Xperia M4 bluetooth car audio problem

[seekam]

Ever since my M4 Aqua updated to marshmallow version 6.0.1 when I connecting it with my car's bluetooth (KIA RIO 2012) I have problems with my calls! The people on the other line can't hear me...my voice is hearing too low! I have tested the car bluetooth with Samsung Galaxy S6 and galaxy S8 and are working perfect? It's obviously a problem with my M4 and version of Android.  I've done reset but nothing changed.

I have talked with Sony at my region and they said that's is not Sony fault.

What can I do? I wanted to buy again Xperia but I am afraid that I will have the same problem at the future!

What can I do to solve my problem?

[AZ14 · Accepted solution]

I have the same issue. There is one let's say emergency way of dealing with it. I do not call it workaround since it is extremelly dangerous while driving a car.  Durign call tap on bluetooth audio icon (at the bottom left of the incomming call screen) and choose speaker audio. You will be switched from car audio speakers to phone speakers. Than switch again to bluetooth audio and you microphone audio will come back. Unfortunatelly you must do it each time receiving a call.

The issue is no doubt Sony Xperia m4 Aqua issue (not my car audio). I checked different Sony Xperia model on my car audo bloototh station and it worked. Also the semi-quasi-do-not-use-workaround proves it is software problem tied to Sony Xperia m4 Aqua. Theoretically it may be Android 6.0.1 marshmallow isue also.

I am very disappointed with Sony Xperia product. It looks like quite basic functionality not tested at all.

[Pinocho1]

Activo Bluetooth en mi carro y en 5 segundos se desactiva en el carro

I activate Bluetooth in my car and in 5 seconds it deactivates in the car

gt