This document is a CAT C10 0051-06 troubleshooting guide that addresses diagnostic trouble code 0051-06, Auxiliary Output #03 Current High (67). It provides the conditions that generate the fault code, the ECM system response, and the required test procedure for resolving a high-current short circuit on auxiliary output 03 in 3406E, C-10, and C-12 on-highway truck engines.
Official CAT C10 0051-06 troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS00001-UP; also applicable to 3406E and C-10 on-highway engines (8YS, 9NS, 5DS, 1LW prefixes) |
| System / Group | DTCs — SMCS 1901-038 (Electronic Control System) |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code — describes the high current (short circuit) condition detected by the ECM on auxiliary output 03
- System Response — details how the solenoid remains ON until neutral is detected, then switches to manual operation (both solenoids OFF), and how the ECM disables Eaton Top 2 mode
- Test Step 1: Eaton Top 2 Transmission Circuit – Test — the prescribed diagnostic procedure to verify circuit integrity
Applicable truck models
This bulletin applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families, specifically configurations with serial prefixes 8YS, 9NS, 5DS, and 1LW. The primary configuration referenced is the C-12 Truck Engine 9NS00001-UP. These engines are widely installed in Class 8 on-highway trucks equipped with Eaton Top 2 automated transmission systems. Mechanics working on any platform using these CAT powertrains and the Eaton Top 2 transmission mode should reference this code. For additional Caterpillar service resources, visit Caterpillar Official Support.
Who needs this CAT C10 0051-06 troubleshooting manual
Fleet technicians and independent diesel mechanics diagnosing a code 67 (0051-06) on 3406E, C-10, or C-12 engines need this document. Workshop owners maintaining trucks with Eaton Top 2 transmission integration will also find the step-by-step circuit test essential for resolving short-circuit faults on auxiliary output 03.
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