Mitsubishi P1A73
ion battery starts to be charged. Either one of the following diagnostic trouble codes is not set . a. P1
Quick answer
For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A73 is identified in Mitsubishi TSB-19-54-005 as “CMU10 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 P1A73 mean?
For a 2016 Mitsubishi i-MiEV sold in the US, DTC P1A73 is identified in Mitsubishi TSB-19-54-005 as “CMU10 Battery Temperature.”
2. Technical explanation
The verified TSB evidence places P1A73 in a group of main drive lithium-ion battery Cell Monitoring Unit (CMU) temperature codes: P1A6A through P1A75. Within that group, P1A73 corresponds to CMU10 Battery Temperature. The cited trouble-judgment conditions include that 3 seconds have elapsed after the electric motor switch is turned ON, or 3 seconds have elapsed after main drive lithium-ion battery charging starts. The supplied evidence does not provide the complete diagnostic criteria or a confirmed component-level failure cause for P1A73.
3. What system is affected?
Main drive lithium-ion battery monitoring; specifically, CMU10 battery-temperature monitoring.
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
- Not yet established by verified evidence. The supplied TSB excerpt references wiring-harness repair in its diagnostic material, but the excerpt does not establish that a wiring-harness fault is the cause of P1A73 in every case.
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 service facility.
- Do not attempt high-voltage battery, CMU, temperature-sensor, or wiring repairs yourself.
10. Step-by-step troubleshooting
- Use Mitsubishi’s applicable diagnostic procedure for P1A73/CMU10 Battery Temperature in TSB-19-54-005 or the relevant service information.
- The supplied evidence indicates the diagnostic material may lead to wiring-harness repair, but it does not include enough procedure detail to specify tests or repair steps.
11. When to contact service
Service evaluation is appropriate because this code concerns main drive lithium-ion battery temperature monitoring. The supplied evidence does not establish urgency, driving restrictions, or charging restrictions.
12. What the service center may check
- Confirm DTC P1A73 using suitable diagnostic equipment.
- Follow the applicable Mitsubishi diagnostic procedure for CMU10 Battery Temperature.
- Inspect and repair the wiring harness only if directed by the manufacturer diagnostic procedure.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied TSB excerpt states “Repair the wiring harness” in diagnostic material, but does not establish the exact fault condition, affected harness section, or final repair for an individual vehicle.
14. Affected vehicles
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA Manufacturer Communication PDF 10158410. The supplied excerpt identifies P1A73 as CMU10 Battery Temperature and includes diagnostic conditions related to electric-motor-switch ON time or charging-start time.
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Verified 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 P1A73 mean on a 2016 Mitsubishi i-MiEV?
Verified evidence identifies P1A73 as “CMU10 Battery Temperature.”
Which vehicle is covered by the supplied applicability data?
The verified applicability data identifies the 2016 Mitsubishi i-MiEV in the US.
Can I drive or charge with P1A73?
Not yet established by verified evidence.
Does P1A73 prove the battery pack must be replaced?
No. The supplied evidence does not establish battery-pack replacement as the required repair.