We regenerate control units for Mercedes vehicles!
We offer a professional service for removing permanent error codes from high-voltage battery control units.
Thanks to specialized software and our experience with hybrid and electric systems, we can safely diagnose and remove permanently stored faults that may affect vehicle performance or limit its functionality. This service restores full functionality to the battery management system and helps prevent unnecessary restrictions in the operation of the drivetrain.
Why is a quick diagnosis crucial?
Both errors relate to systems responsible for the vehicle’s core functions – starting, power supply, and energy management. Neglecting them may lead to:
– permanent damage to electronic modules
– depletion of the main traction battery
– critical errors in the BMS (Battery Management System)
– inability to start the vehicle
What does a professional battery diagnosis look like in an electric vehicle?
At our service center, we use the authorized Xentry Diagnosis system, which allows for:
– reading and analyzing errors from BMS systems
– detailed battery capacity check (e.g. 43.56Ah vs. declared 43Ah)
– voltage measurement of each individual cell – we verify, for example, 100 cells separately
– monitoring the operating temperature of the HV module
– assessing insulation condition and the safety of the high-voltage installation
– detecting issues with software and module firmware versions
The photos show the correct operation of the battery:
Error codes related to high-voltage battery sensors and voltage:
P0B1000 – Current Sensor B (HV battery) – Short to ground
Indicates a short circuit in the current sensor circuit, which may interfere with accurate current measurement in the high-voltage battery.
P0B1600 – Voltage Sensor B (HV battery) – Short to ground
Similar to the above, but relates to a short circuit in the voltage measurement circuit – this may lead to incorrect voltage readings in the battery.
P1CC100 – HV battery voltage monitoring – Voltage too low or external signal too low
The system detected that the battery voltage has dropped below the threshold or there is an abnormal signal from an external sensor.
P1CC200 – HV battery voltage monitoring – Voltage too low or external signal too low
A second variant of the same type of fault – possibly affecting a different voltage range or testing condition.
P06B400 – Sensor voltage supply 2 – Short to ground
The power supply circuit for sensor group no. 2 (e.g. temperature, voltage, current sensors) has a short to ground – this may lead to multiple components failing at once.
Error codes related to the HV battery control unit:
P060A00 – HV battery controller – Faulty monitoring
A general internal controller error – may indicate a problem with logic processing or controller components.
P056200 – HV battery controller – Supply voltage too low
The controller’s own power supply has dropped below the acceptable level – can cause unstable operation or restarts.
U300100 – HV battery controller – Watchdog output malfunction
The “watchdog” is a safety mechanism to prevent the controller from freezing – if the system detects no response, this error is triggered.
Communication error codes with sensors:
U064A00 – HV battery current sensor A – Communication error
No or disrupted communication with sensor A, which may prevent correct battery current measurement.
U01A000 – HV battery sensor module A – CAN communication fault
A specific CAN bus problem with sensor module A – may be caused by a broken wire or software issue.
U01A100 – HV battery sensor module B – CAN communication fault
A similar issue as above, but affecting sensor B.
Temperature-related error code:
P144600 – HV battery temperature sensor – Signal unclear (also affects cruise control)
The system received inconsistent temperature data – may impact cruise control or thermal protection functions of the battery.
Car Battery Service – What Do We Offer?
🔧 Full diagnostics of power systems
🔋 BMS20PT30
🧠 BMS system diagnosis and firmware update
⚙️ Service of high-voltage cells, modules, and connectors
🛠️ Repair of electronic ignition switch and 12V power supply
We work with components from Mercedes-Benz, BMW, Audi, Hyundai, Kia, and other EV and hybrid manufacturers.
Take care of the safety and performance of your electric vehicle
Car battery service is not just about repairs – it’s also prevention and optimization.
A properly performed diagnosis allows you to:
– prevent serious failures
– restore 100% battery performance
– extend the vehicle’s lifespan
– maintain full charging efficiency
Contact us
Contact us: click here
📍 We operate locally and offer mobile service – we’ll come to you if the issue prevents the vehicle from starting.
Don’t ignore the warning signs your car is sending – take care of your battery management system today.
