CAT C15 J1939 not connecting Nexiq USB link 2

Hello
I have a C15 that I need to get the serial number from and my nexiq usb link 2 is not connecting.The adapter is fine as it connects to other engine makes fine. I'm getting can high and low from programming stub right about ecm. Using cat et 2015
Thanks!

 

Sorry for not replying. I tried another CAT and it won't respond either. The adapter is set up correctly with the same settings as other programs use like Insite, all which work nicely.
I am on RP1210 Compliant device and have Nexiq USB link 2 bluetooth selected as the device.
Its giving me error 275. (ERR_OPENING_PORT). I get this error whether I am connected to the truck or not..
Its a 2013 Freightiner Coronado, C15

 

The engine is reporting no faults, though I'm not seeing 60 Ohms across the can bus when powered off

 

Yes the adapter has the Bluetooth capability but I’ve always connected it straight to my computer with the USB cable, as I’ve done now.
I tried to set it as just the nexiq usb link 2 without WiFi or Bluetooth and it gives an adapter error.
Anything else I can try?

 

I disconnected the ground line from batteries to chassis. Key off and disconnected ground both gave a resistance of around 3.8k Ohms which is way too much.
The device tester was giving me the same error as Cat et was giving me,
and obviously no can messages going through of any kind. Tried all J1939 channels as well as Bluetooth version of nexiq and non-wifi,non-Bluetooth options, all which gave no messages.