High pitched noise from stereo

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

ukrkoz

Full Access Member
Joined
Feb 16, 2021
Posts
247
Reaction score
124
Location
Auburn WA
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

Full Access Member
Joined
Aug 10, 2017
Posts
774
Reaction score
1,336
Location
SE MI
Interference from the ignition system. First thing I'd do is check/replace your plug wires.
 

Joseph Garcia

Supporting Member
Joined
Aug 2, 2018
Posts
6,394
Reaction score
8,325
Is your stereo OEM or aftermarket?

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

tom3

Full Access Member
Joined
Jul 15, 2019
Posts
781
Reaction score
1,117
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?
 
OP
OP
U

ukrkoz

Full Access Member
Joined
Feb 16, 2021
Posts
247
Reaction score
124
Location
Auburn WA
Stereo is OEM.
BT added about a year ago but it was all fine untill recent.
Alternator is OEM.
 

Fless

Staff member
Super Moderator
Joined
Apr 2, 2017
Posts
10,252
Reaction score
20,311
Location
Elev 5,280
Check underhood ground wires. The hood should be grounded to the firewall and there are several others that can contribute to lack of shielding.
 

Fless

Staff member
Super Moderator
Joined
Apr 2, 2017
Posts
10,252
Reaction score
20,311
Location
Elev 5,280
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.
 
Top