Why is my Vauxhall Insignia's gearbox making a humming noise?

I've noticed that my Vauxhall Insignia's gearbox seems to make a consistent humming noise when I'm accelerating. What could be causing this and how can I fix it?

The humming noise could be caused by dirty or worn out gears in the gearbox. It's important to regularly check and change the transmission fluid to prevent this.

Another possibility could be a faulty bearing in the gearbox. If this is the case, it's recommended to have a professional mechanic inspect and replace it.

It's also important to regularly check and replace the gearbox oil filter. A clogged filter can cause issues with the gearbox and result in a humming noise.