DTC U0101-00: Communication Error With TCM (BCM) (Us): Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0101:00 (BCM) (US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with TCM
Detection condition	The body control module (BCM) cannot receive CAN signal from the TCM.
Fail-safe	Sets to default signal.
Possible cause	Malfunction in CAN communication line between TCM and body control module (BCM)
System wiring diagram	Not applicable