Hi all. A lot has gone on with this issue and up to now, no real progress. I had the battery checked and it was in bad shape so I had that replaced. For a brief period, there were no further issues.....and then out of nowhere they were back on.
More research highlighted another place to check. Under the backseat is a J533 module that is responsible for all communication to all ECUs. I have taken the back seat off, disconnected the module, checked the grounding point was secure and plugged it all back in. Lights are clear and no codes, even better news is that I can't seem to trigger the issue by moving around on the seats. Not tempting fate just yet but so far, so good.
