This document is a CAT C10 0051-05 troubleshooting guide for diagnostic trouble code 0051-05 (Auxiliary Output #03 current low, flash code 67). It provides the conditions that generate this fault code, the ECM system response, and the required test procedure to resolve the issue on 3406E, C-10, and C-12 on-highway truck engines.
CAT C10 0051-05: Official CAT C10 0051-05 troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS (9NS00001-UP); also applicable to 3406E, C-10, and C-12 on-highway engines (8YS, 9NS, 5DS, 1LW configurations) |
| System / Group | DTCs — SMCS 1901-038 (Auxiliary Output) |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
CAT C10 0051-05: Document table of contents
- Conditions Which Generate This Code (DTC 0051-05, flash code 67)
- System Response — ECM behavior and Eaton Top 2 mode disable
- Test Step 1: Eaton Top 2 Transmission Circuit – Test
- Results and resolution
Applicable truck models
This troubleshooting procedure applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families. Specific serial number prefixes covered are 8YS, 9NS, 5DS, and 1LW. The configuration referenced in the document is the C-12 Truck Engine 9NS00001-UP. These engines are commonly found in Class 8 on-highway trucks equipped with Eaton Top 2 automated transmission systems. For additional technical resources and parts information, visit Caterpillar’s official support page.
Who needs this C-12 auxiliary output troubleshooting manual
Diesel mechanics and workshop owners diagnosing a low-current or open-circuit fault on Auxiliary Output #03 in CAT 3406E, C-10, or C-12 engines need this reference. It is essential when the ECM disables Eaton Top 2 mode and forces manual solenoid operation, as it directs the technician to the correct circuit test procedure.
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