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Mitsubishi P1A72

ion battery starts to be charged.  Either one of the following diagnostic

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is recommended because this code concerns monitoring within the main drive lithium-ion battery system. The supplied evidence does not establish urgency, drivability, or charging status.
Confidence95%

Quick answer

For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A72 is identified in Mitsubishi TSB-19-54-005 as “CMU09 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 P1A72 mean?

For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A72 is identified in Mitsubishi TSB-19-54-005 as “CMU09 Battery Temperature.”

2. Technical explanation

Verified evidence states that P1A72 concerns the battery-temperature signal monitored by CMU09 (Cell Monitoring Unit 09). The TSB excerpt states the diagnostic check can occur 3 seconds after the electric motor switch is turned ON or 3 seconds after the main drive lithium-ion battery starts charging. The supplied evidence does not establish the complete diagnostic criteria, failure threshold, or exact fault mechanism.

3. What system is affected?

Main drive lithium-ion battery temperature monitoring, specifically CMU09.

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 supplied TSB excerpt references repairing the wiring harness in its diagnostic material, but the excerpt does not establish that wiring is the cause of P1A72 in every case.
  • Any additional causes are 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

  • Arrange diagnosis by a Mitsubishi-qualified EV service facility.
  • Do not attempt high-voltage battery, CMU, or wiring repairs yourself.

10. Step-by-step troubleshooting

  1. Have a qualified technician retrieve and document all stored DTCs.
  2. Use the Mitsubishi diagnostic procedure applicable to P1A72 / CMU09 Battery Temperature.
  3. Inspect and test according to manufacturer procedures; the supplied TSB excerpt references wiring-harness repair within its diagnostic material.

11. When to contact service

Service is recommended because this code concerns monitoring within the main drive lithium-ion battery system. The supplied evidence does not establish urgency, drivability, or charging status.

12. What the service center may check

  • Confirm P1A72 is current or stored and check for accompanying DTCs.
  • Follow Mitsubishi’s diagnostic procedure for CMU09 Battery Temperature.
  • Evaluate the relevant wiring harness according to the manufacturer procedure.

13. Possible repair or resolution

  • Repair the wiring harness if the manufacturer diagnostic procedure identifies a harness fault.
  • Any other repair resolution is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-005, published March 13, 2019, includes P1A72 as “CMU09 Battery Temperature” and applies in the supplied database to the 2016 Mitsubishi i-MiEV, US market.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Official source: NHTSA-hosted Mitsubishi manufacturer communication, TSB-19-54-005 (MC-10158410-9999): https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

19. Frequently asked questions

What does P1A72 mean on a 2016 Mitsubishi i-MiEV?

The verified Mitsubishi TSB identifies P1A72 as “CMU09 Battery Temperature.”

When can P1A72 be checked?

The supplied TSB excerpt states the check occurs 3 seconds after the electric motor switch is turned ON, or 3 seconds after the main drive lithium-ion battery starts charging.

Can I drive or charge with P1A72?

Not yet established by verified evidence.

Is there an official bulletin for P1A72?

Yes. Mitsubishi TSB-19-54-005 includes P1A72 for the 2016 US-market i-MiEV in the supplied evidence.

20. Sources & verification

Verified
Mitsubishi P1A72: ion battery starts to be charged.  Either one of… | EV Diagnostics