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07 CTS AM radio Static

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My AM radio sometimes has a unusual amount of static not caused by interference. When it happens I can tap the headliner behind the sunroof & it corrects for the next bump or whatever wants to kick it out. It's been back for repairs twice. Any suggestions

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Turn on the battery but not the car then try the radio reception. If it is better with the car engine not running than it is with the engine running that would suggest some electromagnetic interference from the engine.

I put the detailed diagnostic here for poor radio reception (ignore the hyperlinks within the document)


2023 Cadillac CT4-V Blackwing

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