Update:
I let the X5 return to ambient temperature and went back to check status. ISTA was immediately able to identify and communicate with the car and its modules. I was able to clear the codes pictured above. After the vehicle re-test, I was left with only one code within the DSC unit, seen here as the 5A code for Brief Power Interruption. Apparently the module cannot be read due to the existing power loss.



I find it hard to believe but I suppose it is possible that I could be experiencing a DSC/ABS module failure, as coincidental as it may be. I may have jarred it just enough during the repair to finish off some of the internal contacts.


Now, from what I understand about the CAN BUS communication system, all units within each CAN network produce their own voltage through the network. With the IKE as the root unit and communicating to all CAN systems, if the DSC unit has an internal short across the CAN/H CAN/L, it can potentially disrupt all CAN communications within all networks. I'm not sure how feasible this scenario is but is my thinking on the right track?

I know that if the trans (AGS) does not receive its needed signals from wheel speed sensors etc it will go into TRANS PROG FAILSAFE, so again it leads me back to the DSC/ABS being at the center of the issue.

Could really use some feedback.