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Mitsubishi U11A9

CMU10 time-out, U11AA: CMU11 time-out, U11AB: CMU12 time-out . M S B - 1 7 M 5 4 _ 5 5 - 0 0 1 ( 1 7 A B 0 3 7 ) 1 6 1 BATTERY MANAGEMENT UNIT (BMU) AND MAIN DRIVE LITHIUM-ION BATT

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate because this code concerns BMU/main drive lithium-ion battery communication. Whether service is immediately required is not yet established by verified evidence.
Confidence95%

Quick answer

U11A9 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU10 communication time-out/CAN time-out. Verified applicability is 2012, 2014, and 2016 U.S.-market i-MiEV models.

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 U11A9 mean?

U11A9 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU10 communication time-out/CAN time-out. Verified applicability is 2012, 2014, and 2016 U.S.-market i-MiEV models.

2. Technical explanation

Official Mitsubishi service-bulletin material identifies U11A9 as “CMU10 time-out” or “CMU10 CAN Timeout.” The documented judgment condition is that three seconds have elapsed after the electric motor switch is turned ON, or three seconds after main drive lithium-ion battery charging begins. The supplied evidence does not establish a specific failed part or root cause for an individual vehicle.

3. What system is affected?

Battery Management Unit (BMU) and main drive lithium-ion battery; specifically communication with CMU10.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

Not yet established by verified evidence.

6. Possible causes

  • A CMU10 communication time-out/CAN time-out is established by verified evidence.
  • A specific underlying cause is not yet established by verified evidence.

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 by a Mitsubishi-qualified EV service facility.
  • Do not attempt high-voltage battery, CMU, BMU, or CAN-system repairs without appropriate training and procedures.

10. Step-by-step troubleshooting

  1. A Mitsubishi service procedure checks whether the DTC is stored/set after the specified judgment conditions.
  2. Further diagnostic steps and component-level conclusions are not established by the supplied verified evidence.

11. When to contact service

Service is appropriate because this code concerns BMU/main drive lithium-ion battery communication. Whether service is immediately required is not yet established by verified evidence.

12. What the service center may check

  • Confirm whether U11A9 is stored or set.
  • Assess the code under the documented conditions: at least three seconds after the electric motor switch is turned ON, or at least three seconds after main drive lithium-ion battery charging begins.
  • Use the applicable Mitsubishi service information for further diagnosis.

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, includes U11A9 as CMU10 time-out.
  • Mitsubishi TSB-19-54-004, published March 13, 2019, includes U11A9 as CMU10 time-out.
  • Mitsubishi TSB-19-54-005, published March 13, 2019, identifies U11A9 as CMU10 CAN Timeout.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Mitsubishi manufacturer communications: TSB-19-54-003 (MC-10158408), TSB-19-54-004 (MC-10158409), and TSB-19-54-005 (MC-10158410), all published March 13, 2019.

19. Frequently asked questions

What does Mitsubishi i-MiEV code U11A9 mean?

It means CMU10 time-out or CMU10 CAN Timeout in the BMU/main drive lithium-ion battery system.

Which vehicles are verified as applicable?

U.S.-market Mitsubishi i-MiEV model years 2012, 2014, and 2016 are supported by the supplied evidence.

Can I continue driving or charging with U11A9?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi U11A9: CMU10 time-out, U11AA: CMU11 time-out, U11AB: CMU12… | EV Diagnostics