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Home >> Mazda >> 2022 >> 3 Base >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> On-Board Diagnostics - Electronically Controlled Brake Unit (4 Of 4) >> DTC U2121-00: Communication Error With Vehicle Control Module (VCM) [Electronically Controlled Brake Unit] >> Outline

DTC U2121-00: Communication Error With Vehicle Control Module (VCM) [Electronically Controlled Brake Unit]: Outline

DTC U2121:00 (ELECTRONICALLY CONTROLLED BRAKE UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location Communication error with vehicle control module (VCM)
Detection condition
  • The electronically controlled brake unit cannot receive CAN signal from the vehicle control module (VCM).
Fail-safe Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT] .)
Possible cause
  • Malfunction in CAN communication line between vehicle control module (VCM) and electronically controlled brake unit
System wiring diagram Not applicable
Connector diagram Not applicable