This 1-page diagnostic guide addresses the CAT C15 auxiliary output DTC coded 0055-05, covering the Auxiliary Output #07 current low fault on Caterpillar C11, C13, and C15 engines. It provides troubleshooting steps and circuit checks for technicians dealing with this specific diagnostic trouble code in heavy-duty truck applications.
Official CAT C15 auxiliary output DTC document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | DTCs — Auxiliary Output #07 current low |
| Publication no. | 0055-05 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- DTC 0055-05 — Auxiliary Output #07 Current Low
- Conditions for setting the fault code
- Circuit inspection and wiring checks
- Recommended corrective actions
Applicable truck models
This document applies to Caterpillar diesel engines in the C11, C13, and C15 families, grouped under the “All Others” designation. 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 0055-05 fault relates specifically to low current on Auxiliary Output #07, a condition that can affect engine-driven accessories or aftertreatment components controlled by the ECM. For official Caterpillar parts lookup and additional technical literature, visit Caterpillar Support & Service.
Who needs this C15 auxiliary output DTC manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing Caterpillar-powered trucks will benefit from this reference when diagnosing a current-low condition on Auxiliary Output #07. It is especially useful when a CAT diagnostic tool flags code 0055-05 and the technician needs step-by-step electrical troubleshooting guidance.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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