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Home >> Mazda >> 2024 >> 3 Carbon Turbo, 4D Hatchback >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> On-Board Diagnostics - CMU (2 Of 2) >> DTC U0140-00: Communication Error With Body Control Module (BCM)

DTC U0140-00: Communication Error With Body Control Module (BCM)

U0140-00: (CMU) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location Communication error with body control module (BCM)
Detection condition
  • The connectivity master unit (CMU) detects a communication interruption or communication error with the body control module (BCM).
Fail-safe
  • The connectivity master unit (CMU) is put in sleep mode and it does not launch.
Possible cause
  1. Malfunction in CAN communication line between body control module (BCM) and connectivity master unit (CMU)
    NOTE:
  2. Connectivity master unit (CMU) malfunction (Refer to CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION in service information.)
  3. Body control module (BCM) malfunction (Refer to BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION in service information.)
Repeatability verification procedure
  • Not applicable
System wiring diagram
  • Not applicable