This single-page diagnostic document covers the CAT C15 barometric pressure fault code 0108-03 (Barometric Pressure voltage high) for Caterpillar heavy-duty diesel engines. It provides the structured troubleshooting procedure technicians need to diagnose and resolve high-voltage conditions at the barometric pressure sensor circuit.
Official CAT C15 barometric pressure document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Publication no. | 0108-03 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | PDF (compressed) |
| Language | English |
Document table of contents
- DTC 0108-03 — Barometric Pressure Voltage High
- Conditions for setting the fault code
- Circuit description and sensor voltage thresholds
- Step-by-step diagnostic procedure
- Expected repair outcomes and code clearing
Applicable truck models
This diagnostic guide applies to all Caterpillar C11, C13, and C15 diesel engines classified under the “All Others” coverage group. These engines are widely installed in Class 8 on-highway trucks and vocational vehicles from manufacturers such as Peterbilt, Kenworth, and Western Star. The DTC 0108-03 procedure addresses barometric pressure sensor circuits common across these engine platforms. For official Caterpillar service information and parts lookup, visit Caterpillar Support and Service.
Who needs this C15 barometric pressure manual
Diesel technicians and workshop owners troubleshooting a voltage-high condition on the barometric pressure sensor in CAT C11, C13, or C15 engines will find this document essential. It is particularly useful for shops using Caterpillar ET (Electronic Technician) software that have logged DTC 0108-03 and need the factory-prescribed diagnostic steps to confirm wiring integrity, sensor function, and ECM input status before replacing components.
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