This 14-page CAT C15 transmission troubleshooting document provides the complete diagnostic procedure for fault code 0191-07 (Transmission Not Responding) on Caterpillar C15 on-highway truck engines with Eaton Top 2 automated shifting. It covers system operation, ECM solenoid output testing, wiring inspection, and gear ratio parameter verification using Cat ET service software.
Official CAT C15 transmission troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Eaton Top 2 Transmission Circuit — DTCs 0191-07, 54-05, 54-06, 55-05, 55-06 |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0191-07 Transmission Not Responding (68) — Conditions Which Generate This Code, System Response
- Eaton Top 2 Transmission Circuit — Test (System Operation Description, Background Information)
- Wiring Connections at the ECM — Output No. 6 (Lockout Solenoid), Output No. 7 (Shift Solenoid)
- Customer Specified Parameters — Transmission Style, Top Gear Ratio programming
- Test Step 1 — Perform Eaton Top 2 Transmission Circuit diagnostic procedure
- Test Step 2 — Inspect Electrical Connectors and Wiring (J1/P1 ECM connector, firewall bulkhead connectors)
- Special Tests — Shift Solenoid and Lockout Solenoid cycling via Cat ET Diagnostic Tests
- Voltage Test Lamp Procedures — Terminal A (Output No. 6), Terminal C (chassis ground), breakout T connections at P1-19 and P1-20
- Test Step 6 — Check Gear Ratios (customer specified parameters verification in Cat ET)
- ECM Replacement Verification — Test ECM swap procedure
Applicable truck models
This document applies to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP, equipped with an Eaton Top 2 transmission. The Eaton Top 2 system controls automatic shifting between the top two gears (ninth and tenth on a ten-speed, or twelfth and thirteenth on a thirteen-speed transmission). The ECM manages both the shift solenoid (Auxiliary Output #07) and the lockout solenoid (Auxiliary Output #06). The “Transmission Style” parameter must be set to “Eaton Top 2” for the system to function. The procedure also references the “Eaton Top 2 Override with Cruise Switch” parameter. For additional product support, visit Caterpillar’s official support page.
Who needs this CAT C15 transmission troubleshooting manual
Diesel mechanics and workshop owners servicing Caterpillar C15-powered trucks that display DTC 0191-07 or related solenoid fault codes (54-05, 54-06, 55-05, 55-06) need this procedure. It requires Cat ET electronic service tool access and a breakout T for ECM connector terminal testing.
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