July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

DTC U0073: Can Bus Off: Notes

WARNING: This page is about a different car, the 2004 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC U0073 Detection Condition & Possible Causes Chart

Courtesy of MAZDA MOTORS CORP.