Hiace auto transmission fault

Sounds familiar. I had similar symptoms with my Hiace. Any engine surging at highway speeds, especially when trying to maintain a steady speed? What mileage are you at?

Yes, there IS engine surging! Especially noticeable around 80-90 km/h. I'm at 136533 km. Was it definitely the torque converter for you? What exactly was faulty?

Yep, the surging confirms it. It's likely the torque converter. The lock-up clutch inside the converter is probably failing. I'd recommend taking it to a reliable workshop with automatic gearbox experience for a proper diagnosis and repair.

Thanks a million! I feared it was something major. Took it to a specialist and you were spot on – torque converter lock-up clutch failed. Cost me 2120€ for the repair, but it's driving like new again. Appreciate the help!