When the car warms up there is a terrible static noise?

2007 PONTIAC TORRENT

115,000 MILES • 2.6L • 6 CYL • AWD • AUTOMATIC

JACKSON00099

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When the car warms up there is a terrible static noise. It only lasts a couple of seconds but is very loud. It is even there with the radio off and the heater turned off. Occasionally it will happen when the directional signals are on. This noise doesn't happen when the car is cold. The noise sounds like it is coming from the rear speakers. I hope you can help me with this.
Thanks

Jan 13, 2015 at 8:11 AM

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HMAC300

AUTOMOTIVE REPAIR CONTRIBUTOR
48,601 POSTS

check for a ground cable from battery to body loose or missing also from engine to body. should be one by battery lh side of vehicle

Jan 13, 2015 at 12:27 PM

STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,176 POSTS

It can be an ignition coil shorting out or a broken spark plug. Also, there can be a diode that is out and it will allow AC voltage into the system, here is a guide to you find out.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Please go over this guide and get back to us.

Dec 2, 2024 at 4:16 PM