What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1B77High Voltage Battery Pre-Charging faultManufacturer communications
16Original wording in English
KIA
Reported code forms P1B7700
TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: PDC LOGIC IMPROVEMENT AND PRA REPLACEMENT FOR DTC PIB7700 (SC343) - This bulletin has been revised to include additional information. New/revised sections of this…
KIA
Reported code forms P1B7700
TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN (SC343) - This bulletin provides information to upgrade the Powernet Domain Control ‘PDC’ system software on certain 2025MY EV6 (CV1a) vehicles produced from…
KIA
Reported code forms P1B77
TECHNICAL SERVICE BULLETIN: SERVICE ACTION: MOTOR CONTROL UNIT (MCU) LOGIC IMPROVEMENT (SA596) - This bulletin provides the procedure to update the Motor Control Unit (MCU) software on certain 2025MY Sorento HEV (MQ4…
GENESIS
Reported code forms P1B77
This bulletin provides important special service instructions to properly repair a vehicle that has been diagnosed to require an Integrated Charge Control Unit (ICCU) replacement, such as required for DTC P1A9096 DC to…
HYUNDAI
Reported code forms P1B77
This bulletin provides important special service instructions to properly repair a vehicle that has been diagnosed to require an Integrated Charge Control Unit (ICCU) replacement, such as required for DTC P1A9096 DC to…
KIA
Reported code forms P1B77
TECHNICAL SERVICE BULLETIN: SERVICE ACTION: BMS/OPU/MCU LOGIC IMPROVEMENT (SA411) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in…
Check vehicle applicability
36A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Genesis | GV60 EV | 2024 |
| Genesis | GV60 EV | 2023 |
| Genesis | GV70 ELECTRIFIED | 2024 |
| Genesis | GV70 ELECTRIFIED | 2023 |
| Genesis | GV80 EV | 2024 |
| Genesis | GV80 EV | 2023 |
| Hyundai | IONIQ 5 | 2024 |
| Hyundai | IONIQ 5 | 2023 |
| Hyundai | IONIQ 5 | 2022 |
| Hyundai | IONIQ 6 | 2024 |
| Hyundai | IONIQ 6 | 2023 |
| Hyundai | IONIQ HYBRID | 2019 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.