P1B77 on the 2019 Hyundai Ioniq
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| Campaign T3U Dea | 2019-09-30. Service bulletin. This service campaign provides information related to a BMS software update to the diagnostic logic for DTC P1B77 ? ?High Voltage Battery Pre-charging Fault?. |
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| 19-01-023H | 2019-09-30. Service bulletin. This bulletin provides information related to a BMS (Battery Management System) software update to the diagnostic logic for DTC P1B77 ? ?High Voltage Battery Precharging Fault?. |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.