EV Diagnostics
Verified EV diagnostic knowledge page

Mitsubishi P1B72

Return to Step 1. NO : The diagnosis is complete. DTC P1B76 Quick Charger Dis-CHG. Current 3 CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prio

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a qualified Mitsubishi EV service facility for CAN-bus diagnosis and the manufacturer-specified P1B72 confirmation procedure.
Confidence95%

Quick answer

For applicable U.S. Mitsubishi i-MiEV vehicles, model years 2014 and 2016, verified Mitsubishi service information indicates that if DTC P1B72 remains stored after the specified confirmation procedure, the Battery Management Unit (BMU) is replaced and the test is repeated. CAN-bus diagnosis is required first because CAN faults can cause an incorrect DTC to be stored.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

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 P1B72 mean?

For applicable U.S. Mitsubishi i-MiEV vehicles, model years 2014 and 2016, verified Mitsubishi service information indicates that if DTC P1B72 remains stored after the specified confirmation procedure, the Battery Management Unit (BMU) is replaced and the test is repeated. CAN-bus diagnosis is required first because CAN faults can cause an incorrect DTC to be stored.

2. Technical explanation

The supplied official Mitsubishi technical-service information identifies a confirmation process for P1B72 in the EV-ECU: erase stored DTCs, connect a quick-charging gun/connector or external power-supply equipment, then check whether P1B72 is stored again. If P1B72 is stored again, the bulletin directs replacement of the BMU followed by the confirmation procedure again. If it is not stored again, the diagnosis is complete. The evidence also cautions that a CAN-bus problem can result in an incorrect P1B72; CAN-bus lines are to be diagnosed before this diagnostic procedure.

3. What system is affected?

Battery Management Unit (BMU), EV-ECU, quick-charging/external power-supply communication, and CAN-bus lines.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • P1B72 stored or set in the EV-ECU.

6. Possible causes

  • A CAN-bus line problem can cause an incorrect P1B72 to be stored or set.
  • If P1B72 remains stored after the specified confirmation procedure, Mitsubishi service information directs BMU replacement. The underlying component-level failure mechanism is not further established by the supplied 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

  • Arrange diagnosis by a qualified Mitsubishi EV service facility.
  • Have CAN-bus lines diagnosed before P1B72-specific diagnosis, as directed by Mitsubishi service information.
  • Do not attempt high-voltage or BMU repair procedures yourself.

10. Step-by-step troubleshooting

  1. A qualified technician should first diagnose the CAN-bus lines.
  2. Using the applicable Mitsubishi procedure, erase the stored DTC in the EV-ECU.
  3. Connect the quick-charging connector/gun or external power-supply equipment as specified by the procedure.
  4. Check whether P1B72 is stored or set again.
  5. If P1B72 is not stored or set again, the supplied procedure states that diagnosis is complete.
  6. If P1B72 is stored or set again, the supplied procedure directs BMU replacement, followed by repeating the confirmation procedure.

11. When to contact service

Contact a qualified Mitsubishi EV service facility for CAN-bus diagnosis and the manufacturer-specified P1B72 confirmation procedure.

12. What the service center may check

  • Check for P1B72 in the EV-ECU.
  • Diagnose CAN-bus lines before P1B72-specific diagnosis.
  • Erase stored DTCs, perform the specified quick-charge/external-power connection step, and recheck for P1B72.
  • After BMU replacement, repeat the specified confirmation procedure.

13. Possible repair or resolution

  • If P1B72 is stored again after the specified confirmation procedure, Mitsubishi service information directs replacement of the BMU.
  • If P1B72 is not stored again after the procedure, the diagnosis is complete according to the supplied Mitsubishi service information.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mitsubishi TSB-19-54-004, published March 13, 2019; available through NHTSA as Manufacturer Communication MC-10158409: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
  • Mitsubishi TSB-19-54-005, published March 13, 2019; available through NHTSA as Manufacturer Communication MC-10158410: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158410-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability: U.S.-market Mitsubishi i-MiEV model years 2014 and 2016. The cited official manufacturer communications are published by NHTSA.

19. Frequently asked questions

What does the verified service information say to do if P1B72 returns?

After CAN-bus diagnosis and the specified confirmation procedure, Mitsubishi service information directs replacement of the BMU if P1B72 is stored or set again.

Can a CAN problem cause P1B72?

Yes. The supplied Mitsubishi service information cautions that a problem in the CAN-bus lines can cause an incorrect DTC to be stored or set.

Does the evidence establish whether it is safe to drive or charge?

No. Driveability and charging safety are not yet established by verified evidence.

20. Sources & verification

Verified
Mitsubishi P1B72: Return to Step 1. NO : The diagnosis is complete.… | EV Diagnostics