The last recent update my iPhone did I noticed in the truck while synced the sound is noticeably lower than usual. The volume on my phone is turned all the way up yet it still seems low. For instance turning the volume to 15 was quite loud, now when I turn the volume to 15 it sounds more like its at a 7-9 area. No blown speakers in my truck, everything is good there. Just happened the day after my phone updated.
Possible fix to un-sync and re-sync my phone?

Truck info in signature.

 

Do you use the Apple Music app?

If do, Go to settings, scroll down to Music and turn Sound Check off.

That should return your volume

 

Appreciate it! Now it's back to normal.