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Mitsubishi U11A3

CMU04 time-out, U11A4: CMU05 time-out, U11A5: CMU06 time-out, U11A6: CMU07 time-out, U11A7: CMU08 time-out, U11A8: CMU09 time-out, U11A9: CMU10 time-out, U11AA: CMU11 time-out, U11

DriveUnknown. Verified evidence does not establish whether the vehicle is safe to drive with U11A3.
ChargeUnknown. Verified evidence does not establish whether the vehicle is safe to charge with U11A3.
ServiceService is advisable because U11A3 is a BMU communication timeout code. Whether service is mandatory is not established by the supplied verified evidence.
Confidence95%

Quick answer

U11A3 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU04 time-out/CAN timeout.

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

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1. What does U11A3 mean?

U11A3 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU04 time-out/CAN timeout.

2. Technical explanation

Verified Mitsubishi service-bulletin evidence identifies U11A3 as “CMU04 time-out” or “CMU04 CAN Timeout.” The code is set in the BMU. The supplied evidence states that the relevant check condition includes three seconds after the electric motor switch is turned ON, or three seconds after the Main Drive system condition referenced in the bulletin. The supplied excerpt does not establish a component-level root cause.

3. What system is affected?

Battery Management Unit (BMU) communication with CMU04. The full expansion of CMU is not established by the supplied verified evidence.

4. How serious is this code?

Unknown. Verified evidence does not assign a severity level.

5. Symptoms you may notice

  • A U11A3 diagnostic trouble code stored or set in the BMU.

6. Possible causes

  • Not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. Verified evidence does not establish whether the vehicle is safe to drive with U11A3.

8. Can I charge the vehicle?

Unknown. Verified evidence does not establish whether the vehicle is safe to charge with U11A3.

9. What you can safely do

  • Arrange diagnosis by a Mitsubishi-capable EV service provider.
  • Do not attempt high-voltage battery, CMU, BMU, or related electrical repairs yourself.
  • Record the stored code and any accompanying diagnostic trouble codes for the service provider.

10. Step-by-step troubleshooting

  1. The Mitsubishi bulletin procedure directs that stored/set diagnostic trouble codes be erased, the electric motor switch be changed from LOCK (OFF) to ON, and the codes then be checked again.
  2. If U11A3 is no longer stored or set after that confirmation procedure, the bulletin excerpt states that the check is complete.
  3. If U11A3 remains stored or set, the supplied evidence indicates the procedure continues to Step 1, but the contents of that step are not included in the supplied evidence.

11. When to contact service

Service is advisable because U11A3 is a BMU communication timeout code. Whether service is mandatory is not established by the supplied verified evidence.

12. What the service center may check

  • Confirm U11A3 in the BMU using appropriate diagnostic equipment.
  • Follow the applicable Mitsubishi bulletin diagnostic procedure, including code erasure, electric motor switch OFF-to-ON cycling, and confirmation of whether the code returns.
  • Further service checks are not established by the supplied excerpt.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-003, published March 13, 2019; NHTSA manufacturer communication MC-10158408. It lists U11A3 as CMU04 time-out.
  • Mitsubishi TSB-19-54-004, published March 13, 2019; NHTSA manufacturer communication MC-10158409. It lists U11A3 as CMU04 time-out.
  • Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA manufacturer communication MC-10158410. It lists U11A3 as CMU04 CAN Timeout.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability is Mitsubishi i-MiEV models for the US market in model years 2012, 2014, and 2016. Official source documents: NHTSA-hosted Mitsubishi TSB-19-54-003, TSB-19-54-004, and TSB-19-54-005, all published March 13, 2019.

19. Frequently asked questions

What does U11A3 mean on a Mitsubishi i-MiEV?

It means CMU04 time-out, also described as CMU04 CAN Timeout, in the BMU diagnostic information.

When can U11A3 be set?

The supplied Mitsubishi bulletin evidence states a relevant condition is three seconds after the electric motor switch is turned ON, or three seconds after the Main Drive system condition referenced in the bulletin.

Can I drive or charge with U11A3?

Not yet established by verified evidence.

Which vehicles are verified as applicable?

US-market Mitsubishi i-MiEV model years 2012, 2014, and 2016.

20. Sources & verification

Verified
Mitsubishi U11A3: CMU04 time-out, U11A4: CMU05 time-out, U11A5: CMU06… | EV Diagnostics