LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2018 >> CX-3 Touring, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (On-Board Diagnostic - 360 Degrees View Monitor Control Module) >> DTC U0401-00: Error Signal Received From Pcm >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

WARNING: This page is about a different car, the 2018 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.
DTC U0401:00 (360°VIEW Monitor Control Module) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY OTHER 360°VIEW MONITOR CONTROL MODULE DTCs Yes Replace the 360°view monitor control module, then go to Step 4.
(See 360°VIEW MONITOR CONTROL MODULE REMOVAL/INSTALLATION .)
No Go to the next step.
2 VERIFY PCM DTCs Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)] .)
No Go to the next step.
3 VERIFY IF MALFUNCTIONING LOCATION IS PCM DEPENDING ON REPEATABILITY Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
No Go to Step 5.
4 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
5 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE (360°VIEW Monitor Control Module) .)
No DTC troubleshooting completed.