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Mitsubishi P1A16

ECU. Q: Is the DTC stored? YES : Carry out troubleshooting for the DTC. NO : Go to Step 11. ACC07057 AE Harness side Charging contactor connector C-22 (GR) Intermediate connector (

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceProfessional diagnosis is appropriate because the cited procedures involve the EV-ECU, main drive lithium-ion battery charging contactor, and manufacturer scan-tool steps.
Confidence95%

Quick answer

P1A16 is documented in Mitsubishi i-MiEV EV-ECU diagnostic procedures. The supplied evidence does not establish a plain-language fault definition 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 P1A16 mean?

P1A16 is documented in Mitsubishi i-MiEV EV-ECU diagnostic procedures. The supplied evidence does not establish a plain-language fault definition for this code.

2. Technical explanation

Official Mitsubishi communications describe P1A16 as a code considered during EV-ECU diagnostic checks. In the cited procedures, technicians use scan tool MB991958 to check for other DTCs in the EV-ECU, excluding P1A16 in certain diagnostic paths. The procedures direct troubleshooting of any additional stored DTCs before proceeding. The supplied excerpts also reference charging-contactor replacement in preceding decision steps, but they do not establish that P1A16 itself identifies a failed charging contactor.

3. What system is affected?

EV-ECU. The evidence also references the main drive lithium-ion battery charging contactor within related diagnostic procedures.

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 evaluated using the applicable Mitsubishi diagnostic procedure and scan tool equipment.
  • Do not attempt high-voltage battery or charging-contactor repairs yourself.

10. Step-by-step troubleshooting

  1. Use scan tool MB991958 to check the EV-ECU for additional DTCs, as directed by the cited Mitsubishi procedures.
  2. Where other applicable DTCs are stored, carry out troubleshooting for those DTCs before continuing.
  3. The supplied procedure excerpts reference subsequent checks of other systems, including the A/C control unit in one bulletin excerpt.

11. When to contact service

Professional diagnosis is appropriate because the cited procedures involve the EV-ECU, main drive lithium-ion battery charging contactor, and manufacturer scan-tool steps.

12. What the service center may check

  • Scan the EV-ECU with Mitsubishi scan tool MB991958 for additional DTCs.
  • Follow the applicable Mitsubishi decision tree for the vehicle and stored-code combination.
  • Check other systems only as directed by the applicable procedure.

13. Possible repair or resolution

  • Not yet established by verified evidence for P1A16 alone.
  • The cited procedures specify charging-contactor replacement only within particular preceding decision branches; the supplied evidence does not establish it as the repair for P1A16 by itself.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-003, published March 13, 2019; NHTSA communication MC-10158408.
  • Mitsubishi TSB-19-54-004, published March 13, 2019; NHTSA communication MC-10158409.
  • Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA communication MC-10158410.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Applicable verified evidence covers U.S.-market Mitsubishi i-MiEV model years 2012, 2014, and 2016. Official NHTSA-hosted manufacturer communications: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158408-9999.pdf ; https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf ; https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

19. Frequently asked questions

What does P1A16 mean on a Mitsubishi i-MiEV?

The supplied verified evidence places P1A16 in Mitsubishi EV-ECU diagnostic procedures, but does not provide a reliable plain-language fault definition.

Which vehicles are covered by the supplied evidence?

U.S.-market Mitsubishi i-MiEV vehicles for model years 2012, 2014, and 2016.

Does P1A16 prove that the charging contactor must be replaced?

No. The supplied excerpts mention charging-contactor replacement in certain decision branches, but do not establish that P1A16 alone requires that repair.

Is it safe to drive or charge with P1A16?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi P1A16: ECU. Q: Is the DTC stored? YES : Carry out… | EV Diagnostics