EV Diagnostics
Verified EV diagnostic knowledge page

Mitsubishi P1A7C

ion batt

DriveUnknown. Not yet established by verified evidence.
ChargeUnknown. Not yet established by verified evidence.
ServiceService is advisable because this code is identified as a main drive lithium-ion battery cell-voltage-sensor DTC. The supplied evidence does not establish whether immediate towing is required.
Confidence95%

Quick answer

For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A7C is identified in Mitsubishi TSB-19-54-005 as “CMU07 Cell Voltage Sensor.” The bulletin concerns the main drive lithium-ion battery system. Driving, charging, and urgency are not yet established by verified evidence.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does P1A7C mean?

For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A7C is identified in Mitsubishi TSB-19-54-005 as “CMU07 Cell Voltage Sensor.” The bulletin concerns the main drive lithium-ion battery system. Driving, charging, and urgency are not yet established by verified evidence.

2. Technical explanation

Mitsubishi TSB-19-54-005 lists P1A7C as a fault for the CMU07 Cell Voltage Sensor. The bulletin’s excerpt states that its trouble-judgment checks include a condition occurring 3 seconds after the electric motor switch is turned ON, or 3 seconds after the main drive lithium-ion battery-related condition referenced in the bulletin. The supplied evidence does not establish the complete detection logic, electrical failure mode, or exact meaning of the database label “ion batt.”

3. What system is affected?

Main drive lithium-ion battery; specifically, the CMU07 cell-voltage-sensor designation in Mitsubishi TSB-19-54-005.

4. How serious is this code?

Unknown. The verified evidence does not assign a severity level.

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • The verified TSB excerpt references checking and tightening a bus bar in the main drive lithium-ion battery or replacing the main drive lithium-ion battery assembly. It does not establish which cause applies to P1A7C in an individual vehicle.
  • Not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. Not yet established by verified evidence.

8. Can I charge the vehicle?

Unknown. Not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis by a Mitsubishi dealer or qualified EV service provider.
  • Do not attempt high-voltage battery, bus-bar, or battery-assembly work yourself.

10. Step-by-step troubleshooting

  1. A service provider can confirm whether P1A7C is stored and assess it using the applicable Mitsubishi diagnostic procedure.
  2. The supplied bulletin excerpt directs a check related to tightening the bus bar in the main drive lithium-ion battery, with main drive lithium-ion battery assembly replacement referenced as an alternative. The full conditions and applicability of that instruction are not established by the supplied excerpt.

11. When to contact service

Service is advisable because this code is identified as a main drive lithium-ion battery cell-voltage-sensor DTC. The supplied evidence does not establish whether immediate towing is required.

12. What the service center may check

  • Confirm DTC P1A7C / CMU07 Cell Voltage Sensor.
  • Follow Mitsubishi TSB-19-54-005 and the applicable Mitsubishi service procedure.
  • Assess the bulletin-referenced main drive lithium-ion battery bus-bar condition only by personnel qualified for high-voltage battery work.

13. Possible repair or resolution

  • Mitsubishi TSB-19-54-005 references tightening the bus bar in the main drive lithium-ion battery or replacing the main drive lithium-ion battery assembly. The supplied evidence does not establish the exact repair required for every P1A7C occurrence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA manufacturer communication 10158410. It lists P1A7C as “CMU07 Cell Voltage Sensor.”

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 does P1A7C mean on a 2016 Mitsubishi i-MiEV?

Mitsubishi TSB-19-54-005 identifies P1A7C as “CMU07 Cell Voltage Sensor.”

Which vehicle is supported by the supplied evidence?

The verified applicability record covers the 2016 Mitsubishi i-MiEV in the US.

Can I drive or charge with P1A7C?

Not yet established by verified evidence.

Does P1A7C require battery replacement?

Not necessarily. The supplied TSB excerpt references tightening a main drive battery bus bar or replacing the main drive lithium-ion battery assembly, but it does not establish which repair is required for a specific vehicle.

20. Sources & verification

Verified
Mitsubishi P1A7C: ion batt | EV Diagnostics