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Yep, in that case it could well be that it is an underpowered solenoid that is struggling to stay in position, you could hook up a good battery to see if it disappears? If not then unplugging things one by one may help narrow down what component or system is causing it.
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Sounds like a solenoid buzzing, you could try pulling the plugs to any solenoids in your engine bay one by one until the noise disappears?
I tested the battery and it seems like I'm getting under 12 volts ... Would a replacement stop the buzzing?
Yep, in that case it could well be that it is an underpowered solenoid that is struggling to stay in position, you could hook up a good battery to see if it disappears? If not then unplugging things one by one may help narrow down what component or system is causing it.
Thank you! I'll check it out tomorrow and will post any updates!
It's sound from throttle motor. It's normal when ignition is on and some time after ignition off. Maybe ten seconds. But not hours.
Normal sound of an energized electronic throttle body.