DTC U0140-00: Can Communication: Communication Error To Body Control Module (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 U0140:00 (PCM, SKYACTIV-G, US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	CAN communication: communication error to body control module (BCM)
Detection condition	Communication error between the PCM and body control module (BCM) continues for 5 s or more.
Fail-safe	Not applicable
Possible cause	CAN communication line malfunction between PCM and body control module (BCM) Body control module (BCM) malfunction PCM malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable