What is the cause for a high-pitched alarm sound that comes through the stereo speakers?

Sounds like the OnStar.There could be a malfunction that is making it activate.

I have that beeping noise too every time I start the car and some time randomly at anytime and even worse I use the car for limousine it really annoys me when it's beeping while I have customer in the car. Sometimes they asked if if the car gonna blow up lol. I have 2014 xts btw

I have a 2007 STS-V and i also have the random beep tone that lasts from a few seconds to several minutes. The tone got progressively worse over time until it sounded every time I started the car. I traced it to the Bose amplifier (driver side trunk). I ordered one from eBay ($72) a new one from the dealer is about $700. I'll update after I replace it.

Hello, I have a small caveat to deliver, I received to Bose amp and an education. My car is equipped with Bose surround sound which is different than Bose stereo, the amps look identical except for one has a grey 32 pin plug (surround sound) and one has a blue 32 pin plug (stereo) and they are not interchangeable. Buyer be where..... good thing it was only $72 as electrical parts are returnable...

My 2008 CTS 3.6, has a very faint beep at low speeds in the interior. It comes on for a few seconds (up to 20-30 seconds) then stops. Then a different pitch for a few seconds then stops. Seems electronic. Becoming unbearable. Changes tones and never more than one tone at a time. Faint, but mind-numbing! Sounds like the hearing test they give you in the booth. On Star not activated, sat radio deactivated, stereo off. still there. HELP!

i dont have onstar

Did anyone get a answer for this noise?

I don’t have any answers but mines dies it too all day long when ever I drive it’s driving be crazy and some one told me it could be the alarm I’m going to get some one to remove the fuse maybe it will stop

Hi today my Cadillac Escalade started making that high pitch Amber alert sound. It didn't stop until we got home. No indicator popped up. My fiancé and we're freaked out.

My SRX started beeping 5 times every so many minutes until I got home but before I actually got home I noticed that it was beeping because I had my back pack and a 12 pack of Pepsi in the passenger seat and apparently the car thinks those items should have a seatbelt.