This C-12 auxiliary output DTCs troubleshooting document provides the official Caterpillar diagnostic procedure for fault code 0026-06 (Auxiliary Output #01 current high, flash code 69). It covers the conditions that generate this code, the ECM system response, and the required test steps for resolving the high-current short circuit condition on 3406E, C-10, and C-12 on-highway truck engines.
Official C-12 auxiliary output DTCs troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS00001-UP; also applicable to 3406E, C-10, and C-12 On-highway Engines (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | DTCs — SMCS 1901-038 (Auxiliary Output #01 current high) |
| 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) detection by the ECM on auxiliary output 01
- System Response — details ECM behavior: solenoid remains ON until neutral is detected, then manual operation (both solenoids OFF) until power-down; Eaton Top 2 mode is disabled
- Test Step 1 — directs the technician to perform the Eaton Top 2 Transmission Circuit test
- Results — OK condition and stop instruction
Applicable truck models
This document applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families used in on-highway applications. Specific serial-number prefixes covered are 8YS, 9NS, 5DS, and 1LW. The configuration referenced is the C-12 Truck Engine 9NS00001-UP. These engines are commonly installed in Class 8 trucks equipped with Eaton Top 2 automated transmission systems. For additional product support and serial-number lookup, visit Caterpillar Official Support.
Who needs this auxiliary output DTCs troubleshooting manual
Diesel technicians and workshop owners diagnosing DTC 0026-06 on Caterpillar 3406E, C-10, or C-12 engines will need this document. It is essential when the ECM reports a high-current fault on auxiliary output 01 and the Eaton Top 2 transmission mode becomes disabled.
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