Problem Solved. The companion app somehow turned on the tellicoil when I wasn’t looking.
I tried it this AM and had to turn the coil on to hear the EMI.
So, the car is actually a test tool to see if the tellicoil works.
Or one can use the tellicoil to hear the heart of the car: starter, injectors, etc.
But I still don’t know what that ticking is when the ignition is on and ICE isn’t running or is running.
Any ideas?
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Thanks for letting us know!
One more thing we can consider if we here “strange things” 
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Yes, I hear occasional electrical sounds with my old resound HAs. I haven’t noticed it in the car though. My dishwasher has WiFi, so I’ll occasionally hear it at the end of a load if I don’t open its door to turn it off. There are other household sounds that appear but mostly I ignore them. I’ll be “looking” from now on.
I take my hearing aids off when I drive because I have a convertible, and there are SO many extraneous noises I don’t want to hear-just my music and my V-8!
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Cars with direct injection have a much higher fuel pressure, so the injectors probably also have a higher energy and might be more likely to produce electromagnetic emissions.
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Fuel pump, usually submerged in the tank?