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There is a known issue where the sub woofer makes a pop or thump when you get near the car with the fob/during wake-up event. Here is what I found-

2017 MKC – Without THX Audio Systems – Subwoofer Double Pop Noise During Wakeup Event And/Or Speaker Fade Setting Returns To Default After Key Cycle

Some 2017 MKC vehicles without THX audio systems may exhibit a subwoofer double pop noise during a wakeup event and/or the speaker fade setting returns to default after a key cycle.

A wakeup event may include any of the following actions: door open, key fob used, tailgate activated, etc.

The noise could also be described as a low tone bump sound, as if someone lightly tapped on the most rearward side window.

Reprogram the audio control module (ACM) to the latest calibration using the Integrated Diagnostic System (IDS) release 102.04 or higher.

Make sure you are connected to the internet when entering module programming to obtain the latest updates.

Calibration files may also be obtained at www.motorcraftservice.com.
 

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Have a 2017 MKC that we purchased 2 months ago and we are having this issue. I believe the vehicle was made in late 2016. Your description of the problem is quite thorough and technical. I am a DIY'er , is this something I could do to solve the issue or is it best to take it back to the dealer? You mentioned that this is a known issue so I would assume the dealer should know about it. Thanks
 

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It's a software update for the audio control module. The
Dealer needs to do that.
 

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...same thing here..or is it??????

....I am following you guys very closely...my new 2017MKC (2090 mi) is having a similar "thump" but I noticed it when I back up and shift to drive...I notice this noise only when the radio is on...I ahve tried to duplicate incident with radio off and no noise....
Could I be hearing "things"??????? .....you know the "demographics thing"....<S>
 

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My '17 Fusion does this. It has the 11-speaker (powered) system. I've never heard turn-on pop in an OE vehicle prior to this.
 
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