My 2024 AT4 is making cricket nosie

[Raweeer]

My 2000km Sierra AT4 3.0 Disesl is making this wired noise after driving for 20-30 minutes when the truck is at normal operating temperature. The noise will come up when driving slowly or reversing.

I have sent it to the dealership once but they said there's nothing wrong with the truck.

Anyone have a similar issue before or do you guys know the source of the noise?

I do appreciate your time and response!

Reddit post

[Gangly]

It seems to directly coincide with the flashers.  Possibly something to do with the aftermarket lighting on the rear of the truck?

[Silverado4x4]

I agree with Gangly that it's in rhythm with the flashers I would unplug the rear light bar and see if it still does it. Might be the lightbar itself buzzing.