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Is there a clue in the highlighted bit above. I'm not sure that one catastrophic failure could cause an instant stretching of the chain, but if the chain had previously 'stretched a lot' could it have jumped or in some other way caused the reduced power/drive, then confused the DCT box? Mike

"We'll watch with baited breath." Indeed we will.

I'm beginning to wonder if it is, as others say, down to the chain coming off the gearbox sprocket. A lot of guesswork but if the chain began to tighten/seize (apparent loss of power?) and then suddenly jumped the sprocket (bang?), the engine would rev high (no drive, feels/sounds like it has dropped down several gears), and the DCT system would determine a fault (comparing wheel speed and gearbox speed would say something is wrong, [--] showing in window), at which point it decides to default to a safe mode when the speed drops (hence fixed in second gear when coming to rest?). As said, a lot

I like Mike think it has some thing to do with the chain, has it come off and gone in-between crankcase and sprocket and the one side of the sprocket continued to drive the rear wheel but under reduced torq, hence the need to change done a gear or two but still not enough drive. Just a thought, did you check? Lyn.

Actually thinking about it, I don't believe it can physically go from 5th to 2nd in one go, just like you can't do it on a manual bike, it has to go through the sequence of gears because the shifter only moves the selector shaft 21 (above) one gear at a time before returning to centre, just like a foot-pedal does. Similarly I don't think it will shift down more than one gear without engaging the clutch for it, at least I can't recall ever getting it to do that when pressing the "-" button repeatedly, I'm sure it selects each gear then goes to the next one (I think .....) Definitely someth

Not good. Glad it didn't happen on the motorway. Let's hope it turns out to be something simple and the dealer can fix it quickly. Is it still under warranty?