Mitsubishi P0A09
DC converter, and that the high voltage fuse in the Motor Control Unit (MCU) is blown. For diagnosis of DTC P0A09, refer to the applicable Service Manual, Group 54D, Electric Motor
Quick answer
For a 2012 Mitsubishi i-MiEV (US), DTC P0A09 is identified in Mitsubishi service communications as a DC-DC converter-related fault. Verified Mitsubishi/NHTSA evidence describes a condition in which On-Board Charger (OBC) capacitors may short, blowing the high-voltage fuse in the Motor Control Unit (MCU).
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 P0A09 mean?
For a 2012 Mitsubishi i-MiEV (US), DTC P0A09 is identified in Mitsubishi service communications as a DC-DC converter-related fault. Verified Mitsubishi/NHTSA evidence describes a condition in which On-Board Charger (OBC) capacitors may short, blowing the high-voltage fuse in the Motor Control Unit (MCU).
2. Technical explanation
Mitsubishi TSB information states that capacitors on circuit boards in the On-Board Charger (OBC) may short and cause the MCU high-voltage fuse to blow. In the documented condition, regular charging of the drive battery may not occur and the 12-volt battery may not be charged. Mitsubishi directs diagnosis through the applicable Service Manual, Group 54D, under the DTC P0A09 DC-DC Converter procedure. TSB-19-54-014 updated that diagnostic procedure.
3. What system is affected?
Verified evidence identifies the On-Board Charger (OBC), DC-DC converter diagnosis, the Motor Control Unit (MCU) high-voltage fuse, drive-battery regular charging, and 12-volt battery charging.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Power unit warning light turns on.
- 12-volt battery warning light turns on.
- DTC P0A09 is set.
- The drive battery may not charge through regular charging.
- The 12-volt battery may not charge.
6. Possible causes
- For the documented 2012 Mitsubishi i-MiEV condition, capacitors on OBC circuit boards may short and cause the MCU high-voltage fuse to blow.
- Other 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?
Regular charging of the drive battery may not be possible in the documented condition.
9. What you can safely do
- Arrange diagnosis using the applicable Mitsubishi service procedure for DTC P0A09.
- Do not attempt high-voltage fuse, OBC, or other high-voltage component repair yourself.
- Contact a Mitsubishi dealer or qualified EV service provider.
10. Step-by-step troubleshooting
- Confirm whether DTC P0A09 is stored.
- Mitsubishi directs technicians to the applicable Service Manual, Group 54D, Electric Motor Unit and Traction Battery / EV-ECU / Diagnostic Trouble Code Procedures / DTC P0A09 DCDC Converter.
- Refer to TSB-19-54-014 for the revised DTC P0A09 diagnostic procedure.
- For the condition addressed by TSB-19-54-016, confirm P0A09 and that the MCU high-voltage fuse is blown.
11. When to contact service
Service contact is appropriate. Mitsubishi issued dealer communications addressing P0A09 diagnosis and an OBC warranty extension for affected 2012 i-MiEV vehicles.
12. What the service center may check
- Check for DTC P0A09 using the applicable service procedure.
- Diagnose P0A09 according to the applicable Service Manual, Group 54D.
- Use the updated diagnostic information in TSB-19-54-014.
- For the TSB-19-54-016 condition, confirm the MCU high-voltage fuse status.
- Assess whether the vehicle qualifies for the documented OBC warranty extension.
13. Possible repair or resolution
- TSB-19-54-016 instructs replacement of the On-Board Charger (OBC) with a new unit after confirmation of the specified condition, following the applicable Service Manual removal and installation procedure.
- The bulletin references updated OBC labeling with a countermeasure mark.
- Any repair beyond this documented bulletin path is not yet established by verified evidence.
14. Affected vehicles
- Mitsubishi i-MiEV · 2012 · US
15. Related TSBs / service bulletins
- TSB-19-54-014: Updates the Chassis Electrical section of the affected service manual to revise the diagnostic procedure for DTC P0A09 (DC-DC Converter). Published July 16, 2019.
- TIN-19-54-001: States that OBC circuit-board capacitors may short, blow the MCU high-voltage fuse, prevent regular drive-battery charging and 12-volt battery charging, illuminate warnings, and set P0A09. Published September 5, 2019.
- TSB-19-54-016: Directs confirmation of P0A09 and a blown MCU high-voltage fuse, then replacement of the OBC following the applicable service manual. Published September 5, 2019.
16. Recall information
- No recall is established by the supplied verified evidence.
17. Official manufacturer information
Applicability established by the supplied evidence: 2012 Mitsubishi i-MiEV, US. Mitsubishi stated that it extended OBC warranty coverage for affected 2012 i-MiEV vehicles to 10 years/unlimited miles; owners of affected vehicles were to receive letters. Eligibility for a specific vehicle is not established by the supplied evidence.
19. Frequently asked questions
What does P0A09 mean on a 2012 Mitsubishi i-MiEV?
The supplied Mitsubishi evidence identifies P0A09 as a DC-DC converter-related DTC and documents an OBC-related condition that can blow the MCU high-voltage fuse.
Can P0A09 prevent charging?
Yes. Mitsubishi states that, in the documented OBC capacitor-short condition, the drive battery may not be charged by regular charging and the 12-volt battery may not be charged.
What warning lights can occur with P0A09?
Mitsubishi states that the power unit and 12-volt battery warning lights turn on in the documented condition.
Was there a Mitsubishi warranty extension?
Mitsubishi stated that OBC warranty coverage for affected 2012 i-MiEV vehicles was extended to 10 years/unlimited miles. Individual vehicle eligibility is not established by the supplied evidence.
What repair does Mitsubishi specify in TSB-19-54-016?
After confirmation of P0A09 and a blown MCU high-voltage fuse, the bulletin directs replacement of the On-Board Charger using the applicable service-manual procedure.