C70 automatic transmission shifting problems

I had similar shifting problems with my automatic gearbox in a 2012 Opel Insignia. The symptoms you describe match what I experienced. Check the transmission fluid level and condition first. When was the last time the transmission fluid was changed? A transmission flush might be a good starting point.

Thanks. I haven't changed the transmission fluid since I bought the car and I don't have any record of it ever being changed. If the fluid level is fine, could contaminated or degraded fluid cause all these symptoms? What eventually solved the issue for you?

Yes, degraded fluid can certainly cause those symptoms. In my case, the worn-out transmission oil was causing the issues. A complete transmission flush and fluid replacement resolved the problem. I would advise taking it to a qualified workshop for diagnosis and repair.

The workshop visit confirmed it was old transmission oil. They performed a transmission flush and replaced the oil. The total repair cost was 240€. The shifting problems are now resolved. Thanks for the advice!