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Mitsubishi U1073

off b. U111C BMU CAN Timeout . FAIL-SAFE AND BACKUP FUNCTION  When the K-LINE is normal, use the K-LINE communication data. . PROBABLE CAUSES  The EV-ECU is failed.  The harness

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is recommended because the verified information identifies potential EV-ECU, BMU, and CAN-bus wiring/connector faults. Driveability and charging status are not established by verified evidence.
Confidence95%

Quick answer

For a 2016 Mitsubishi i-MiEV sold in the U.S., U1073 is identified in the verified Mitsubishi service information as a CAN-bus-off condition associated with EV-ECU monitoring. The information directs CAN-bus diagnosis with the Mitsubishi scan tool.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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DTC Mitsubishi U1073 Short ExplanationMaxidot Fiat

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1. What does U1073 mean?

For a 2016 Mitsubishi i-MiEV sold in the U.S., U1073 is identified in the verified Mitsubishi service information as a CAN-bus-off condition associated with EV-ECU monitoring. The information directs CAN-bus diagnosis with the Mitsubishi scan tool.

2. Technical explanation

Verified service information lists U1073 as “Bus-off” under EV-ECU diagnostic monitoring. The listed judgment condition is that three seconds have elapsed after the electric motor switch is turned ON, or three seconds have elapsed after main drive lithium-ion battery charging starts. The fail-safe/backup function states that, when K-LINE communication is normal, K-LINE communication data is used.

3. What system is affected?

EV-ECU communication monitoring; CAN bus communication; BMU communication.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • A U1073 diagnostic trouble code may be stored in the EV-ECU. Additional vehicle symptoms are not yet established by verified evidence.

6. Possible causes

  • EV-ECU failure.
  • Failure of CAN-bus harnesses or connectors.
  • BMU failure.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange professional diagnosis using the applicable Mitsubishi diagnostic procedures.
  • Do not attempt high-voltage battery, BMU, EV-ECU, CAN-harness, or connector repairs without qualified EV service training and procedures.

10. Step-by-step troubleshooting

  1. Use Mitsubishi scan tool MB991958 to perform CAN-bus diagnosis, as directed by the verified service information.
  2. Further diagnosis steps are not established by the supplied verified evidence.

11. When to contact service

Service is recommended because the verified information identifies potential EV-ECU, BMU, and CAN-bus wiring/connector faults. Driveability and charging status are not established by verified evidence.

12. What the service center may check

  • Perform CAN-bus diagnosis using scan tool MB991958.
  • Assess the EV-ECU, CAN-bus harnesses/connectors, and BMU according to applicable Mitsubishi procedures.

13. Possible repair or resolution

  • Not yet established by verified evidence. The verified source identifies possible EV-ECU, CAN-bus harness/connector, and BMU faults but does not establish the required repair for an individual vehicle.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA manufacturer communication PDF 10158410. The supplied evidence includes U1073 in its EV-ECU CAN diagnostic material.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified source: NHTSA-hosted Mitsubishi manufacturer communication, TSB-19-54-005 (MC-10158410-9999): https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

19. Frequently asked questions

What does U1073 mean on a 2016 Mitsubishi i-MiEV?

The verified Mitsubishi service information identifies U1073 as “Bus-off” in EV-ECU diagnostic monitoring.

What components can cause U1073?

The verified source lists the EV-ECU, CAN-bus harnesses/connectors, and BMU as probable causes.

Can U1073 prevent driving or charging?

Not yet established by verified evidence.

What is the specified diagnostic direction?

The verified source directs use of scan tool MB991958 to perform CAN-bus diagnosis.

20. Sources & verification

Verified
Mitsubishi U1073: off b. U111C BMU CAN Timeout . FAIL-SAFE AND BACKUP… | EV Diagnostics