EV Diagnostics
Verified EV diagnostic knowledge page

Mitsubishi P1A89

ion ba

DriveUnknown. The supplied verified evidence does not establish whether the vehicle is safe to drive with P1A89.
ChargeUnknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with P1A89.
ServiceService is recommended because P1A89 concerns a temperature-sensor diagnostic in the main drive lithium-ion battery system. The urgency and drivability status are not established by the supplied verified evidence.
Confidence95%

Quick answer

For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A89 is identified in Mitsubishi TSB-19-54-005 as “CMU08 Battery Temperature Sensor.”

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 P1A89 mean?

For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A89 is identified in Mitsubishi TSB-19-54-005 as “CMU08 Battery Temperature Sensor.”

2. Technical explanation

The verified Mitsubishi service-bulletin evidence associates P1A89 with the CMU08 battery temperature sensor within the main drive lithium-ion battery system. The supplied excerpt states that the diagnostic check condition includes three seconds after the electric motor switch is turned ON, or three seconds after the main drive lithium-ion battery-related condition described in the bulletin excerpt. Further diagnostic criteria and repair instructions are not established by the supplied verified evidence.

3. What system is affected?

Main drive lithium-ion battery; specifically the CMU08 battery temperature sensor, according to Mitsubishi TSB-19-54-005.

4. How serious is this code?

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

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • A CMU08 battery temperature sensor diagnostic fault is indicated by P1A89.
  • Specific underlying causes are not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The supplied verified evidence does not establish whether the vehicle is safe to drive with P1A89.

8. Can I charge the vehicle?

Unknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with P1A89.

9. What you can safely do

  • Arrange professional diagnosis by a Mitsubishi-qualified EV service facility.
  • Do not attempt high-voltage battery, battery-sensor, or battery-management-system repair yourself.

10. Step-by-step troubleshooting

  1. Confirm the stored code using suitable diagnostic equipment.
  2. Use Mitsubishi service information, including TSB-19-54-005, for professional diagnosis of the CMU08 battery temperature sensor circuit and associated battery system.
  3. Additional test steps are not yet established by the supplied verified evidence.

11. When to contact service

Service is recommended because P1A89 concerns a temperature-sensor diagnostic in the main drive lithium-ion battery system. The urgency and drivability status are not established by the supplied verified evidence.

12. What the service center may check

  • Retrieve and confirm DTC P1A89.
  • Diagnose the CMU08 battery temperature sensor using applicable Mitsubishi service information.
  • Further service checks are not yet established by verified evidence.

13. Possible repair or resolution

  • The required repair is not yet established by verified evidence. Repair should follow Mitsubishi diagnostic procedures after the fault is confirmed.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-005, published March 13, 2019, lists P1A89 as “CMU08 Battery Temperature Sensor” for the electric motor unit and main drive lithium-ion battery diagnostic information.

16. Recall information

  • No recall information was supplied in the verified evidence.

17. Official manufacturer information

Verified source: NHTSA-hosted Mitsubishi Manufacturer Communication PDF 10158410, Mitsubishi TSB-19-54-005, published March 13, 2019: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

19. Frequently asked questions

What does P1A89 mean on a 2016 Mitsubishi i-MiEV?

For the US-market 2016 Mitsubishi i-MiEV, verified Mitsubishi bulletin evidence identifies P1A89 as “CMU08 Battery Temperature Sensor.”

What vehicle is this information verified for?

The supplied applicability evidence covers the 2016 Mitsubishi i-MiEV in the United States.

Is it safe to drive or charge with P1A89?

Not yet established by verified evidence.

Does P1A89 identify a recall?

No recall information was supplied in the verified evidence.

20. Sources & verification

Verified
Mitsubishi P1A89: ion ba | EV Diagnostics