DTC U212B-00: Communication Error With Body Control Module (BCM) [Dash-Electrical Supply Unit]: 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 U212B:00 [DASH-ELECTRICAL SUPPLY UNIT] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with body control module (BCM)
Detection condition	The dash-electrical supply unit cannot receive CAN signal from the body control module (BCM).
Fail-safe	The value of the data which is not received from the body control module (BCM) is fixed at the specified value.
Possible cause	Malfunction in CAN communication line between body control module (BCM) and dash-electrical supply unit
System wiring diagram	Not applicable
Connector diagram	Not applicable