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Bluetooth OBD

2243 Views 6 Replies 6 Participants Last post by  canehdian
I have a 2011 Volt. Quite a while ago I read somewhere that if you use a bluetooth OBD device and leave it plugged in all the time, you will not be able to use Onstar as far as vehicle status and/or remote key fob commands. Is this true? Something about the car can only use one communication device at a time, like OBD and Onstar. I do have an Onstar subscription so I can get charging status updates and start my car remotely, I live in Phoenix and is nice to start it 10 minutes before I leave work.
If I can use both Onstar for the above mentioned features AND an OBD device, which android app is the best for monitoring the Volt systems?
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I had an OBDII BT adapter plugged into my 2013 Volt from day one. It is plugged in all the time. The only time I unplug is when I give it for service, or when I need OnStar to run remote diagnostics on demand (they will not be able to connect for on-demand Remote Diagnostics if the OBD2 port on drivers side is plugged in). OnStar remote link web/app works fine (remote start/stop, vehicle location, charge status, etc)
Onstar functions work normally, but will not work for diagnostics (including the monthly email).
Presumably this is because the ECU will not allow more than one OBD2 connection at a time, and your bluetooth device is already active when powered on.
I've received the email in the past, but it said unable to connect or similar error message in the actual body of it. YMMV
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