Peugeot Boxer Torque Converter Failure

Sounds rough. Those symptoms all point to the torque converter. Is the grinding noise constant, or just when it's trying to lock up? Think of the converter like a spinning water wheel – if the lock-up clutch isn't grabbing right, it'll slip and make a racket. Have you checked the transmission fluid level and condition? Low or burnt fluid can cause havoc with the lock-up clutch.

The grinding noise is most prominent during shifts, and when the lock-up clutch should be engaging. The transmission fluid level is okay, but it's darker than usual, though not overtly burnt. Could this fluid be a factor, or is it more likely the torque converter itself?

Okay, grinding on shifts and lock-up pretty much seals the deal. Dark fluid isn't helping, but it's probably a symptom, not the cause. Think of it like this: your converter is already failing, and the worn parts are contaminating the fluid. Time for a shop visit, I'd say. They'll be able to confirm the converter's toast and give you a proper diagnosis.

I consulted a workshop, and they confirmed the defective torque converter lock-up clutch. The repair, including parts and labor, was about 2120€. The vehicle is now operating as expected.