2018 Civic Si Coupe Subwoofer Issue

  1. mymonkeyballs

    mymonkeyballs Member

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    Location:
    Ontario Canada
    Car(s):
    Civic Si Coupe 2018
    Hey guys, ever since I got my new 2018 Si Coupe (Canadian version) last year I have been having the subwoofer rattle issues as I'm sure you all heard of. I cannot find anything on how to fix this since there aren't many Canadian Si users on here with the same problem. It seems to have gotten worse over time. I tried putting some memory foam where the subwoofer is but no dice - guess that fix is just for the 4dr. Any recommendations of things to try? Thank you!
     
  2. Gotch

    Gotch Senior Member

    Joined:
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    Occupation:
    Maintenance Manager
    Location:
    Canada
    First Name:
    Rob
    Car(s):
    2018 Si Sedan Rallye Red
    Same issue here. There’s a couple of posts on the audio thread....however, I had the dealer look at it during my last service. They installed some tape backed insulation under the deck but it was still rattling. I ended up stuffing a microfibre towel in there and that stopped most of it until I can do something proper.
     
  3. OP
    OP
    mymonkeyballs

    mymonkeyballs Member

    Joined:
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    Location:
    Ontario Canada
    Car(s):
    Civic Si Coupe 2018
    I may try removing the rear deck this weekend and try and fix it myself.. hard to find some info on how to exactly do that.
     
  4. REBELXSi

    REBELXSi Señor Member

    Joined:
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    Location:
    S/E PA
    Car(s):
    '18 Si Coupe
    My rear deck used to rattle and my doors used to rattle and I fixed the deck by putting rubber stripping between the deck and the mirror. I improved the doors with weather stripping around the speakers but there is still some when the bass hits. Doesn't even have to be crazy loud. This car is annoying when it comes to interior rattles.
     
    Spike Spiegel thanked this.
  5. ablueSI

    ablueSI Senior Member

    Joined:
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    Location:
    SF Bay Area
    Car(s):
    '18 Civic SI Sedan
    I feel for you guys. My dealer fixed my rattle, proactively even, and I've heard only one rattle since.

    I consider myself lucky, it was the one major nit I had to pick with the car upon picking it up. But I do recommend just going to a dealer. Multiple, even, if the issue does not get fixed. At least it's free under warranty.
     
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