Troubleshooting Tip: Bobcat S175 Engine Controller ECU

A common issue with the **Bobcat S175** is intermittent engine shut-down or failure to start, often traced back to the **ECU Engine Controller** (e.g., **6678675**).

Symptom: The engine cranks but won't fire, or randomly dies during operation. Diagnostic codes may point to a loss of communication or sensor fault.

Solution: Before replacing the expensive **engine controller unit**, first check the wiring harness, particularly the main power and ground connections to the ECU. Moisture or corrosion in the harness can mimic a faulty ECU. If the wiring is clean, you may need a programmed replacement **6678675**. Always ensure your new or refurbished ECU is correctly programmed for your specific machine serial number to ensure all functions, including the hydrostatic drive and control valve actuators, operate correctly.

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