good afternoon everyone
please tell me, the start / stop button stops working, while fuel consumption increases greatly, a strange sound appears under the hood and there is a strange smell of burnt plastic. On the service, only the start / stop button gives an error. they do not see other errors. what could it be ?

video in attached

check to see any fuel is leaking at the bottom ?

there is nothing, it feels like something is overheating, the fan turns on in parallel

Is it a DPF regeneration?

unfortunately I don’t know, but an incomprehensible sound seems to come from a black plastic box

and today the traction still disappeared, the car picked up speed very slowly. there was no reaction to the gas to the floor.

in neutral gear on the video gas to the floor, and the engine speed does not increase to the maximum

look like you need to dealer to check out, not sure what the issue,

I don’t own a diesel, but would this be a rev limiter like gas engines have, ostensibly to reduce emissions?