DTC U0401[00] Communication Failure With ECM/PCM (Parking Aid)

1. Parking aid system check

Refer to "75.Driver Assistance System 10W.Troubleshooting(Parking Aid) diagnostic system check - parking aid system controls".

2. Prioritized DTC check

1) Connect the scan tool.

2) Turn ON the ignition switch.

3) Observe the ECM DTC information with a scan tool. Is a DTC set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Repair verification.

3. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 30 seconds or more.

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool.