Mitsubishi U1116
MEDIC must remain connected during the cell smoothing procedure (approximately 2 hours). Ensure MEDIC is fully charged or connected to a charging cable. 1. Turn the electric motor
Quick answer
For 2012–2013 Mitsubishi i-MiEV vehicles in the US, verified evidence associates U1116 with the MEDIC diagnostic tool needing to remain connected during the approximately two-hour cell-voltage-smoothing procedure. The evidence does not establish a normal driving fault description for this 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 U1116 mean?
For 2012–2013 Mitsubishi i-MiEV vehicles in the US, verified evidence associates U1116 with the MEDIC diagnostic tool needing to remain connected during the approximately two-hour cell-voltage-smoothing procedure. The evidence does not establish a normal driving fault description for this code.
2. Technical explanation
Mitsubishi service bulletin SB-17-54-003 states that MEDIC must remain connected during cell voltage smoothing, which takes approximately two hours. MEDIC must be fully charged or connected to a charging cable. The bulletin also states that cell voltage smoothing will not start with certain active DTCs; active DTCs other than U1111 and U1116 must be troubleshot before the procedure.
3. What system is affected?
Cell voltage smoothing procedure / Main Drive battery service procedure. A more specific vehicle-system assignment is not yet established by verified evidence.
4. How serious is this code?
Unknown. Verified evidence does not assign a severity level to U1116.
5. Symptoms you may notice
- The verified bulletin identifies U1116 in connection with the cell voltage smoothing procedure.
- Vehicle operating symptoms are not yet established by verified evidence.
6. Possible causes
- During cell voltage smoothing, MEDIC was not kept connected, was not fully charged, or was not connected to a charging cable. This is established only in the context of the documented service procedure.
- Other causes are 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?
Do not charge the Main Drive battery while performing the documented cell voltage smoothing procedure. If it is charging, the bulletin instructs disconnecting the charging cable before proceeding. Outside that procedure, charging status for U1116 is not yet established by verified evidence.
9. What you can safely do
- If this code is being addressed as part of cell voltage smoothing, follow the official Mitsubishi procedure using MEDIC.
- Do not charge the Main Drive battery while the cell voltage smoothing procedure is being performed.
- Ensure MEDIC remains connected for the approximately two-hour procedure and is fully charged or connected to a charging cable.
- Have active DTCs other than U1111 and U1116 troubleshot before attempting cell voltage smoothing.
10. Step-by-step troubleshooting
- Confirm whether U1116 was recorded during an attempted cell voltage smoothing procedure.
- For that procedure, confirm MEDIC remained connected and had adequate power through its own charge or charging cable.
- Check for active DTCs. Mitsubishi states that active DTCs other than U1111 and U1116 must be troubleshot before cell voltage smoothing can proceed.
- Further diagnostic steps are not yet established by verified evidence.
11. When to contact service
Service involvement is not explicitly classified by the supplied evidence. Because the verified information concerns a Mitsubishi diagnostic procedure for the Main Drive battery, use the official Mitsubishi service procedure or a qualified service provider.
12. What the service center may check
- Determine whether cell voltage smoothing is required and whether U1116 is present in that procedure context.
- Verify MEDIC connection and power supply throughout the approximately two-hour smoothing process.
- Identify and troubleshoot active DTCs other than U1111 and U1116 before attempting cell voltage smoothing.
13. Possible repair or resolution
- No component replacement or repair resolution is established by the supplied verified evidence.
- For the documented procedure, maintaining MEDIC connection and power is required while cell voltage smoothing runs.
14. Affected vehicles
- Mitsubishi i-MiEV · 2012–2013 · US
15. Related TSBs / service bulletins
- Mitsubishi SB-17-54-003, published through NHTSA on July 26, 2017, documents cell voltage smoothing and references U1116.
- NHTSA manufacturer communication PDFs: MC-10116253-9999 and MC-10115257-9999.
- Source: https://static.nhtsa.gov/odi/tsbs/2017/MC-10116253-9999.pdf
16. Recall information
- No recall information is supplied in the verified evidence.
17. Official manufacturer information
Applicability established by the supplied evidence: 2012–2013 Mitsubishi i-MiEV, US market. Official source: Mitsubishi SB-17-54-003 as published by NHTSA on July 26, 2017.
19. Frequently asked questions
What does U1116 mean for a Mitsubishi i-MiEV?
The supplied Mitsubishi bulletin associates U1116 with keeping the MEDIC diagnostic tool connected during the approximately two-hour cell voltage smoothing procedure, with MEDIC fully charged or connected to a charging cable.
Can the Main Drive battery be charged during cell voltage smoothing?
No. Mitsubishi SB-17-54-003 states not to charge the Main Drive battery during the procedure and to disconnect the charging cable if the battery is being charged.
Will cell voltage smoothing start if other DTCs are active?
The bulletin states that cell voltage smoothing will not start when certain DTCs are active. It instructs technicians to troubleshoot active DTCs other than U1111 and U1116 before performing the procedure.
How long does cell voltage smoothing take?
The verified bulletin states that the procedure takes approximately two hours.