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Mitsubishi P1AFB

Replace the EV-ECU. Then go to Step 8. NO : The diagnosis is complete. STEP 8. Check whether the DTC is stored again Check again if the DTC is stored in the EV-ECU. (1) Erase the s

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence. The documented confirmation procedure uses a quick-charging connection after DTC erasure, but this is a service diagnostic procedure and does not establish that normal charging is safe or unsafe.
ServiceService is appropriate because the verified procedure can require EV-ECU replacement and refers to a manufacturer diagnostic sequence whose earlier steps are not included in the supplied evidence.
Confidence95%

Quick answer

For verified U.S. Mitsubishi i-MiEV applicability (2012, 2014, and 2016), the supplied manufacturer diagnostic evidence directs EV-ECU replacement if DTC P1AFB remains stored/set at the specified diagnostic step, followed by a DTC-clear and quick-charge recheck.

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 P1AFB mean?

For verified U.S. Mitsubishi i-MiEV applicability (2012, 2014, and 2016), the supplied manufacturer diagnostic evidence directs EV-ECU replacement if DTC P1AFB remains stored/set at the specified diagnostic step, followed by a DTC-clear and quick-charge recheck.

2. Technical explanation

The supplied evidence does not provide a plain-language fault definition for P1AFB. It documents a diagnostic decision: if P1AFB is stored/set at the referenced step, replace the EV-ECU and proceed to a confirmation check. For confirmation, the procedure calls for erasing the DTC, connecting the quick-charging connector/gun to charge the battery completely, and checking whether P1AFB returns. If it returns, the procedure directs returning to Step 1; if it does not return, diagnosis is complete.

3. What system is affected?

EV-ECU. The supplied evidence also references quick charging and the local CAN communication path, but does not establish a specific failed component or subsystem for P1AFB.

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

  • The verified evidence does not establish a root cause for P1AFB.
  • The manufacturer procedure identifies EV-ECU replacement when P1AFB remains present at its specified decision point.
  • The supplied bulletin material states that CAN bus problems can cause an incorrect DTC to be stored/set, but the provided excerpt places that caution with the following P1AFC diagnostic section; its specific applicability to P1AFB is not established by the supplied 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. The documented confirmation procedure uses a quick-charging connection after DTC erasure, but this is a service diagnostic procedure and does not establish that normal charging is safe or unsafe.

9. What you can safely do

  • Have a qualified Mitsubishi EV service provider diagnose the stored P1AFB code using the manufacturer procedure.
  • Record whether the code is stored/set and whether it returns after the documented confirmation process.
  • Do not attempt EV-ECU replacement or high-voltage-system repair without qualified EV service support.

10. Step-by-step troubleshooting

  1. The supplied evidence references an earlier Step 1, but its content is not provided; it cannot be reconstructed from the available material.
  2. At the referenced decision point, check whether P1AFB is stored/set in the EV-ECU.
  3. If P1AFB is stored/set at that point, the manufacturer procedure directs replacement of the EV-ECU.
  4. After replacement, erase the DTC.
  5. Connect the quick-charging connector/gun and charge the battery completely, as stated in the supplied procedure.
  6. Check whether P1AFB is stored/set again.
  7. If P1AFB returns, return to Step 1 of the manufacturer diagnostic procedure. If it does not return, the procedure states that diagnosis is complete.

11. When to contact service

Service is appropriate because the verified procedure can require EV-ECU replacement and refers to a manufacturer diagnostic sequence whose earlier steps are not included in the supplied evidence.

12. What the service center may check

  • Confirm P1AFB status in the EV-ECU at the relevant manufacturer diagnostic step.
  • Follow the applicable Mitsubishi diagnostic procedure, including any preceding Step 1 checks not included in the supplied excerpt.
  • If P1AFB remains present at the specified decision point, replace the EV-ECU as directed by the manufacturer procedure.
  • Erase the DTC after replacement.
  • Perform the documented quick-charge confirmation check and determine whether P1AFB returns.

13. Possible repair or resolution

  • Verified manufacturer-directed resolution at the referenced decision point: replace the EV-ECU if P1AFB is stored/set.
  • After EV-ECU replacement, erase the DTC and perform the specified quick-charge recheck.
  • If P1AFB does not return after the recheck, the supplied procedure states that diagnosis is complete.
  • If P1AFB returns, the supplied procedure directs returning to Step 1.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-003, published March 13, 2019; available through NHTSA as Manufacturer Communication MC-10158408: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf
  • Mitsubishi TSB-19-54-004, published March 13, 2019; available through NHTSA as Manufacturer Communication MC-10158409: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
  • Mitsubishi TSB-19-54-005, published March 13, 2019; available through NHTSA as 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 NHTSA-hosted manufacturer communications document the diagnostic instructions summarized on this page. No recall information is established by the supplied evidence.

19. Frequently asked questions

What does P1AFB mean?

Not yet established by verified evidence. The supplied material provides a diagnostic action for P1AFB rather than a plain-language fault definition.

Does P1AFB require EV-ECU replacement?

The manufacturer procedure directs EV-ECU replacement if P1AFB is stored/set at the referenced diagnostic decision point. It does not establish that every initial occurrence of P1AFB automatically requires replacement without completing the preceding diagnostic steps.

What happens after EV-ECU replacement?

The supplied procedure calls for erasing the DTC, connecting the quick-charging connector/gun to charge the battery completely, and checking whether P1AFB returns. If it returns, return to Step 1; if it does not, diagnosis is complete.

Which vehicles are verified as applicable?

U.S. Mitsubishi i-MiEV model years 2012, 2014, and 2016 are verified by the supplied applicability evidence.

Can I drive or charge with P1AFB?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi P1AFB: Replace the EV-ECU. Then go to Step 8. NO : The… | EV Diagnostics