Mitsubishi P1A48
ion batt ery is charged. Judgment Criterion The PWM output signal of the main drive lithium-ion battery coolin g fan is 100 % (while the fan is stopped) and the PWM output signal
Quick answer
P1A48 is a Mitsubishi i-MiEV battery-management diagnostic trouble code identified in the supplied official service bulletin as “BATT. Cooling Fan Output Circuit.”
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 P1A48 mean?
P1A48 is a Mitsubishi i-MiEV battery-management diagnostic trouble code identified in the supplied official service bulletin as “BATT. Cooling Fan Output Circuit.”
2. Technical explanation
Verified evidence states that P1A48 is checked when the electric motor switch is ON or while the main drive lithium-ion battery is charging. The documented judgment criterion refers to the PWM output signal for the main drive lithium-ion battery cooling fan, including a 100% PWM output condition while the fan is stopped. The supplied excerpt is truncated after this point, so further diagnostic criteria are not established by verified evidence.
3. What system is affected?
Main drive lithium-ion battery cooling fan output circuit; battery management unit (BMU).
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
- A fault condition associated with the main drive lithium-ion battery cooling-fan output circuit is established by the official TSB title for P1A48.
- The supplied procedure directs replacement of the BMU only after the specified scan-tool confirmation step. The evidence provided does not establish all underlying causes or whether BMU replacement applies in every P1A48 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 qualified Mitsubishi EV service provider.
- Provide the stored DTC P1A48 and the vehicle details when booking service.
- Do not attempt high-voltage battery or BMU repair procedures yourself.
10. Step-by-step troubleshooting
- The official procedure references using scan tool MB991958 to confirm whether a diagnostic trouble code is set.
- In the supplied TSB excerpt, the indicated action after a confirmed DTC at that procedure step is replacement of the BMU, with reference to service manual page 54D-188.
- Additional test steps, wiring checks, and fan-circuit inspection procedures are not established by the supplied verified evidence.
11. When to contact service
Service is appropriate because the official procedure includes scan-tool diagnosis and, under the documented procedure condition, BMU replacement.
12. What the service center may check
- Confirm P1A48 with scan tool MB991958, as referenced in TSB-19-54-005.
- Follow the applicable Mitsubishi service procedure for the main drive lithium-ion battery cooling-fan output circuit.
- Determine whether the procedure’s specified BMU replacement condition is met.
13. Possible repair or resolution
- The supplied official TSB excerpt specifies BMU replacement after the referenced scan-tool confirmation step. It does not provide enough evidence to state a universal repair outcome for every P1A48 occurrence.
14. Affected vehicles
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-005, published through NHTSA as Manufacturer Communication PDF 10158410 on 2019-03-13. The excerpt identifies DTC P1A48 as “BATT. Cooling Fan Output Circuit” and references BMU replacement within its diagnostic procedure.
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Verified source: NHTSA-hosted Mitsubishi Manufacturer Communication PDF 10158410, TSB-19-54-005: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf
19. Frequently asked questions
What does P1A48 mean on a Mitsubishi i-MiEV?
The supplied official TSB identifies P1A48 as “BATT. Cooling Fan Output Circuit.”
When can P1A48 be evaluated?
The official excerpt states the check conditions are with the electric motor switch ON or while the main drive lithium-ion battery is charging.
Which vehicle is covered by the supplied evidence?
The verified applicability record identifies the 2016 Mitsubishi i-MiEV in the US.
Can I drive or charge with P1A48?
Not yet established by verified evidence.
What repair does the supplied procedure mention?
It directs replacement of the BMU after the referenced scan-tool confirmation step. Whether that applies to a particular vehicle must be determined using the complete applicable service procedure.