Mitsubishi P101B
Return to Step 1. NO : The diagnosis is complete. DTC P101C Quick CHG. Contactor N Weld DANGER When servicing the high voltage system parts, always shut off the high voltage by r
Quick answer
P101B is documented in Mitsubishi bulletin TSB-19-54-005 for the 2016 US i-MiEV. The supplied evidence shows a confirmation step: erase the DTC, connect the quick-charge connector to charge the battery completely, then check whether P101B resets. If it resets, the bulletin directs technicians to return to Step 1; if it does not, the diagnosis is complete.
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 P101B mean?
P101B is documented in Mitsubishi bulletin TSB-19-54-005 for the 2016 US i-MiEV. The supplied evidence shows a confirmation step: erase the DTC, connect the quick-charge connector to charge the battery completely, then check whether P101B resets. If it resets, the bulletin directs technicians to return to Step 1; if it does not, the diagnosis is complete.
2. Technical explanation
The supplied official bulletin excerpt identifies P101B as a DTC checked in the EV-ECU during a quick-charging-related diagnostic procedure. The excerpt’s Step 12 instructs: erase the stored DTC, connect the quick-charging connector and charge the battery completely, then check whether the DTC is set again. A recurring P101B requires continuing the bulletin’s diagnostic process from Step 1. The meaning of P101B beyond this documented procedure is not yet established by verified evidence.
3. What system is affected?
EV-ECU and the quick-charging diagnostic procedure. A more specific affected component or system is not yet established by verified evidence.
4. How serious is this code?
Unknown. The supplied verified evidence does not assign a severity level to P101B.
5. Symptoms you may notice
- A P101B DTC stored in the EV-ECU.
- Additional vehicle symptoms are not yet established by verified evidence.
6. Possible causes
- Not yet established by verified evidence. The supplied bulletin excerpt provides a diagnostic confirmation step but does not identify the root cause of P101B.
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. The bulletin specifically uses connection of the quick-charging connector and a complete charge as part of its diagnostic confirmation procedure.
9. What you can safely do
- Have diagnosis performed by qualified personnel using the applicable Mitsubishi service information.
- High-voltage-system service requires high-voltage shutdown by removing the service plug, as stated in the supplied bulletin.
- Do not perform high-voltage repairs unless qualified and following the manufacturer procedure.
10. Step-by-step troubleshooting
- The official bulletin’s Step 12 directs technicians to check the EV-ECU for a repeat DTC after clearing it.
- Erase the set DTC.
- Connect the quick-charging connector and charge the battery completely.
- Check whether P101B is set again.
- If P101B is set again, return to Step 1 of TSB-19-54-005.
- If P101B is not set again, the bulletin states that the diagnosis is complete.
11. When to contact service
Service is appropriate because the official procedure concerns the EV-ECU, quick charging, and high-voltage-system precautions. The supplied evidence does not establish whether immediate service is required.
12. What the service center may check
- Check for P101B in the EV-ECU.
- Clear the DTC and perform the bulletin’s complete quick-charge confirmation procedure.
- Determine whether P101B returns after the charge.
- If the code returns, continue at Step 1 of TSB-19-54-005.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied excerpt contains a confirmation step only and does not provide the earlier diagnostic steps or a repair instruction for P101B.
14. Affected vehicles
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-005, published through NHTSA as Manufacturer Communication PDF 10158410 on March 13, 2019. The supplied excerpt documents Step 12 for checking whether P101B resets after clearing the DTC and completing a quick charge.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official source: NHTSA Manufacturer Communication PDF 10158410, Mitsubishi TSB-19-54-005: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf
19. Frequently asked questions
What vehicle does the supplied evidence apply to?
2016 Mitsubishi i-MiEV vehicles in the United States.
What does the bulletin say to do if P101B returns?
The supplied Step 12 says to return to Step 1 if P101B is set again after clearing the DTC, connecting the quick-charging connector, charging the battery completely, and rechecking the EV-ECU.
What if P101B does not return after the confirmation procedure?
The supplied bulletin excerpt states that the diagnosis is complete.
Is P101B confirmed to mean a welded contactor?
No. The excerpt transitions from the P101B confirmation step into a separate heading for DTC P101C, “Quick CHG. Contactor N Weld.” The supplied evidence does not establish that description as the meaning of P101B.