Czujnik napięcia akumulatora trakcyjnego układu hybrydowego E – zakres/wydajność obwodu. Sterownik wykrył nieprawidłowe odczyty napięcia z czujnika E baterii wysokiego napięcia.
P0B40
WysokiHybrid/EV Battery Voltage Sensor 'B' Circuit – Incorrect signal or open circuit detected in the high-voltage pack voltage monitoring circuit.
OBD-II (EN): Hybrid/EV Battery Voltage Sensor Circuit B
Code P0B40 signals a problem with the voltage sensor circuit for section 'B' of the hybrid or electric battery – the control module has detected a signal outside the permissible range or no signal. The cause may be a faulty sensor, a wiring harness fault, or a problem with the traction battery pack itself. Due to the high operating voltages of the HV system, diagnosis and repair should be entrusted to an authorized service center with appropriate equipment.
Symptoms
• Hybrid or electric system warning on the dashboard • MIL (Check Engine) or dedicated HV system warning light • Reduced drive power / fail-safe mode (limp mode) • Reduced electric range or complete shutdown of EV drive • Possible problems with charging the traction battery • Incorrect state of charge (SOC) indications on the gauge
Possible causes
• Faulty or defective voltage sensor for HV pack module 'B' • Open circuit, short circuit, or corrosion in the voltage measurement circuit wiring harness • Faulty Battery Management System (BMS/HV ECU) – incorrect signal interpretation • Discharged or damaged traction battery module (cell/block) causing out-of-range voltage • Poor plug connections on the voltage sensor connector or battery module • Electromagnetic interference or moisture ingress into the measurement system
Affected systems
Related codes
Niski prąd silnika napędowego 'A' — wykryto problem z wydajnością modułu sterowania silnikiem napędowym/generatorem w układzie hybrydowym lub elektrycznym.
Wymiana baterii hybrydowej — wymagana
Suggested Hybspec services
Based on the systems affected by this code, we will most likely start with:
Sources and further reading
Does code P0B40 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.
