DTC U0155-00: Communication Error To Instrument Cluster (TCM) (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 U0155:00 (TCM, ET6A-EL, ET6AX-EL, US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error to instrument cluster
Detection condition	Under the following condition, the TCM cannot receive the signal from instrument cluster: Battery voltage is 10 V or more.
Fail-safe	Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control.
Possible cause	CAN communication line malfunction between TCM and instrument cluster TCM malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable