Seat Tarraco Hybrid Engine Control Malfunction

I have observed similar behavior in my Seat Tarraco. The engine stalled intermittently, and initially, I suspected the engine software might be at fault. However, after some troubleshooting, the fault codes indicated a possible ECU issue. While I am not an expert, my experience suggests you inspect the battery connections thoroughly. Ensure they are clean and properly tightened. If the connections are loose or corroded, it can disrupt the electrical signals to the ECU, potentially leading to engine stalling and starting problems.

When your Tarraco exhibited these symptoms, did the diagnostic procedures also point to a potential ECU failure, or was the battery connection issue immediately apparent?

The diagnostics initially suggested an ECU issue, but further investigation revealed that the battery connections were indeed the primary problem. I recommend you proceed to a trusted workshop to have the connections professionally checked and cleaned. It is important to rectify this before considering more drastic interventions such as ECU replacement.

Thank you for confirming that similar symptoms led to a similar diagnosis in your vehicle. As suspected, the issue was substandard cable connections at the battery. The repair cost was 155€, as the connections required replacement and recalibration of the ECU. Appreciate your input.