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I misunderstood ... I thought it was a faulty part issue.
Have you driven around in other K2XX SUVs to confirm that it's you and not the module?
I think the thing is, it's such a high pitched noise (like that you can sense a tv is on in the other room) That it's probably just how it is, and a very small percentage of people can actually hear it, and complain. In a few years my ears will change and i probably wont be able to hear it.
I test drove a denali a few months ago and thought it might be a wiggling of parts together or something so i brushed it off. It's so minuscule that its almost like it's your imagination. but once you hear it, you can't unhear it lol.
I've noticed a similar high-pitched static/interference noise. It ONLY occurs when I have my fog lights ON and the radio tuned to an AM station. If I change the station or turn off the fog lights, the sound goes away.
Sounds similar, but different, to what was found here. Just another theory for those looking to find the annoying sounds that some of us hear.
I would guess that's more of an Iinterference of some sort. Stock fogs or leds/hids?
Just picked up my 2015 Denali yesterday - LOVE IT.
However, it has one VERY VERY ANNOYING problem.
At speeds 1-70 ish - it has a electrical high frequency type noise coming from the LF of the dash. Almost sounds like 2 necklaces jingling together. It is one of the most annoying sounds I have ever heard.
Anyone else heard this? The last thing I want is the grease monkeys at the dealership tearing my dash apart and breaking everything that have to remove in the process. If I had to take a guess - its either the cluster, HUD display module or something in the center stack. It sounds like one of the electrical components making the noise. Sometimes I can even replicate it sitting still. It goes away at about 70 mph and above though.
check this out
http://www.tahoeyukonforum.com/forum/showthread.php?t=64782&page=12