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2016 Hyundai Sonata - Radio cycles off and on

the radio will shut off for 3 seconds then turn back on. repeat. as long as the car is running.

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Take it to a shop that specializes in car audio. It could just be a loose connection but I doubt it. You’ll probably need a new radio.

+1
Or, it is conceivable that a failing alternator–with wildly varying output–could do the same thing. In fact, that happened to me many years ago, for a few days before the alternator totally died and stranded me.

I had the radio in my 2013 Equinox reflashed twice under warranty due to the radio turning itself on randomly or not shutting off after exiting the car. Might be worth a call to the dealer or Hyundai to see if it’s a known issue.

Ed B.

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