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Try this same test, but in a different location (i.e. outside of your garage or away from your home). Maybe picking up interference from something in the garage or your home.

Regards,
/BTV
 

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No, no, no...this is common noise with all the Lambdas, it's been discussed at least a couple places, do a search for it. That high pitched hum is heard whenever the key is in the ACC or ON position, with the engine not running, it's totally normal.

***I'm not really a newbie, I just don't post here....I have over 900 posts on the Enclave forum (kidsenclave), and have some posts on Acadia and Traverse forum.....just wanted you to know I've been around***
 
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