I have seen this issue and I am able to reproduce it fairly easily. I am not sure yours is the exact issue, but is sounds like it.
The problem is the car thinks a blue tooth call is still in progress even though you may have powered off your phone. You can tell this because if you adjust the volume on the center stack, the car will show it is adjusting the phone volume even though there is no phone call in progress or the phone is powered off.
I am able to reproduce it doing the following.
Your phone must be bluetooth linked to the car.
Make a call and switch your audio source for the call from phone to car and back to phone. You must do it quickly ...
You may have to do this a few times, but I am almost able to do it on the first try ..
The fast switching seems to confuse the car's bluetooth and it never acknowledges the fact the call has switched back to the phone.
The way to get the car to acknowledge the call is ended is too push the button on your steering wheel to make a phone call, then push the button to hang up.
As for an update, I was getting a different answer depending on who I spoke to. After two months of dealing with GM/OnStar I supposedly had all the updates I could get, but I was still able to reproduce the issue. Last I heard from GM/Onstar was that a fix was in the makes and would be available at the end of this year or early next year.
Last edited by ewiggins; 11-02-2013 at 06:05 PM.
2/3/2012 - Volt Owner #05396
Baton Rouge, Louisiana