Mitsubishi P1D40
: Inverter Output Current TSB-20-54-003 Page 43 of 95 FAIL-SAFE AND BACKUP FUNCTION The charge is stopped. . PROBABLE CAUSES The EV-ECU is failed. There is not enough coolant
Quick answer
For U.S.-market 2012–2013 Mitsubishi i-MiEV vehicles, verified TSB evidence associates DTC P1D40 with the inverter-output-current diagnostic material and states that charging is stopped under the applicable fail-safe function. The supplied excerpt does not establish whether the vehicle is safe to drive or charge after the code is present.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
Watch Videos
Relevant videos play here without leaving this diagnostic page.
No sufficiently relevant embeddable video has been accepted for this diagnostic yet.
Videos are supporting material and never override OEM or regulator evidence.
1. What does P1D40 mean?
For U.S.-market 2012–2013 Mitsubishi i-MiEV vehicles, verified TSB evidence associates DTC P1D40 with the inverter-output-current diagnostic material and states that charging is stopped under the applicable fail-safe function. The supplied excerpt does not establish whether the vehicle is safe to drive or charge after the code is present.
2. Technical explanation
The verified source is Mitsubishi TSB-20-54-003, published through NHTSA. Its supplied evidence excerpt includes P1D40 in a group of charger temperature-related diagnostic criteria; specifically, it states that the input-diode-area temperature sensor is more than 110°C (230°F). The same supplied excerpt also states, under the fail-safe and backup function for the surrounding diagnostic material, that charging is stopped. The diagnostic title supplied in the database labels P1D40 as “Inverter Output Current,” but the evidence excerpt also contains temperature-sensor criteria; the exact relationship between those excerpts is not further established by the supplied verified evidence.
3. What system is affected?
Not yet established by verified evidence. The supplied TSB excerpt references the on-board charger, EV-ECU, coolant, water pump, radiator fan, and temperature-sensor criteria.
4. How serious is this code?
Unknown. The supplied verified evidence confirms a charging-stop fail-safe statement but does not provide a severity classification.
5. Symptoms you may notice
- Charging is stopped, according to the supplied TSB fail-safe statement.
- The supplied evidence does not establish any additional driver-observable symptoms.
6. Possible causes
- EV-ECU failure.
- Insufficient coolant.
- Water-pump failure.
- Radiator-fan failure.
- The supplied evidence excerpt is truncated after “The temperature”; no further cause should be inferred.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
The supplied TSB evidence states that charging is stopped under the referenced fail-safe function. Whether charging can resume after the condition is corrected or cleared is not yet established by verified evidence.
9. What you can safely do
- Do not attempt high-voltage diagnosis or repair.
- Arrange professional diagnosis if P1D40 is stored or charging has stopped.
- Not yet established by verified evidence whether driving the vehicle is appropriate.
10. Step-by-step troubleshooting
- A qualified service technician should retrieve and evaluate the DTC in the context of Mitsubishi TSB-20-54-003.
- The supplied evidence identifies the EV-ECU, coolant quantity, water pump, radiator fan, and temperature-related conditions as diagnostic considerations.
- Specific test procedures, thresholds beyond the quoted 110°C (230°F) sensor criterion, and repair steps are not established by the supplied evidence.
11. When to contact service
Professional service is appropriate because the verified TSB identifies potential EV-ECU, cooling-system, pump, fan, and temperature-related issues, while charging is stopped by the referenced fail-safe function.
12. What the service center may check
- Check for DTC P1D40 and applicable related diagnostic information in TSB-20-54-003.
- Assess the EV-ECU as a possible cause.
- Assess whether coolant is insufficient.
- Assess the water pump as a possible cause.
- Assess the radiator fan as a possible cause.
- Evaluate the applicable temperature-sensor condition; the supplied excerpt cites an input-diode-area temperature sensor criterion above 110°C (230°F).
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied material identifies possible causes but does not provide a verified repair resolution in the excerpt.
14. Affected vehicles
- Mitsubishi i-MiEV · 2012–2013 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-20-54-003, published by NHTSA as Manufacturer Communication PDF 10175779 on 2020-04-22. The supplied excerpt references P1D40, a 110°C (230°F) input-diode-area temperature-sensor criterion, and a charging-stop fail-safe statement.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official source: NHTSA Manufacturer Communication PDF 10175779, Mitsubishi 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 P1D40 mean?
The supplied database title labels it “Inverter Output Current.” The verified TSB excerpt also places P1D40 alongside an input-diode-area temperature-sensor criterion above 110°C (230°F). The exact relationship is not further established by the supplied evidence.
Will P1D40 stop charging?
The supplied TSB excerpt states that charging is stopped under the referenced fail-safe and backup function.
What can cause P1D40?
The supplied TSB excerpt lists EV-ECU failure, insufficient coolant, water-pump failure, and radiator-fan failure as probable causes. It also references a temperature-related condition.
Can I drive with P1D40?
Not yet established by verified evidence.
Which vehicles does this evidence apply to?
The supplied applicability record is for U.S.-market 2012–2013 Mitsubishi i-MiEV vehicles.