DTC U0401:00

id060200812200

DTC U0401:00	CAN system communication error
DETECTION CONDITION	•  Error detected in signal from PCM via CAN communication
FAIL-SAFE FUNCTION	•  Vehicle speed signal malfunction ―  Control is maintained by gradually changing the controlled vehicle speed and setting it to 120 km/h {74.6 mph} ―  Power steering malfunction indicator light: Illuminated •  Engine speed signal malfunction ―  Control enabled ―  Power steering malfunction indicator light: Not illuminated •  i-stop status signal malfunction ―  EPS i-stop control is not operated, and normal control is maintained ―  Power steering malfunction indicator light: Not illuminated
POSSIBLE CAUSE	•  PCM malfunction
SYSTEM WIRING DIAGRAM	—

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT FOR PCM MALFUNCTION •  Using the M-MDS, perform the DTC inspection for the PCM. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) •  Are any DTCs detected?	Yes	Go to applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].) DTC troubleshooting completed, then go to the next step.
		No	Go to the next step.
2	VERIFY DTC TROUBLESHOOTING COMPLETED •  Clear the DTC from the memory. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS.) •  Is the same DTC present? (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS.)	Yes	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
		No	DTC troubleshooting completed.