Seat Tarraco automatic transmission problem

The symptoms you describe do indeed point toward a potential issue with the control unit governing your Tarraco's transmission. The erratic shifting, display malfunction, and stored error codes are strong indicators. Have you checked for any obvious sensor problems that might be feeding incorrect data to the control unit?

Thank you for your quick response. I have visually inspected the accessible sensors and wiring, but I lack the diagnostic tools to perform comprehensive testing. Could a faulty sensor truly cause such widespread issues, including the instrument panel display failure?

Yes, a malfunctioning sensor can cascade into numerous problems, much like a faulty thermostat causing an engine to overheat even if the radiator is fine. Given the complexity of modern automotive electronics and the integrated nature of the instrument panel and transmission control, I would recommend a professional diagnosis. The workshop should be able to pinpoint the exact cause, be it a sensor problem or the control unit itself. A thorough inspection will also rule out any wiring harness issues.

I appreciate your insight. It seems I was on the right track, but lacking the deeper knowledge to confirm my suspicions. I will schedule an appointment with a certified workshop to address the control unit. Thank you for your time and expertise.