DTC U2139-00: Communication Error With Rear Side Radar Sensor (RH) [Vehicle Control Module]: Outline

WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC U2139:00 [VEHICLE CONTROL MODULE] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with rear side radar sensor (RH)
Detection condition	The vehicle control module (VCM) cannot receive CAN signal from the rear side radar sensor (RH) for 10 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (US)] .)
Possible cause	Power is not supplied from vehicle control module (VCM) to rear side radar sensor (RH) Malfunction in CAN communication line between vehicle control module (VCM) and rear side radar sensor (RH) Rear side radar sensor (RH) malfunction Vehicle control module (VCM) malfunction
System wiring diagram	Not applicable