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Mitsubishi P1A71

ion battery starts to be charged.  Eithe

DriveUnknown. Do not assume the vehicle is safe to drive based on the supplied evidence.
ChargeUnknown. Do not assume the vehicle is safe to charge based on the supplied evidence.
ServiceService is recommended because P1A71 concerns main drive lithium-ion battery temperature monitoring. The supplied evidence does not state whether service is mandatory.
Confidence95%

Quick answer

For a 2016 Mitsubishi i-MiEV in the US, DTC P1A71 is identified in the verified Mitsubishi/NHTSA bulletin as “CMU08 Battery Temperature.”

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 P1A71 mean?

For a 2016 Mitsubishi i-MiEV in the US, DTC P1A71 is identified in the verified Mitsubishi/NHTSA bulletin as “CMU08 Battery Temperature.”

2. Technical explanation

The verified source lists P1A71 among main drive lithium-ion battery Cell Monitoring Unit (CMU) battery-temperature DTCs. The supplied evidence states that the check conditions include 3 seconds after the electric motor switch is turned ON or 3 seconds after the main drive lithium-ion battery starts charging. The supplied excerpt is truncated and does not establish the complete fault criteria or diagnostic thresholds.

3. What system is affected?

Main drive lithium-ion battery; CMU08 battery-temperature monitoring.

4. How serious is this code?

Unknown. The verified evidence does not provide a severity classification.

5. Symptoms you may notice

  • A P1A71 diagnostic trouble code may be stored. Further symptoms are not yet established by verified evidence.

6. Possible causes

  • The verified bulletin references cooling-fan replacement and wiring-harness repair within its diagnostic material, but the supplied excerpt does not establish which condition specifically causes P1A71.
  • Not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. Do not assume the vehicle is safe to drive based on the supplied evidence.

8. Can I charge the vehicle?

Unknown. Do not assume the vehicle is safe to charge based on the supplied evidence.

9. What you can safely do

  • Have the vehicle evaluated by a qualified Mitsubishi EV service provider.
  • Do not perform high-voltage battery, CMU, cooling-fan, or wiring repairs yourself.
  • Record whether the code occurs after the vehicle is switched ON or after charging begins, as those are listed check-condition timing points in the verified source.

10. Step-by-step troubleshooting

  1. Use the applicable Mitsubishi diagnostic procedure for P1A71 / CMU08 Battery Temperature.
  2. The verified bulletin material references inspection leading to either cooling-fan replacement or wiring-harness repair, but the supplied evidence does not include the decision criteria or complete procedure.

11. When to contact service

Service is recommended because P1A71 concerns main drive lithium-ion battery temperature monitoring. The supplied evidence does not state whether service is mandatory.

12. What the service center may check

  • Confirm DTC P1A71 and review associated battery-related DTCs with approved diagnostic equipment.
  • Follow the applicable Mitsubishi procedure for CMU08 Battery Temperature.
  • The verified source references a possible main drive lithium-ion battery cooling-fan replacement and a possible wiring-harness repair; applicability to a particular vehicle is not established by the supplied excerpt.

13. Possible repair or resolution

  • Possible repair paths referenced by the verified bulletin are replacement of the cooling fan in the main drive lithium-ion battery or repair of the wiring harness. The supplied evidence does not establish which repair resolves P1A71 in any individual case.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA Manufacturer Communication MC-10158410-9999. The verified excerpt includes P1A71 as “CMU08 Battery Temperature.”

16. Recall information

  • No recall information was supplied or established by verified evidence.

17. Official manufacturer information

Verified official source: NHTSA-hosted Mitsubishi Manufacturer Communication MC-10158410-9999, TSB-19-54-005: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

19. Frequently asked questions

What does P1A71 mean on a 2016 Mitsubishi i-MiEV?

The verified Mitsubishi/NHTSA bulletin identifies P1A71 as CMU08 Battery Temperature.

When can P1A71 be checked?

The supplied source states the check conditions include 3 seconds after the electric motor switch is turned ON or 3 seconds after the main drive lithium-ion battery starts charging.

Does P1A71 prove the battery cooling fan is bad?

No. The bulletin references cooling-fan replacement and wiring-harness repair, but the supplied excerpt does not establish either as the definite cause of P1A71.

Is P1A71 applicable to every Mitsubishi EV?

No. The supplied applicability evidence is limited to the 2016 Mitsubishi i-MiEV in the US.

20. Sources & verification

Verified
Mitsubishi P1A71: ion battery starts to be charged.  Eithe | EV Diagnostics