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

DTC U0100: Engine CAN timeout: Notes

WARNING: This page is about a different car, the 2017 Mitsubishi Mirage G4. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

If DTC No. U0100 is stored, be sure to diagnose the CAN bus line.
When replacing the ECU, always check that the communication circuit is normal.