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Mitsubishi U11A1

CMU02 time-out, U11A2: CMU03 time-out, U11A3: CMU04 time-out, U11A4: CMU05 time-out, U11A5: CMU06 time-out, U11A6: CMU07 time-out, U11A7: CMU08 time-out, U11A8: CMU09 time-out, U11

DriveUnknown. Whether the vehicle can be driven with U11A1 is not established by verified evidence.
ChargeUnknown. Whether the vehicle can be charged with U11A1 is not established by verified evidence.
ServiceContact a Mitsubishi dealer or qualified EV service provider for diagnosis, particularly if U11A1 returns after code clearing and an OFF-to-ON switch cycle.
Confidence95%

Quick answer

U11A1 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU02 time-out/CAN time-out. Official Mitsubishi service communications describe checking whether the code returns after it is erased and the electric motor switch is cycled from LOCK (OFF) to ON.

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 U11A1 mean?

U11A1 is a Mitsubishi i-MiEV Battery Management Unit (BMU) diagnostic trouble code for a CMU02 time-out/CAN time-out. Official Mitsubishi service communications describe checking whether the code returns after it is erased and the electric motor switch is cycled from LOCK (OFF) to ON.

2. Technical explanation

The supplied official service-bulletin evidence identifies U11A1 as “CMU02 time-out” and “CMU02 CAN Timeout.” The trouble-judgment condition states that three seconds elapse after the electric motor switch is turned ON. The verified evidence does not establish the underlying fault cause, vehicle behavior, or a specific repair for U11A1 alone.

3. What system is affected?

Battery Management Unit (BMU) communication with CMU02. The full meaning of “CMU” is not established by the supplied verified evidence.

4. How serious is this code?

Unknown. Severity is not established by verified evidence.

5. Symptoms you may notice

  • A U11A1 diagnostic trouble code may be stored or set in the BMU. No driver-visible symptoms are established by the supplied verified evidence.

6. Possible causes

  • Not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. Whether the vehicle can be driven with U11A1 is not established by verified evidence.

8. Can I charge the vehicle?

Unknown. Whether the vehicle can be charged with U11A1 is not established by verified evidence.

9. What you can safely do

  • Arrange diagnosis by a qualified Mitsubishi EV service provider.
  • Do not attempt high-voltage battery, BMU, CMU, or communication-system repair yourself.

10. Step-by-step troubleshooting

  1. The official service communications instruct technicians to erase stored diagnostic trouble codes, cycle the electric motor switch from LOCK (OFF) to ON, and confirm whether the code is stored or set again.
  2. If the code does not return after this confirmation procedure, the cited service communications state that the check is complete.
  3. If the code returns, the supplied evidence directs the technician to continue the applicable diagnostic procedure; the subsequent steps are not provided in the supplied evidence.

11. When to contact service

Contact a Mitsubishi dealer or qualified EV service provider for diagnosis, particularly if U11A1 returns after code clearing and an OFF-to-ON switch cycle.

12. What the service center may check

  • Confirm the code is present in the BMU.
  • Erase the stored or set diagnostic trouble codes.
  • Cycle the electric motor switch from LOCK (OFF) to ON.
  • Reconfirm whether U11A1 is stored or set after the switch cycle.

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; available through NHTSA manufacturer communication MC-10158408-9999: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf
  • Mitsubishi TSB-19-54-004, published March 13, 2019; available through NHTSA manufacturer communication MC-10158409-9999: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
  • Mitsubishi TSB-19-54-005, published March 13, 2019; available through NHTSA manufacturer communication MC-10158410-9999: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability is Mitsubishi i-MiEV vehicles in the United States for model years 2012, 2014, and 2016. The cited official NHTSA-hosted Mitsubishi service communications identify U11A1 as CMU02 time-out/CMU02 CAN Timeout.

19. Frequently asked questions

What does Mitsubishi i-MiEV code U11A1 mean?

It means CMU02 time-out; another official service communication describes it as CMU02 CAN Timeout.

When can U11A1 be judged or set?

The supplied official evidence states a check condition of three seconds after the electric motor switch is turned ON.

How does the official procedure verify U11A1?

It erases the code, cycles the electric motor switch from LOCK (OFF) to ON, and checks whether the code returns.

Which vehicles are verified as applicable?

Mitsubishi i-MiEV models for 2012, 2014, and 2016 in the United States.

Is U11A1 safe to drive or charge with?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi U11A1: CMU02 time-out, U11A2: CMU03 time-out, U11A3: CMU04… | EV Diagnostics