Faults in the Renault ZOE’s BCB: When the Electrical Network Burns Out the Infineon IGBT.servo-user3 de September de 2025
What is the BCB in the Renault ZOE?
The BCB (Boîtier de Charge Bord) is the on-board charging module responsible for transforming the alternating current from the grid into direct current to recharge the battery.
It is an essential component: without it, the Renault ZOE cannot charge properly.
The silent enemy: an unstable mains supply
The most common cause of BCB faults is not the car itself, but unstable mains supply conditions.
Typical problems that damage the system:
Voltage spikes (overvoltages)
Voltage drops (undervoltages)
Harmonics and electrical signal distortion
Installations without adequate protection
These phenomena force the BCB to operate outside its normal parameters, damaging one of its most sensitive components: the Infineon IGBT.
The critical point: burning of the Infineon IGBT
The Infineon IGBT (Insulated Gate Bipolar Transistor) acts as an ‘electronic power switch’ within the BCB.
When the network experiences power spikes or fluctuations:
The IGBT withstands more current and heat than expected
It overheats quickly
It can burn out, causing total failure of the BCB
This type of failure is very common in Renault ZOEs and usually results in the need to repair or replace the BCB.
Symptoms of IGBT/BCB failure
The car does not charge even when connected.
Errors related to the charging system on the dashboard.
Frequent charging interruptions.
In some cases, burning smell or overheating in the charger area.
How to protect the BCB and IGBT.
To prevent the Infineon IGBT from burning out in your Renault ZOE:
Always charge at approved and protected charging points.
Install surge protectors in your domestic electrical network.
Avoid using low-quality plugs or extension cords.
If you live in areas with an unstable network, consider using a voltage stabiliser
Perform preventive maintenance to detect anomalies before the fault becomes irreversible
The BCB of the Renault ZOE is a vital component, but it is vulnerable to the quality of the electrical network.
Power surges and fluctuations not only damage the system, but can also cause the Infineon IGBT to burn out, leaving your car unable to charge.
✅ The next images show the Renault Zoe charged after the BCC repair.
✅ At SERVO MOTORS ADJUST, we specialise in repairing and preventing BCB faults in Renault ZOEs.
If your car has charging problems, we can help you diagnose, repair and protect the system to prevent future breakdowns.
