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I dont know if its helpful here or not, but I just had a similar issue where the car was reading a ton of codes for comm faults in the canbus - the issue turned out to be a bad RDC/TPMS module. They found the issue by unplugging each module in the car, clearing codes, and then seeing if they came back. With the RDC/TPMS unplugged the codes would clear.
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