Mitsubishi P1AFF
ECU. (1) Erase the stored DTC. (2) Connect the quick charging connector to charg e the battery fully. (3) Check if the DTC is stored. Q: Is the DTC stored? YES <DTC P1AFA> : Go to
Quick answer
P1AFF is a Mitsubishi EV-ECU diagnostic trouble code covered by official Mitsubishi service bulletins for certain U.S.-market i-MiEV vehicles. The verified procedure requires a DTC recheck after CAN bus lines are reset: erase the DTC, connect the quick-charging connector and charge the battery fully, then check whether the DTC returns. If P1AFF remains stored, the bulletin directs the technician to a later diagnostic step.
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 P1AFF mean?
P1AFF is a Mitsubishi EV-ECU diagnostic trouble code covered by official Mitsubishi service bulletins for certain U.S.-market i-MiEV vehicles. The verified procedure requires a DTC recheck after CAN bus lines are reset: erase the DTC, connect the quick-charging connector and charge the battery fully, then check whether the DTC returns. If P1AFF remains stored, the bulletin directs the technician to a later diagnostic step.
2. Technical explanation
Verified Mitsubishi service information groups P1AFF with P1AFA, P1AFE, and P1B00 during an EV-ECU DTC recheck after resetting CAN bus lines. After clearing the stored code and fully charging through the quick-charging connector, a returned P1AFF directs the technician to Step 15 in TSB-19-54-003/004 or Step 17 in TSB-19-54-005. The supplied evidence does not establish the exact component fault, root cause, or final repair for P1AFF.
3. What system is affected?
EV-ECU; the verified procedure also references CAN bus lines and the quick-charging connector.
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. The official bulletins require further diagnosis if P1AFF returns after the specified recheck.
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 official diagnostic procedure specifically calls for connecting the quick-charging connector and fully charging the battery as part of the recheck.
9. What you can safely do
- Have diagnosis performed by a qualified Mitsubishi EV service technician.
- Use the applicable official diagnostic procedure; do not attempt high-voltage or connector testing yourself.
- Record whether P1AFF returns after the prescribed diagnostic recheck.
10. Step-by-step troubleshooting
- Official technician procedure: erase the stored DTC.
- Connect the quick-charging connector and charge the battery fully/completely.
- Check whether P1AFF is stored or set again in the EV-ECU.
- If P1AFF does not return, the cited bulletin states that the diagnosis is complete.
- If P1AFF returns, proceed to Step 15 of TSB-19-54-003 or TSB-19-54-004, or Step 17 of TSB-19-54-005, as applicable. The supplied evidence does not include those later steps.
11. When to contact service
Contact a Mitsubishi dealer or qualified EV service facility if P1AFF is present or returns after the specified recheck. Further diagnosis is required by the official bulletins when the code returns.
12. What the service center may check
- Confirm P1AFF status in the EV-ECU after resetting CAN bus lines, as described by the cited bulletins.
- Clear the DTC and perform the specified quick-charge full-charge recheck.
- If P1AFF returns, follow the applicable later bulletin step. Detailed checks in those steps are not included in the supplied evidence.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied excerpts only establish the recheck procedure and escalation to a later diagnostic step if P1AFF returns.
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; NHTSA manufacturer communication MC-10158408: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf
- Mitsubishi TSB-19-54-004, published March 13, 2019; NHTSA manufacturer communication MC-10158409: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
- Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA manufacturer communication MC-10158410: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Verified applicability: U.S.-market Mitsubishi i-MiEV model years 2012, 2014, and 2016. The supplied official sources are NHTSA-hosted Mitsubishi manufacturer communications, not recall notices.
19. Frequently asked questions
What should happen if P1AFF does not return after the official recheck?
The cited bulletins state that the diagnosis is complete when the code is not stored/set after clearing it, fully charging through the quick-charging connector, and rechecking.
What if P1AFF returns after the recheck?
The official procedure directs the technician to Step 15 in TSB-19-54-003/004 or Step 17 in TSB-19-54-005. The supplied evidence does not provide the contents of those later steps.
Which vehicles are verified as applicable?
The supplied applicability data identifies U.S.-market Mitsubishi i-MiEV vehicles for model years 2012, 2014, and 2016.