High pitched noise from stereo

[ukrkoz]

Hi all
I have high pitched noise, changing with RPMs, coming from stereo speakers. It is on and off, sometimes louder, sometimes quieter. SUPER annoying. No noise when stereo is turned off. Started about 6 mths ago.
Thank you

 

[intheburbs]

Interference from the ignition system. First thing I'd do is check/replace your plug wires.

 

[ukrkoz]

Wires are new as of just over a year.

 

[Joseph Garcia]

Is your stereo OEM or aftermarket?

Does the noise come from all 4 door speakers at the same time?

 

[tom3]

Used to be a problem with alternators doing this but usually with aftermarket stereos. The fix was a filter in the power supply line to the stereo. Any changes in your sound system?

 

[ukrkoz]

Stereo is OEM.
BT added about a year ago but it was all fine untill recent.
Alternator is OEM.

 

[Fless]

Check underhood ground wires. The hood should be grounded to the firewall and there are several others that can contribute to lack of shielding.

 

[ukrkoz]

So, check all ground straps?

 

[Fless]

Straps, cables, anything that should make a ground. You could experiment a bit with jumper cables, with one end on a good ground and moving the other end to various locations on the truck.

 

[Joseph Garcia]

Stereo is OEM.
BT added about a year ago but it was all fine untill recent.
Alternator is OEM.

What is BT?

 

[ukrkoz]

Bluetooth

 

[Joseph Garcia]

OK.

Does the noise come from all 4 door speakers at the same time?

 

[ukrkoz]

Can't tell. I have 8 speakers. Definitely in the front.

 

[Doubeleive]

Can't tell. I have 8 speakers. Definitely in the front.

does it make the noise with key-on, engine off? if so then it's possibly a internal radio issue, be sure everything else is off when testing hvac, lights, etc.

 

[ukrkoz]

Nope. Only with engine running and directly related to RPM.

 

[Doubeleive]

Nope. Only with engine running and directly related to RPM.

then either there is a bad ground connection somewhere or the radio is going out
you can try cleaning up grounds, the battery ground and there is also a ground on each side of the truck pretty much right up under the front wheel well area on the frame that get gunked up. maybe look the gm upfitter guide webpage and try and locate the radio ground wire, they have wiring diagrams
@swathdiver may have it on his aldaty

 

[ukrkoz]

Got it

 

[jeremiahm]

Are you running your bluetooth from the AUX port?

I run BT in the AUX port and started to get this about a year ago, it is the connection in the jack, if I "spin" the jack in the port it clears up and gets worse, depending on the rotation.

 

[Doubeleive]

if you suspect the BT adapter then just unplug it or disconnect it.

 

[ukrkoz]

No, it's plugged into the harness. Behind the head unit.