DS4 Torque Converter Issue

Sounds rough! I had something similar happen with my DS4. Is it like, when you're cruising at a steady speed, the engine kinda surges a little, even though your foot is steady on the gas? And the shifts feel kinda clunky, not smooth like they should? If so, yeah, could be the torque converter. That thing's basically a fluid coupling that lets the engine keep spinning even when the wheels slow down, and if the lock-up clutch inside it goes bad, it'll mess everything up.

Yes, that is an accurate description of the symptoms I am observing. The engine does indeed surge slightly even with a steady foot on the accelerator, and the gear changes are far from smooth. Could you please elaborate on how you resolved the issue? Was it indeed the torque converter, and what was the extent of the repair required?

Right, sounds like the exact same issue I had. Yeah, turned out the torque converter was buggered. Honestly, there's not much you can do yourself; it's a specialist job. You're looking at getting the transmission out and either having the converter rebuilt or replaced. I'd suggest getting it to a decent workshop that knows their way around automatic gearboxes. They'll be able to confirm for sure, but it really does sound like the converter.

I appreciate the advice. Following your recommendation, I consulted a specialized workshop. Their diagnosis confirmed a defective torque converter, necessitating replacement. The final repair cost amounted to 2120€. Once again, thank you for your insights.