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Mitsubishi U11A8

CMU09 time-out, 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

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService need is not explicitly established by the supplied evidence; however, diagnosis should be performed by a qualified Mitsubishi EV service provider because this code concerns BMU/main drive lithium-ion battery communication.
Confidence95%

Quick answer

U11A8 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU09 time-out/CAN timeout. Verified evidence applies it to certain U.S. 2012, 2014, and 2016 i-MiEV vehicles.

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 U11A8 mean?

U11A8 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU09 time-out/CAN timeout. Verified evidence applies it to certain U.S. 2012, 2014, and 2016 i-MiEV vehicles.

2. Technical explanation

Mitsubishi service information identifies U11A8 as “CMU09 time-out” and “CMU09 CAN Timeout.” The listed judgment conditions include 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 begins. The source also states that U1082 local CAN is not stored as part of the trouble-judgment conditions.

3. What system is affected?

Battery Management Unit (BMU) and main drive lithium-ion battery communication, specifically CMU09 communication.

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 CMU09 time-out/CAN timeout is established by verified evidence. The supplied evidence does not establish a specific underlying component failure or wiring cause.
  • The source identifies U1082 local CAN status as relevant to the trouble judgment, but does not establish a cause for U11A8 in the supplied 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

  • Do not attempt high-voltage battery or battery-management repairs yourself.
  • Arrange diagnosis using applicable Mitsubishi service information if U11A8 is stored or set.

10. Step-by-step troubleshooting

  1. Verified Mitsubishi procedure begins by confirming whether the DTC is stored or set after turning the electric motor switch from OFF to ON. If it is not stored or set, the check ends.
  2. The supplied evidence does not provide the subsequent diagnostic steps, measurements, or component-level test criteria.

11. When to contact service

Service need is not explicitly established by the supplied evidence; however, diagnosis should be performed by a qualified Mitsubishi EV service provider because this code concerns BMU/main drive lithium-ion battery communication.

12. What the service center may check

  • Confirm whether U11A8 is stored or set after switching the electric motor switch OFF to ON, following the applicable Mitsubishi procedure.
  • Review whether the code meets the documented timing conditions: three seconds after electric motor switch ON or three seconds after main drive lithium-ion battery charging starts.
  • Check the diagnostic context for U1082 local CAN as specified in the documented trouble-judgment conditions.

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 U11A8 as CMU09 time-out.
  • Mitsubishi TSB-19-54-004, published March 13, 2019, includes U11A8 as CMU09 time-out.
  • Mitsubishi TSB-19-54-005, published March 13, 2019, identifies U11A8 as CMU09 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 (https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf), TSB-19-54-004 (https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf), and TSB-19-54-005 (https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf).

19. Frequently asked questions

What does U11A8 mean on a Mitsubishi i-MiEV?

It means CMU09 time-out, also described as CMU09 CAN Timeout, in the BMU and main drive lithium-ion battery system.

Which vehicles are covered by the verified applicability data?

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

When can U11A8 be judged by the BMU?

The listed conditions include three seconds after the electric motor switch is turned ON or three seconds after main drive lithium-ion battery charging begins, with U1082 local CAN not stored.

Is it safe to drive or charge with U11A8?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi U11A8: CMU09 time-out, U11A9: CMU10 time-out, U11AA: CMU11… | EV Diagnostics