This document is a CAT C-12 transmission troubleshooting guide covering diagnostic trouble code 0191-07 “Transmission Not Responding (68)” for 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate this fault code, the system response when the code is active, and the recommended diagnostic test step to resolve the issue. Published by Caterpillar under media number RENR1328-08, it is a single-page reference intended for technicians diagnosing Eaton Top 2 transmission communication faults.
Official CAT C-12 transmission troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS (9NS00001-UP); also applicable to 3406E and C-10 |
| System / Group | 3406E C10 C12 (8YS, 9NS, 5DS, or 1LW) — Diagnostic Trouble Codes (DTCs), SMCS 3174-038 |
| 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
- 0191-07 Transmission Not Responding (68) — overview
- Conditions Which Generate This Code
- System Response
- Test Step 1: Perform the following diagnostic procedure — Eaton Top 2 Transmission Circuit – Test
Applicable truck models
This bulletin applies to Caterpillar truck engines in the 3406E, C-10, and C-12 families, specifically the C-12 9NS configuration (serial prefix 9NS00001-UP). Other serial prefixes referenced by the broader publication include 8YS, 5DS, and 1LW. The fault code targets installations where the “Transmission Style” parameter inside the Engine Control Module (ECM) is programmed to “Eaton Top 2,” meaning trucks equipped with an Eaton automated or semi-automated Top 2 shifting system. For additional product support and the latest service information, visit Caterpillar’s official support page.
Who needs this CAT C-12 transmission troubleshooting manual
Fleet mechanics, independent diesel technicians, and workshop owners working on 3406E, C-10, or C-12 powered trucks will use this document when the ECM logs DTC 0191-07 after three failed Eaton Top 2 shift attempts. It provides the exact conditions that trigger the code — including how the ECM disables Eaton Top 2 mode and locks the currently enabled solenoid in the ON position until neutral is detected — along with the single prescribed diagnostic step: performing the Eaton Top 2 Transmission Circuit test.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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