Q: Why doesn't audiobook app in CarPlay have sound when music app does?

I have exactly the same issue.  Just got a 2016 Honda Civic Ex with carplay.  Audiobook worked on way home from dealer but not since.  It recognizes the book but no audio.  I also tried each of the rebooting outlined in the original post.  The book will play via bluetooth but kinda defeats the purpose of having carplay.

I Took a shot in the dark and downloaded the Audible.com audiobook app for iOS.  I downloaded 1 of my books on Audible, connected my iPhone and the app is recognized in CarPlay and more importantly, it played the book with sound.  Until and if Apple fixes ibooks, this is my workaround.  Hope this works for you.

Same problem here. 2016 Honda civic. Everything works with CarPlay except the ibooks audio. Really hope Apple comes out with a fix soon, this is terribly annoying.

Same problem with my 2016 Honda civic - audiobooks play but no audio is heard through speakers.

Guess I'll chime in with a "me too". Glad to find out it's not just me, but annoyed that it's not something easily fixable. I tried Audible very briefly, didn't seem to be working but I didn't have much time to fiddle.

So I just had this same issue but while I was on the phone the audiobook played!! Once the call ended though the audio stopped again. Too weird

I'm having this issue too. A little concerned it's being going on since February with no resolve.

The iOS 10 developer preview doesn't exhibit this problem, so apparently a fix is coming... In several months...

Just leased two new Honda Civics...is this a Honda issue?? I'm having the same issue in both cars.

I have a 2016 Honda Accord and use Carplay with my iPhone 6 plus for audiobooks and podcasts. Carplay works 95% of the time but the other 5% is exceedingly frustrating. The issues are: an audiobook will play but so sound, an audiobook will show on the Honda's carplay screen but the start arrow is unresponsive, an audiobook will only play until the phone goes into powersaving mode then stop, carplay will start on a random track after plugging in and very rarely, an audiobook will not start.

I can fix all of these problems by resetting my iPhone except for the random starts.  These require the hunt and play method.  Occasionally, I can fix the sound problem by going to a completely different book and starting it. It seems to me, in my non-technical way of thinking, that Carplay somehow corrupts something in the iPhone under certain circumstances.  I can't always reproduce this, unfortunately.

I bought the Honda because it had carplay and love it (and the Accord!) most of the time but these are puzzling and frustrating problems that I hope can are fixed in iOS 10.

I was also going crazy trying to figure out why some things worked and others were silent (audiobooks and music). I looked through all the file details, and those with a sample rate of 22.050 kHz files always ended up being silent. Convert them to 44.1 kHz and they'll work.

Unprotected file conversion (music and audiobooks)

1: Edit -> Preferences -> Import settings -> (i like to use MP3 Encoder) -> Setting-> Custom

2: Set Sample Rate to 44.100 kHz and set bit rate to whatever you want (usually i do 256kbps for music and 128kbps for audiobooks)

3: Hit all the okays.

4: Highlight files, then Go File-> Convert -> Create MP3 Version

5: If it was an audiobook, the conversion will make it music, so select those files, right click -> get info -> if it ask if you want to edit multiple items, click edit items -> options -> media kind -> audiobook

For protected audiobooks, like Audible you have to get past the DRM, supposedly this works but I havent tried it yet https://community.giffgaff.com/t5/Tips-Guides/Mastering-audiobooks-liberating-Au dible-books/td-p/18277766