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Mitsubishi P1AE3

Is the diagnostic trouble code set? YES : Perform the troubleshooting of DTC P1AE3. NO : Go to Step 2. STEP 2. Use scan tool MB991958 to confirm a diagnostic trouble code. Reconfir

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate because the verified Mitsubishi procedure requires BMU diagnosis using scan tool MB991958. Urgency and whether the vehicle may be driven or charged are not established by verified evidence.
Confidence95%

Quick answer

For a 2016 Mitsubishi i-MiEV in the US, P1AE3 is addressed in Mitsubishi TSB-19-54-005 as a BMU-related diagnostic code. The bulletin identifies a failed BMU temperature sensor as the probable cause and directs diagnosis with scan tool MB991958.

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 P1AE3 mean?

For a 2016 Mitsubishi i-MiEV in the US, P1AE3 is addressed in Mitsubishi TSB-19-54-005 as a BMU-related diagnostic code. The bulletin identifies a failed BMU temperature sensor as the probable cause and directs diagnosis with scan tool MB991958.

2. Technical explanation

Verified evidence states that P1AE3 should be confirmed in the BMU using scan tool MB991958. If P1AE3 is set, the bulletin directs technicians to perform the P1AE3 troubleshooting procedure. If it is not set, the bulletin instructs further confirmation: erase stored DTCs, switch the electric motor switch from LOCK (OFF) to ON after at least six hours, and check the BMU again for DTCs.

3. What system is affected?

BMU (Battery Management Unit), including the temperature sensor identified in the TSB probable-cause statement.

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

  • Mitsubishi TSB-19-54-005 identifies BMU temperature-sensor failure as the probable cause.

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 P1AE3 confirmed in the BMU with scan tool MB991958 by a qualified service provider.
  • Do not attempt high-voltage battery or BMU temperature-sensor repair without appropriate manufacturer procedures and qualified EV service training.

10. Step-by-step troubleshooting

  1. Confirm whether DTC P1AE3 is set in the BMU using scan tool MB991958.
  2. If P1AE3 is set, perform the P1AE3 troubleshooting procedure referenced by Mitsubishi TSB-19-54-005.
  3. If P1AE3 is not set, erase the DTCs that are set.
  4. After at least six hours, switch the electric motor switch from LOCK (OFF) to ON.
  5. Reconfirm whether DTCs are set in the BMU using scan tool MB991958.

11. When to contact service

Service is appropriate because the verified Mitsubishi procedure requires BMU diagnosis using scan tool MB991958. Urgency and whether the vehicle may be driven or charged are not established by verified evidence.

12. What the service center may check

  • Use scan tool MB991958 to check the BMU for P1AE3.
  • Follow the TSB’s erase, wait-at-least-six-hours, switch-ON, and recheck process when P1AE3 is not initially confirmed.
  • Perform the Mitsubishi P1AE3 troubleshooting procedure when the code is confirmed.

13. Possible repair or resolution

  • Not yet established by verified evidence. The supplied evidence identifies the BMU temperature sensor as the probable cause but does not provide a verified repair or replacement procedure.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-005, published March 13, 2019, is listed by NHTSA as Manufacturer Communication PDF 10158410. Its supplied evidence addresses P1AE3 in the BMU and identifies a failed BMU temperature sensor as the probable cause.

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 is covered by the verified evidence?

The supplied applicability data identifies the 2016 Mitsubishi i-MiEV in the US.

What does Mitsubishi identify as the probable cause of P1AE3?

Mitsubishi TSB-19-54-005 identifies failure of the BMU temperature sensor as the probable cause.

How is P1AE3 verified?

The TSB directs use of scan tool MB991958 to confirm whether P1AE3 is set in the BMU.

Can I drive or charge with P1AE3?

Not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi P1AE3: Is the diagnostic trouble code set? YES : Perform… | EV Diagnostics