Thanks for the idea duxthe1. I did exactly as you described and unplugged the damping valves one by one and re scanned after each. No matter what valve is unplugged I still get the same codes listed at the start of this thread. Even though I just replaced the Left front damping valve with a new part directly from mercedes, I am still getting a code for it. What truly surprised me is that when I unplugged the one valve that isnt throwing a code, the Right rear, It didn't set a code.

Whatever my problem is, the damping valves being plugged in or unplugged doesn't seem to affect it at all. I still get the same codes, even after they are cleared. I can clear them and they stay cleared with the ignition in the acc position, but once the car is started, they are back instantly.

I dont know what else is left except the wiring harness and the ABC module itself. Unless another sensor could be contributing to this problem?

Does anybody know how I would go about testing the wiring harness or ABC module to determine which is bad? Id rather isolate the problem than throw parts at it. Do these modules have a history of going bad? How about the wiring harnesses for the ABC system on this year car?