P0A7FWysoki
Pogorszenie sprawności baterii HV — niska SOH
Układ napędowy
Sprawdź szczegóły →P0B20
WysokiHybrid Battery Pack Voltage Sensor 'D' Circuit Low Voltage. The battery control module has detected too low voltage in the traction pack measurement branch 'D'.
OBD-II (EN): Hybrid Battery Pack Voltage Sensor D Circuit Low Voltage
Code P0B20 indicates too low voltage in the 'D' sensor circuit of the hybrid battery pack – this means a problem with monitoring one of the traction battery segments. The cause may be a faulty sensor, an open circuit in the wires, or degradation of the battery cells. Due to the presence of high voltage, diagnosis and repair should be entrusted to an authorized hybrid vehicle service center.
Symptoms
- Hybrid system warning on the dashboard (MIL/warning light) - Reduced or no electric assist (fail-safe mode) - Reduced traction power of the hybrid vehicle - Possible deactivation of the energy recovery system (regeneration) - Traction battery may not charge or discharge abnormally
Possible causes
- Faulty or corroded voltage sensor in battery pack module 'D' - Open circuit or short circuit in the voltage measurement circuit wiring harness - Oxidized or loose electrical connectors in the sensor circuit - Faulty battery control module (BCM/BMU) - Physical damage or degradation of cells in HV pack segment 'D'
Affected systems
Pakiet baterii trakcyjnej (HV)Moduł sterowania baterią (BCM/BMU)Układ hybrydowyObwód czujnika napięciaWiązka przewodów wysokiego napięcia
Related codes
P0A80Krytyczny
Wymiana baterii hybrydowej — wymagana
Układ napędowy
Sprawdź szczegóły →Suggested Hybspec services
Based on the systems affected by this code, we will most likely start with:
Does code P0B20 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.