LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> Transmission >> Automatic Trans >> On-Board Diagnostic - Automatic Transaxle (Mm8AX-EC) >> DTC U04C0-00: Can Communication: Error Signal Received From Backup Power Supply Unit (At-Bus)

DTC U04C0-00: Can Communication: Error Signal Received From Backup Power Supply Unit (At-Bus)

System malfunction location CAN communication: Error signal received from backup power supply unit (AT-bus)
Detection condition
  • The TCM receives an error signal from the backup power supply unit.

    Precondition 

  • Battery voltage is the standard or more.
Fail-safe
  • Not applicable
Possible cause
  1. DTCs are stored in the backup power supply unit. (See DTC TABLE [BPS] .)
Repeatability verification procedure
  1. Clear the DTC recorded in the memory. (See CLEARING DTC .)
  2. Perform the following procedure to ensure that the DTC has been resolved:
    • Drive the vehicle. (Use all gears from 1st to 8th gear)
System wiring diagram
  • Not applicable
scientia non olet · About LEMON Manuals