Mitsubishi P1B76
Return to Step 1. NO : The diagnosis is complete. DTC P1B77 Quick Charger Dis-CHG. Current 4 CAUTION If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prio
Quick answer
P1B76 is documented by Mitsubishi service information for certain U.S. i-MiEV vehicles as an EV-ECU DTC requiring a defined diagnostic procedure. Verified evidence states that, if P1B76 remains stored during the procedure, the BMU is replaced and the code is rechecked. The supplied evidence does not establish a plain-language fault definition for P1B76.
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 P1B76 mean?
P1B76 is documented by Mitsubishi service information for certain U.S. i-MiEV vehicles as an EV-ECU DTC requiring a defined diagnostic procedure. Verified evidence states that, if P1B76 remains stored during the procedure, the BMU is replaced and the code is rechecked. The supplied evidence does not establish a plain-language fault definition for P1B76.
2. Technical explanation
The verified Mitsubishi diagnostic evidence instructs technicians to check whether P1B76 is stored in the EV-ECU. In the cited procedure, a stored P1B76 leads to BMU replacement, followed by DTC erasure, connection of a quick-charging gun/connector or external power-supply equipment, and a repeat check for the DTC. If P1B76 is stored again, the procedure returns to Step 1; if it is not stored again, the diagnosis is complete. The supplied evidence also warns that CAN bus line problems can cause an incorrect DTC to be stored or set, and directs CAN bus diagnosis before the related diagnostic procedure. Not yet established by verified evidence: the exact expanded definition, electrical failure mode, or root cause represented by P1B76.
3. What system is affected?
EV-ECU and BMU are identified in the verified diagnostic procedure. CAN bus lines are also identified as relevant because communication faults may result in an incorrect DTC.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- A P1B76 DTC stored or set in the EV-ECU is established by the supplied service procedure.
- No driver-observable symptoms are established by verified evidence.
6. Possible causes
- A condition leading the Mitsubishi procedure to direct BMU replacement when P1B76 is stored.
- CAN bus line problems may cause an incorrect DTC to be stored or set.
- The specific underlying cause of P1B76 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
- Arrange diagnosis by a qualified Mitsubishi EV service provider.
- Do not attempt BMU replacement or high-voltage diagnostic work yourself.
- Provide the technician with the stored P1B76 code and any scan-report details.
10. Step-by-step troubleshooting
- A qualified technician should follow the applicable Mitsubishi EV-ECU diagnostic procedure.
- The verified procedure includes checking whether P1B76 is stored, clearing the DTC, connecting quick-charging or external power-supply equipment, and checking whether the DTC returns.
- The supplied evidence directs diagnosis of CAN bus lines before the related procedure because CAN faults can cause an incorrect DTC.
- If P1B76 remains stored at the specified decision point, the procedure directs BMU replacement, followed by verification that the DTC does not return.
11. When to contact service
Service by a qualified Mitsubishi EV technician is appropriate because the documented procedure involves EV-ECU diagnosis, CAN bus diagnosis, BMU replacement, and charging/external power-supply equipment.
12. What the service center may check
- Confirm whether P1B76 is stored or set in the EV-ECU.
- Diagnose CAN bus lines before the related diagnostic procedure, as directed by the bulletin.
- After the specified repair step, erase the DTC.
- Connect the quick-charging gun/connector or external power-supply equipment as specified in the procedure.
- Check whether P1B76 is stored or set again.
13. Possible repair or resolution
- The verified procedure directs replacement of the BMU when P1B76 is stored at the specified diagnostic decision point.
- After BMU replacement, the procedure requires a DTC clear-and-recheck process using quick-charging or external power-supply equipment.
- If P1B76 is not stored or set again during the verification check, the diagnosis is complete.
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; NHTSA Manufacturer Communication PDF 10158409: https://static.nhtsa.gov/odi/tsbs/2019/MC-10158409-9999.pdf
- Mitsubishi TSB-19-54-005, published March 13, 2019; NHTSA Manufacturer Communication PDF 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 official evidence consists of NHTSA-hosted Mitsubishi manufacturer communications TSB-19-54-004 and TSB-19-54-005. The supplied database identifies applicability to U.S. Mitsubishi i-MiEV model years 2014 and 2016.
19. Frequently asked questions
What does P1B76 mean?
The supplied verified evidence does not provide a plain-language definition for P1B76. It identifies P1B76 as a DTC checked in the EV-ECU within a Mitsubishi diagnostic procedure.
What vehicles are covered by the supplied evidence?
The supplied applicability data identifies U.S. Mitsubishi i-MiEV vehicles for model years 2014 and 2016.
Could a CAN bus issue be involved?
Yes. The cited Mitsubishi material states that a problem in the CAN bus lines can cause an incorrect DTC to be stored or set and directs CAN bus diagnosis before the related procedure.
What repair does the documented procedure specify?
At the stated diagnostic decision point, if P1B76 is stored, the procedure directs replacement of the BMU and then a DTC recheck. This does not establish that BMU replacement is appropriate in every case without completing the applicable diagnostic process.
Is it safe to drive or charge with P1B76?
Not yet established by verified evidence.