Mitsubishi 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 BATTERY TSB Revision ELECTRIC MOTOR UNIT AND MAIN
Quick answer
U11AB is a Mitsubishi diagnostic trouble code for “CMU12 time-out” (also described as CMU12 CAN timeout). Verified evidence identifies it as a Battery Management Unit (BMU) and main drive lithium-ion battery diagnostic code.
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 U11AB mean?
U11AB is a Mitsubishi diagnostic trouble code for “CMU12 time-out” (also described as CMU12 CAN timeout). Verified evidence identifies it as a Battery Management Unit (BMU) and main drive lithium-ion battery diagnostic code.
2. Technical explanation
According to Mitsubishi material filed with NHTSA, U11AB is evaluated after three seconds have elapsed after the electric motor switch is turned ON, or after three seconds have elapsed after main drive lithium-ion battery charging starts. The supplied evidence does not establish the complete judgment criterion, root cause, or repair for this code.
3. What system is affected?
Battery Management Unit (BMU) and main drive lithium-ion battery; specifically, communication with CMU12.
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
- 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
- Have the vehicle assessed by a Mitsubishi-qualified EV service provider.
- Do not attempt high-voltage battery or battery-management-system repairs yourself.
10. Step-by-step troubleshooting
- Verified Mitsubishi service material instructs the technician to first determine whether the diagnostic trouble code is stored. If it is not stored, the check is complete.
- Further troubleshooting steps and diagnostic criteria are not established by the supplied verified evidence.
11. When to contact service
Service need is not yet established by verified evidence. Because this code concerns the BMU and main drive lithium-ion battery, arrange professional Mitsubishi EV diagnosis rather than attempting high-voltage work.
12. What the service center may check
- Confirm whether U11AB is currently stored.
- Evaluate the code using applicable Mitsubishi BMU/main drive lithium-ion battery service information. Additional specific checks are not established by the supplied evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Mitsubishi i-MiEV · 2012 · US
- Mitsubishi i-MiEV · 2014 · US
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-003, published March 13, 2019, includes U11AB as “CMU12 time-out.”
- Mitsubishi TSB-19-54-004, published March 13, 2019, includes U11AB as “CMU12 time-out.”
- Mitsubishi TSB-19-54-005, published March 13, 2019, includes U11AB as “CMU12 CAN Timeout.”
16. Recall information
- No recall information was supplied as verified evidence.
17. Official manufacturer information
Official source: NHTSA-hosted Mitsubishi manufacturer communications TSB-19-54-003, TSB-19-54-004, and TSB-19-54-005, published March 13, 2019.
19. Frequently asked questions
What does U11AB mean?
Verified Mitsubishi material defines U11AB as CMU12 time-out, also described as CMU12 CAN Timeout.
When can U11AB be evaluated?
The supplied Mitsubishi material states that the check conditions include three seconds after the electric motor switch is turned ON, or three seconds after main drive lithium-ion battery charging starts.
Can I drive or charge with U11AB?
Not yet established by verified evidence.