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Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> Transmission >> Automatic Trans >> On-Board Diagnostic - Automatic Transaxle (Mm8AX-EC) >> DTC U0401-00: Can Communication: Error Signal Received From Pcm (Can Bus No. 2 Or At-Bus)

DTC U0401-00: Can Communication: Error Signal Received From Pcm (Can Bus No. 2 Or At-Bus)

System malfunction location CAN communication: Error signal received from PCM (CAN bus No. 2 or AT-bus)
Detection condition
  • The TCM receives an error signal from the PCM.

    Precondition 

  • Battery voltage is the standard or more.
Fail-safe
  • Inhibits manual mode.
  • Inhibits AAS.
Possible cause
  1. DTCs are stored in the PCM. (See DTC TABLE [PCM (PYUL)] .) DTC TABLE [PCM (H3T)] (See DTC TABLE [PCM (H3T)] .)
  2. Control valve body malfunction (TCM malfunction) (Refer to [CONTROL VALVE BODY REMOVAL/INSTALLATION ] in service information).
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