Mitsubishi P1ADF
SAFE AND BACKUP FUNCTION Not available . PROBABLE CAUSES The 12V starter battery is failed. M S B -
Quick answer
For a 2016 US Mitsubishi i-MiEV, DTC P1ADF indicates the BMU control power-supply voltage was detected below 8 V or above 16 V after BMU activation. The cited Mitsubishi TSB identifies a failed 12 V starter battery as a probable cause.
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 P1ADF mean?
For a 2016 US Mitsubishi i-MiEV, DTC P1ADF indicates the BMU control power-supply voltage was detected below 8 V or above 16 V after BMU activation. The cited Mitsubishi TSB identifies a failed 12 V starter battery as a probable cause.
2. Technical explanation
The verified TSB labels P1ADF as “+B Line Voltage.” It is checked every time after the BMU is activated. The fault is judged when BMU control-power voltage is less than 8 V or greater than 16 V. The TSB states that the fail-safe and backup function is not available.
3. What system is affected?
BMU control power supply / +B line.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Fail-safe and backup function not available.
6. Possible causes
- The 12 V starter battery is failed.
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
- Do not attempt high-voltage battery repair based on this code alone.
- Arrange diagnosis by a qualified Mitsubishi EV service provider.
10. Step-by-step troubleshooting
- The cited TSB directs confirmation of whether diagnostic trouble codes reset after 10 seconds.
- If P1ADF is set, the cited TSB directs replacement of the main drive lithium-ion battery assembly.
- If P1ADF is not set, the cited TSB identifies an intermittent malfunction and refers to Mitsubishi intermittent-malfunction troubleshooting procedures.
11. When to contact service
Service evaluation is appropriate because the verified TSB contains a directed diagnostic path and potential main drive lithium-ion battery assembly replacement.
12. What the service center may check
- Check whether P1ADF resets after 10 seconds, following the applicable Mitsubishi procedure.
- Evaluate the 12 V starter battery, identified in the TSB as a probable cause.
- If the DTC remains set, follow the TSB direction to replace the main drive lithium-ion battery assembly.
13. Possible repair or resolution
- Replace the main drive lithium-ion battery assembly if P1ADF is confirmed set under the cited TSB procedure.
- If the DTC does not reset, treat it as an intermittent malfunction according to Mitsubishi troubleshooting guidance.
14. Affected vehicles
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-005, published through NHTSA as Manufacturer Communication MC-10158410 (March 13, 2019). It includes DTC P1ADF +B Line Voltage diagnostic information for the verified application.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified official source: NHTSA-hosted Mitsubishi TSB-19-54-005, MC-10158410: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf
19. Frequently asked questions
What does Mitsubishi i-MiEV code P1ADF mean?
The verified TSB identifies P1ADF as “+B Line Voltage” and sets it when BMU control-power voltage is below 8 V or above 16 V after BMU activation.
What vehicle is this evidence verified for?
2016 Mitsubishi i-MiEV vehicles in the US.
Is the 12 V battery relevant to P1ADF?
Yes. The cited TSB lists a failed 12 V starter battery as a probable cause.
Does P1ADF prove the high-voltage battery has failed?
Not by itself. The TSB’s diagnostic procedure directs main drive lithium-ion battery assembly replacement only if the DTC is confirmed set under that procedure.