Auxiliary Battery Voltage Converter fit Compatible With Mercedes W205 - A2059053414

Voltage Converter Module / Auxiliary Battery

For Mercedes-Benz C-Class W205, E-Class W213, S-Class W222, GLC-Class, CLS & More
Part Number: A2059053414 (Replaces A2059052809, A2054400073)
OEM Quality Replacement Component

Product Overview

Restore your vehicle’s Eco Start/Stop functionality and electrical efficiency with this OEM-quality voltage converter module (auxiliary battery). This component is a Mercedes-Benz-recommended replacement part and is crucial for powering low-voltage systems and buffering the electronic ignition system.

Built to meet or exceed original factory specifications, this voltage converter offers long-lasting reliability and is a direct-fit part for a wide range of Mercedes-Benz models.

Key Features

• OEM Quality – Recommended replacement for the original factory part

• No Coding Required – Simple plug-and-play installation

• Supports Start/Stop Functionality – Recharges via regenerative braking

• Direct Replacement – Designed to fit seamlessly without modifications

Part Numbers

• Primary Part Number: A2059053414

• Also Replaces:
   A205 905 34 14, 2059053414, A2059052809, 2059052809,
   A2054400073, 2054400073, MA2059053414, 205-905-34-14-80, A205905341480

Vehicle Compatibility

C-Class (W205/S205/C205/A205) – 2014–2018

• C180, C200, C220d, C250, C250d, C300, C350e, C400, C43 AMG, C63 AMG

E-Class (W213/S213/C238/A238) – 2016–2019

• E200, E220d, E250, E300, E300d, E350e, E350d, E400, E400d, E450, E43 AMG

S-Class (W222/C217) – 2013–2018

• S300 BlueTec, S320, S350, S400 Hybrid, S450, S500, S550, S63 AMG, S65 AMG

GLC-Class (X253/C253/W253) – 2015–2019

• GLC200, GLC220d, GLC250d, GLC300, GLC350d, GLC43 AMG, GLC63 AMG

CLS-Class (W257) – 2017–2019

• CLS200, CLS220d, CLS300, CLS300d, CLS350, CLS400d, CLS450, CLS53 AMG

⚠️ This list may not be exhaustive. Please verify part compatibility using your VIN or consult with your technician.

Function & Location

• Purpose: Maintains stable voltage for auxiliary systems, supports Eco Start/Stop

• Common Symptoms of Failure:
   – “Auxiliary Battery Malfunction”
   – “Stop Vehicle, Shift to P, Leave Engine Running”

• Location: Passenger side footwell, behind protective paneling under the carpet

• Diagnostic Code (DTC): B21DC01 – Electrical fault in ignition lock buffer battery

Installation Notes

• Located at the passenger front footwell

• Requires removal of carpet and a protective cover

• No dealer diagnostic or coding necessary post-installation

• Video tutorial and blog available for DIY guidance

What's in the Box

• 1 × Voltage Converter Auxiliary Battery Module (A2059053414)