DTC U0164-00: Communication Error With Dash-Electrical Supply Unit (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 U0164:00 (TELEMATICS COMMUNICATION UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with dash-electrical supply unit
Detection condition	The telematics communication unit cannot receive a CAN signal from the dash-electrical supply unit.
Fail-safe	Not applicable
Possible cause	Malfunction in CAN communication line between the dash-electrical supply unit and telematics communication unit Dash-electrical supply unit malfunction Telematics communication unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable