Burning rubber smell from back of car, while just driving on ECO.

[Phev2016]

"the smell came during engine running and charging" which is when the engine and exhaust will be hottest and likely cause of smell. If your transmission (or whatever word is now acceptable on the forum) was creating a smell you'd have been in real trouble and an oil change would be unlikely to fix it.

 

[Haenzel]

It's usually just stuff on the exhaust pipe burning off because the PHEV exhaust pipe gets hotter than a normal ICE would generally, as you get high engine output at very low speed where there's no cooling airflow, whereas you can't do that in an ICE without driving against the brakes.

This is not a new hypothesis, but it's been oft dismissed by people that don't understand it or haven't considered my point above.

How do you explain the smell is still there a day after having driven 1200 km and having crossed multiple steep low speed mountain passes where the ICE has worked like never before?