This 1-page PDF is a CAT key switch fault diagnostic reference covering DTC 0043-02 for Caterpillar C11, C13, and C15 engines. It provides fault code details, conditions for triggering the code, and recommended troubleshooting steps for technicians working on CAT-powered trucks and equipment.
Official CAT key switch fault document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Publication no. | 0043-02 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- DTC 0043-02 Key Switch Fault — Description and conditions
- Diagnostic procedure and troubleshooting steps
- Key switch circuit inspection
- ECM signal verification
Applicable truck models
This document applies to Caterpillar C11, C13, and C15 diesel engines grouped under the “All Others” category. These engines are commonly installed in on-highway Class 8 trucks and vocational vehicles from manufacturers such as Peterbilt, Kenworth, and Western Star, as well as various off-highway and industrial applications. The DTC 0043-02 relates to the key switch input signal received by the engine ECM, and the procedure is relevant across all equipment using these CAT engine platforms. For official Caterpillar parts lookup and additional service documentation, visit Caterpillar Support and Service Resources.
Who needs this key switch fault manual
Diesel mechanics, fleet maintenance technicians, and independent workshop owners troubleshooting a key switch fault code on CAT C11, C13, or C15 engines will benefit from this document. It is essential for anyone diagnosing DTC 0043-02 to verify key switch circuit integrity and ECM communication before replacing components.
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