Well guess what. System voltage 12.1 V at idle (measured with my Fluke 87 at the jump start lug under the hood). Alternator time! I got 248k miles, not bad for the original alternator.

I suspect that the system voltage crashed while driving thus taking down the whole network.

With the car on a battery charger, all the engine CAN bus nodes (ABS, ETC, IFI, IC) report as healthy (ERE, Actual Values).

I do have an interior can bus issue that I have to run down but I don't think that's the issue with the engine control.

I found the screen in the HHT emulator (EZS, Actuations) that gives the run down on the whole body CAN network, and I have a CAN-H fault except when DCM3 (rear drivers door) module is unplugged from the harmonica.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech