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I'm hearing a high-pitched whistle coming from the engine area. Seems to be electrical because it's still there even with the engine off but power on. Anyone else notice this?
 

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This is normal. There is another thread about this, something is powering down. I think of it as my "did you lock the car" noise.
 

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Its the solenoids in the transmission. They are controlled by the Transmission Control Module (TCM) which keeps the solenoids active until it goes to sleep (power down), which is typically 10 seconds.

Hope this helps.
 
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