Toyota Yaris 2013 1.4 D4-D - Dubious sound

[Alessandro]

I have a 2013 Toyota Yaris 1.4 D4-D, and I'm experiencing a humming or growling noise when the clutch pedal is not pressed. As soon as I press the clutch pedal, the noise disappears completely.

I had the same noise even before replacing the clutch, and I initially thought it was caused by a worn clutch. However, after having the clutch replaced recently, the noise is still present.

This makes me think the issue might be something else, like the dual-mass flywheel or maybe something in the gearbox — perhaps the input shaft bearing?

I've attached a video recording of the noise for reference. Any ideas or advice would be appreciated!

https://youtube.com/shorts/X2lXHH5Dyh0

[komichal]

I have something similar in 2007 Yaris.
I can hear it best when the car is idling in neutral, no pedal pressed.
It goes away once I nudge the gearstick towards 4 speed gear. Just a few milimeters.
I guess the gearbox is simply a bit worn out after 250 tkm. Oil changed regularly there, I am using original Toyota fluid.