DTC U0140-00: Communication Error With Body Control Module (BCM) (Telematics Communication 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 U0140:00 (TELEMATICS COMMUNICATION UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with body control module (BCM)
Detection condition	The telematics communication unit cannot receive a CAN signal from the body control module (BCM).
Fail-safe	Not applicable
Possible cause	Malfunction in CAN communication line between the body control module (BCM) and telematics communication unit Telematics communication unit malfunction Body control module (BCM) malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable