Mitsubishi B1439
52B-004
Quick answer
For specified U.S. Mitsubishi i-MiEV model years, DTC B1439 is documented in Mitsubishi SRS air-bag diagnostic material. The supplied evidence identifies its canonical meaning as “52B-004,” but does not establish a plain-language fault definition, driving/charging status, symptoms, or repair procedure.
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.
Videos are supporting material and never override OEM or regulator evidence.
1. What does B1439 mean?
For specified U.S. Mitsubishi i-MiEV model years, DTC B1439 is documented in Mitsubishi SRS air-bag diagnostic material. The supplied evidence identifies its canonical meaning as “52B-004,” but does not establish a plain-language fault definition, driving/charging status, symptoms, or repair procedure.
2. Technical explanation
Verified NHTSA-posted Mitsubishi manufacturer communications state that the i-MiEV service-manual diagnostic information for DTCs B1438 and B1439 required correction. The relevant material is in Group 52B, Supplemental Restraint System (SRS), under SRS Air Bag Diagnosis and SRS-ECU diagnostic trouble-code procedures. For 2016–2017 i-MiEV, TSB-18-52B-004 directs replacement of incorrect information with correct information for B1438 and B1439 diagnosis. Separate bulletins provide corresponding manual corrections for 2012 and 2013–2014 coverage.
3. What system is affected?
Supplemental Restraint System (SRS), including SRS air-bag diagnosis and SRS-ECU DTC procedures.
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
- 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
- Use the applicable Mitsubishi service-manual diagnostic information corrected by the listed bulletin.
- Do not rely on the pre-correction B1439 diagnostic information where the applicable bulletin directs replacement.
10. Step-by-step troubleshooting
- Confirm the vehicle is within the verified applicability range: U.S.-market Mitsubishi i-MiEV, model years 2012, 2013–2014, or 2016–2017.
- Refer to Group 52B, Supplemental Restraint System (SRS), SRS Air Bag Diagnosis, and SRS-ECU DTC procedures.
- For the applicable model year, use the corrected B1439 diagnosis referenced by the corresponding Mitsubishi bulletin.
11. When to contact service
Service need is not yet established by verified evidence. Because this code is documented under SRS diagnostic procedures, use a qualified Mitsubishi service provider or technician with access to the corrected applicable service information.
12. What the service center may check
- Verify DTC B1439 using the SRS-ECU diagnostic procedure.
- Determine the model year and use the corresponding corrected service-manual information referenced by the applicable bulletin.
- Confirm whether the diagnostic information being used incorporates the correction for B1439.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Mitsubishi i-MiEV · 2012 · US
- Mitsubishi i-MiEV · 2013–2014 · US
- Mitsubishi i-MiEV · 2016–2017 · US
15. Related TSBs / service bulletins
- TSB-18-52B-002, published December 20, 2018: Corrects 2012 i-MiEV service-manual diagnostic information for DTCs B1438 and B1439 in Group 52B SRS material.
- TSB-18-52B-003, published December 20, 2018: Corrects 2013 (Canada only) and 2014 i-MiEV service-manual diagnostic information for DTCs B1438 and B1439 in Group 52B SRS material.
- TSB-18-52B-004, published December 20, 2018: Corrects 2016 and 2017 i-MiEV service-manual diagnostic information for DTCs B1438 and B1439 in Group 52B SRS material.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA-posted Mitsubishi communications: TSB-18-52B-002 (MC-10152960), TSB-18-52B-003 (MC-10152959), and TSB-18-52B-004 (MC-10152961), all published December 20, 2018.
19. Frequently asked questions
What does Mitsubishi DTC B1439 mean?
The supplied diagnostic record gives the canonical meaning as “52B-004.” A plain-language fault definition is not yet established by verified evidence.
Which vehicles are covered by the verified evidence?
U.S. Mitsubishi i-MiEV model years 2012, 2013–2014, and 2016–2017 are listed in the supplied applicability data. One bulletin summary also refers to 2013 Canada-only coverage, but that market applicability is not included in the supplied applicability records.
Is B1439 related to the electric-drive or charging system?
Not established by the supplied evidence. The verified documents place B1439 under Group 52B Supplemental Restraint System (SRS) and SRS-ECU diagnostic procedures.
Does the bulletin provide a repair?
The supplied evidence establishes that Mitsubishi corrected the B1439 diagnosis in service-manual information. It does not establish a specific repair or parts replacement.