If your 12V Aux battery is not too old or too weak, then this code has no remedy in the service manual. Hopefully they might cover it, but if not maybe you could find a used one rather than pay full new. We could take a look to fix the PFC circuit on the board, nothing to lose.
Code No. 39: Power Factor Correction (PFC) Circuit Output Voltage Abnormal (either too high or too low)
TROUBLE JUDGMENT
Check Conditions
The on board charger control power supply voltage is more than 8 V.
While the on board charger is powered from the EV-ECU.
Judgement Criterion
Power factor improvement circuit (PFC) output voltage is more than 400 V.
or
The power factor improvement circuit (PFC) output voltage is smaller than the specified value.
FAIL-SAFE AND BACKUP FUNCTION
The charge is stopped.
PROBABLE CAUSE
The on board charger is failed.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q. Is the diagnosis code set?
Yes, Replace the on board charger/DC-DC converter.
No, Then it is an Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions
