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In searching for my first [used, Gen 1] Volt, four of the five 2012-14’s I’ve driven have had the very annoying high-pitched ~12 kHz ambient whine during Hold/Regen, even with the rear load decks properly seated. I gather from many threads that most attribute the noise source to the APM (DC-DC converter module) under the hatchback floor, but none report fully eliminating the noise. Has anyone tried replacing their DC-DC module, or have even braver souls perhaps figured out which module component(s) were vibrating and successfully potted them to dampen/eliminate the root cause of the noise?
 
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