospheric pressure sensor signal voltage drops below 0.2 VDC while the ECM has been powered for at least two seconds and the engine is either not running or has been running for more than ten seconds. For additional product support information, visit Caterpillar Official Support.
Who needs this CAT 0108-04 barometric pressure manual
Diesel mechanics and workshop owners servicing Caterpillar 3406E, C-10, or C-12 engines will need this document when diagnosing a low-power complaint accompanied by active fault code 26. It is essential for anyone using Caterpillar Electronic Technician (ET) software to interpret the “DIAG” status flag on atmospheric pressure readings and perform the Engine Pressure Sensor Open or Short Circuit test.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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