[Kezkelly]

Hi all, my first post and I think this is a common problem, but is there a quick way to fix the buzzing in the door lock.

[The Gonz]

Hi, welcome. Just so you get better advice, how about you describe your car's model, age, etc?
On the whole, it's either a warranty job if new enough or a refurbishment or replacement of the locking mechanism if it's as old as I'm guessing.

[Kezkelly]

Thanks Gonz. I did put in 2009 Hyundai i30, but showed up in separate section.  Yes hoping to fix without spending more money but perhaps not.

[tw2005]

If the buzzing sounds like grinding noise after the door locks, it's likely the deadlock feature. These lock in 2 stages. Replace the lock assembly, it's all plastic gears and impossible to pull apart without cracking the case