DTC U2126-00: Communication Error With Parking Assist Unit (Ultrasonic) [Vehicle Control Module]: 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 U2126:00 (VEHICLE CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with parking assist unit (ultrasonic)
Detection condition	The vehicle control module (VCM) cannot receive CAN signal from parking assist unit (ultrasonic) for 10 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (US)] .)
Possible cause	Power is not supplied from vehicle control module (VCM) Malfunction in CAN communication line between vehicle control module (VCM) and parking assist unit (ultrasonic) Parking assist unit (ultrasonic) malfunction Vehicle control module (VCM) malfunction (built into body control module (BCM))
System wiring diagram	Not applicable