Mitsubishi P1B75
ECU. (1) Erase the DTC. (2) Connect the quick charging connector or an external power supply equipme nt to charge or discharge the battery completely. (3) Check if the DTC is set
Quick answer
P1B75 is a Mitsubishi EV-ECU diagnostic code documented for 2014 and 2016 US i-MiEV vehicles. Verified service information directs technicians to diagnose CAN bus lines first, then recheck the code after connecting quick-charging or external power-supply equipment. If the code remains after the specified diagnostic process, the bulletin directs replacement of the BMU.
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 P1B75 mean?
P1B75 is a Mitsubishi EV-ECU diagnostic code documented for 2014 and 2016 US i-MiEV vehicles. Verified service information directs technicians to diagnose CAN bus lines first, then recheck the code after connecting quick-charging or external power-supply equipment. If the code remains after the specified diagnostic process, the bulletin directs replacement of the BMU.
2. Technical explanation
The supplied Mitsubishi service-bulletin evidence describes a diagnostic sequence for P1B75. A technician uses scan tool MB991958 to diagnose the CAN bus lines. If the CAN check is not normal, the bulletin directs repair of the CAN bus line and then a DTC recheck. For the recheck, the DTC is erased, quick-charging equipment or external power-supply equipment is connected to charge or discharge the battery completely, and the EV-ECU is checked for P1B75 again. If P1B75 is still stored, the diagnostic process continues through additional checks. The supplied evidence states that replacement of the BMU is directed when P1B75 is stored at the cited point in the procedure. The bulletin also cautions that CAN bus problems can result in an incorrect DTC.
3. What system is affected?
EV-ECU, CAN bus lines, and BMU are identified in the verified service information. The exact system name is not otherwise established by the supplied evidence.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
Not yet established by verified evidence.
6. Possible causes
- A CAN bus line problem may result in an incorrect DTC, according to the Mitsubishi bulletin.
- A BMU-related repair outcome is specified in the bulletin when P1B75 remains stored at the cited diagnostic step.
- Any further cause is 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?
Not yet established by verified evidence.
9. What you can safely do
- Have the vehicle evaluated using the applicable Mitsubishi diagnostic procedure.
- Do not attempt high-voltage, CAN-bus, BMU, quick-charging, or external-power-supply repairs without qualified EV service training and appropriate equipment.
10. Step-by-step troubleshooting
- A qualified technician diagnoses the CAN bus lines using scan tool MB991958.
- If the CAN bus-line check is not normal, the bulletin directs repair of the CAN bus line followed by a P1B75 recheck.
- For the recheck, erase the DTC, connect the quick-charging connector or external power-supply equipment to charge or discharge the battery completely, then check whether P1B75 is set in the EV-ECU.
- If P1B75 is not set during this recheck, the bulletin states that diagnosis is complete.
- If P1B75 remains set, continue with the applicable Mitsubishi diagnostic procedure, including the current-sensor check identified in the bulletin.
11. When to contact service
Contact a Mitsubishi dealer or qualified EV service provider for diagnosis under the applicable P1B75 procedure. The verified bulletin requires specialized scan-tool diagnosis and work involving charging or external power-supply equipment.
12. What the service center may check
- CAN bus-line diagnosis using scan tool MB991958.
- P1B75 DTC recheck in the EV-ECU after erasing the code and connecting quick-charging or external power-supply equipment.
- Current-sensor check is identified as a subsequent diagnostic step in the supplied bulletin.
13. Possible repair or resolution
- Repair the CAN bus line if its diagnostic result is not normal, then recheck P1B75.
- Replace the BMU when directed by the applicable bulletin diagnostic path after P1B75 remains stored.
- No other repair resolution is established by the supplied evidence.
14. Affected vehicles
- Mitsubishi i-MiEV · 2014 · US
- Mitsubishi i-MiEV · 2016 · US
15. Related TSBs / service bulletins
- Mitsubishi TSB-19-54-004, published March 13, 2019: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
- Mitsubishi TSB-19-54-005, published March 13, 2019: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf
16. Recall information
No recall relationship is established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted Mitsubishi manufacturer communications TSB-19-54-004 and TSB-19-54-005 provide the verified diagnostic evidence for this page.
19. Frequently asked questions
What does P1B75 apply to?
The supplied applicability evidence identifies US-market 2014 and 2016 Mitsubishi i-MiEV vehicles.
Can a CAN bus fault affect P1B75?
Yes. The verified Mitsubishi bulletin states that a problem in the CAN bus lines can cause an incorrect DTC to be stored.
Does P1B75 always require BMU replacement?
Not based on the supplied evidence. The bulletin first requires CAN diagnosis and DTC rechecking. It directs BMU replacement at a specified point when P1B75 is stored.
Is it safe to drive or charge with P1B75?
Not yet established by verified evidence.