Rep Power: 0

I currently own a 2008 Honda Civic EX-L coupe with Navigation. Moreover, the main problem I have is presently the aux or Bluetooth and the stereo. The problem is that when I'm connected to my aux with Bluetooth, I would hear this buzzing sound in the background even when the music is playing. Sometimes I would go over a bump, and the music would some reason, only be on the passenger side; the only way It would fix it is when I'm driving for a good 30 minutes to an hour or constantly keep plugging in my 12-volt battery above the aux port. The radio works fine and has no problem when I switch from aux to fm. I ordered an aux port almost a year ago from Amazon, and I believe that the aux port isn't the problem. If you're able to help me or reply, that will bring great help to me.

 
Rep Power: 125

Aftermarket deck?

Sounds like it may not have been installed correctly. Take it out and check the connections, with emphasis on the speaker wire and Bluetooth adapter.

Even if it is the original one (not sure if those came with Bluetooth), check. Could be that the previous owner changed back to the original one for resale and they reinstalled it poorly.

 
Rep Power: 0

The previous owner had the aftermarket deck installed, and I'm currently using Bluetooth through my aux and not the aftermarket deck. Overall, I should check the connection, if I'm not wrong?

 
Rep Power: 125

Yes. What could have happened is they didn't use an adapter harness and spliced everything together. It could be that some of the connections are garbage.

 
Rep Power: 221

Guaranteed they did a hack job