OBDII Port completely dead - which control module presents this interface?

[jeffm333]

2013 Suburban Z71. OBDII port completely dead - won't power on generic scan tools. VXCNano is ordered, but I'm expecting it to also see nothing as the port appears completely dead, regardless of the key position in the ignition switch.

I thought that the Body Control Module (BCM) would be the critical device for hosting and presenting data on the OBDII port under the dash, but in all of my research, reading, youtube-watching, and talking with a mechanic, there have been a few bits of input indicating it isn't that simple, and that a dead OBDII port may be due to ECM issues or other issues as well.

Can someone confirm/deny this? Or have any other input?

 

[Doubeleive]

2013 Suburban Z71. OBDII port completely dead - won't power on generic scan tools. VXCNano is ordered, but I'm expecting it to also see nothing as the port appears completely dead, regardless of the key position in the ignition switch.

I thought that the Body Control Module (BCM) would be the critical device for hosting and presenting data on the OBDII port under the dash, but in all of my research, reading, youtube-watching, and talking with a mechanic, there have been a few bits of input indicating it isn't that simple, and that a dead OBDII port may be due to ECM issues or other issues as well.

Can someone confirm/deny this? Or have any other input?

check that you have power at the cigarette power plug, if the port is dead then the fuse is blown and that fuse also provides the DATA power for the obd port, this is separate from the 12v power & ground that is at the obd port already

 

[Doubeleive]

you can also use a meter and check pin 16 & 4, 16 should be 12v and 4 should be ground, if not then there is a different problem. those pins are power only, not for data