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Mitsubishi P1D33

AD Converter Abnormal . TROUBLE JUDGMENT Check Condition  While the on board charger is allowed to be charged from the EV-ECU. Judgment Criterion  When it is detected that the AD

DriveNot yet established by verified evidence.
ChargeThe verified fail-safe function states that charging is stopped. Whether charging can resume under other conditions is not yet established by verified evidence.
ServiceService is appropriate if P1D33 returns after the specified clear-code and regular-charge check. The TSB directs replacement of the on-board charger/DC-DC converter when the DTC is set again.
Confidence95%

Quick answer

For a 2012–2013 Mitsubishi i-MiEV (US), DTC P1D33 indicates an abnormality detected in the on-board charger’s AD conversion module. The verified fail-safe action is that charging stops.

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 P1D33 mean?

For a 2012–2013 Mitsubishi i-MiEV (US), DTC P1D33 indicates an abnormality detected in the on-board charger’s AD conversion module. The verified fail-safe action is that charging stops.

2. Technical explanation

Verified TSB evidence states that P1D33 is judged while the EV-ECU allows the on-board charger to charge. It is set when the AD conversion module is detected as abnormal, including a conversion-time timeout in that module.

3. What system is affected?

On-board charger / DC-DC converter assembly; specifically, the AD conversion module described in the TSB.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Charging is stopped when P1D33 is present, according to the verified fail-safe description.

6. Possible causes

  • An abnormal AD conversion module, including an AD conversion timeout, is the stated fault condition.
  • If the DTC does not return after clearing and performing a regular charge, the TSB identifies the condition as an intermittent malfunction.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

The verified fail-safe function states that charging is stopped. Whether charging can resume under other conditions is not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis by a qualified Mitsubishi EV service provider.
  • Avoid attempting high-voltage component diagnosis or replacement yourself.

10. Step-by-step troubleshooting

  1. The cited TSB directs technicians to erase the DTC.
  2. The TSB then directs performing a regular charge.
  3. The TSB directs checking whether P1D33 is set again after the regular charge.
  4. If P1D33 is set again, the TSB directs replacement of the on-board charger/DC-DC converter.
  5. If P1D33 does not return, the TSB identifies an intermittent malfunction and refers to Mitsubishi intermittent-malfunction procedures.

11. When to contact service

Service is appropriate if P1D33 returns after the specified clear-code and regular-charge check. The TSB directs replacement of the on-board charger/DC-DC converter when the DTC is set again.

12. What the service center may check

  • Confirm the DTC after a regular charge following DTC erasure.
  • Determine whether P1D33 recurs.
  • If it recurs, replace the on-board charger/DC-DC converter as directed by the TSB.

13. Possible repair or resolution

  • If P1D33 is set again after the TSB procedure, replace the on-board charger/DC-DC converter.
  • If P1D33 does not recur, address it as an intermittent malfunction using the referenced Mitsubishi procedures.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-20-54-003, published April 22, 2020, is cited by NHTSA as manufacturer communication MC-10175779. It contains the stated P1D33 test sequence and repair direction.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified source: NHTSA-hosted Mitsubishi manufacturer communication PDF MC-10175779, TSB-20-54-003: https://static.nhtsa.gov/odi/tsbs/2020/MC-10175779-9999.pdf

19. Frequently asked questions

What does Mitsubishi i-MiEV code P1D33 mean?

For the verified application, it means the on-board charger detected an abnormal AD conversion module condition, including an AD conversion timeout.

What happens when P1D33 is detected?

The verified fail-safe function is that charging stops.

What does the Mitsubishi TSB direct if P1D33 returns?

After erasing the DTC and performing a regular charge, if P1D33 is set again, the TSB directs replacement of the on-board charger/DC-DC converter.

What if P1D33 does not return after clearing it and charging?

The TSB identifies this as an intermittent malfunction and refers technicians to Mitsubishi intermittent-malfunction procedures.

20. Sources & verification

Verified
Mitsubishi P1D33: AD Converter Abnormal . TROUBLE JUDGMENT Check… | EV Diagnostics