A2054400073 Auxiliary Battery Voltage Converter

A2054400073 Voltage converter Auxiliary Battery.

A205 440 00 73 replacement voltage converter is factory fitted to many different mercedes-benz cars such as C W205 S205 C205 GLC C253 E W213 S213 C238 S W222.

Replacement voltage converter is direct replacement for mercedes-benz brand parts.

It is used in Eco Stop Start function and it recharged by regenerative braking system.

Mercedes voltage converter location is at the passenger front side footwell place.

To access and replace part you will need to remove some protection parts, move carpet a little bit backwards and under the second layer of protection part you will find and access auxiliary battery voltage converter.

Capacitor is located at the same place for all cars.

What is the failure symptoms of Mercedes-Benz voltage converter?

The most common issue and symptom of failing voltage converter is blinking Auxiliary Battery Malfunction warning message on the dashboard.

Once you see this fault message there is no need to visit dealer shop and do secondary diagnostic and spend extra money as dealer suggests.

No coding is required after replacing voltage module.

The most common Mercedes-Benz warning messages

• Auxiliary Battery Malfunction
• Backup-batteri Fejl
• Batterie de reserve defaut
• Bateria auxiliar falha
• Batería auxiliar Avería
• Backup Batterie Störung
• Backup-batterie Fejl
• Backup-batteri störning
• Zalozni akumulator Porucha
• Backup accu Storing
• Backup batteria anomalia
• Usterka akumulatora dodatkowego
• Yedekleme akusu Ariza

The most common diagnostic trouble codes DTCs

• B21DC01 - The buffer battery of the electronic ignition lock has a malfunction. There is a general electrical fault
• B21DC01 The buffer battery of the electronic ignition switch (EIS/EZS) is faulty. A general electrical fault exists

Mercedes-Benz part numbers:

• A205 440 00 73
• A2054400073

Compatible Mercedes-Benz cars:

• C Cass W205 Saloon Sedan
• C Class S205 Estate Touring
• C Class A205 Cabriolet Convertible
• C Class C205 Coupe
• C Class 2014 2015 2016 2017 2018
• C Class C180 C200 C220 BlueTec C250 C300 C350 C400 C450 C43 C450 C63 AMG
• CLC W257 2017 2018 2019
• E Class W213 Sedan
• E Class S213 Estate
• E Class C238 Coupe
• E Class A238 Convertible
• E Class 2016 2017 2018 2019
• E Class E200 E250 E300 E350e Hybrid E400 E450 E200d E220d E300d E350d E400d 4MATIC E43 AMG
• GLC X253 C253 W253 Hatchback Coupe 2015 2016 2017 2018 2019
• GLC GLC300 GLC350e GLC250d GLC350d GLC300 GLC43 AMG
• S Class W222 Sedan 2013 2014 2015 2016 2017 2018
• S Class C217 Coupe 2013 2014 2015 2016 2017 2018
• S Class S300 BlueTec S320 S350 S400 S500 S550 S65 S63 AMG

Please note: this list is not full, sensor may fit other car models as well.