Bluetooth Not Available I have a MacBook Pro (Retina, 15-inch, Mid 2015) running 10.13.6 and I am now getting "Bluetooth: Not Available" in the menu bar. I also cannot access the "Bluetooth" section within System Preferences. 



Under "Network" in System Preferences it says "Bluetooth PAN is not connected" and "No PAN devices found".



Under System Report, it says "No Information Found" under Bluetooth.



I have tried the following in an effort to troubleshoot: 


Simple restart
Simple shutdown, turn back on
No USB devices are connected, so I have none to remove
Reset the SMC
Delete .plist files in ~/Library/Preferences/ (there were no com.apple.Bluetooth.plist file in this directory for me, I had to go into ~/Library/Preferences/ByHost to find two com.apple.Bluetooth..plist files
Reset NVRAM
I'm unable to reset the Bluetooth module as Shift+Option and clicking on the Bluetooth menu in the menu bar does give me an options.


What other options do I have to troubleshoot this? If this is a hardware issue, do you have a recommendation for a Bluetooth USB adapter that I can use to limp by with?
If one reset of the SMC doesn't restore the function, you've done all the triage except for one last ditch option before hardware repair or dropping an USB BTLE adapter on.


Install a clean new 10.14 Mojave installation onto an external drive and let it update the firmware and then test without any user data migration or app installations. A total clean OS install can sometimes restore the drivers or state of the adapter if it's hung up and not a hardware issue.
Hardware repair is likely going to be costly so I've had very good luck with all manner of BTLE 4.0 dongles that use USB connectors. They cost $9 or so for good quality - try and look for one that says Mac compatible or buy from a company that accepts returns or can offer pre-sales assurance your chosen macOS will work. OWC is a good solid Mac centric vendor but I don't see them stocking, so this Amazon search should get you going: https://www.amazon.com/s/ref=nb_sb_ss_i_1_4?url=search-alias%3Daps&amp;field-keywords=btle+dongle