In this complete guide, we will show you how to fix your Mercedes Benz 48V hybrid battery using CG100X or CG100 programmer. Say goodbye to battery problems, low power, and difficulty starting your vehicle.

Understanding Mercedes Benz 48V Hybrid Battery

The 48V electrical system in Mercedes Benz vehicles eliminates the need for drivetrain batteries, making the car safer by minimizing the risk of excessive electrical flow. However, issues with the hybrid battery can arise, leading to malfunctions and other problems.

Solution: CG100X or CG100 Prog 3 Devices Required for the Repair
To successfully repair the Mercedes Benz 48V hybrid battery, you will need either CG100X or CG100 Prog 3 programmer.

Repairing the Mercedes Benz 48V Hybrid Battery

Step 1: Identifying the Model and Symptoms
Before beginning the repair process, it's crucial to identify the affected model and the symptoms of the battery malfunction. Models such as W167, W205, W213, and W222 from 2015 onwards can encounter issues. Common symptoms include instrument cluster messages indicating the 48V on-board electrical system battery (G1/3) in yellow or red, as well as the vehicle failing to start.


Step 2: Common Fault Codes
Familiarize yourself with the common fault codes related to the Mercedes Benz 48V hybrid battery issues. These codes include B183349 (internal electrical fault), B183371 (actuator lock), B183384 (signal below the allowed limit), and B183319 (battery malfunction with blocked actuator).

Step 3: Causes of Battery Issues
Understanding the causes of battery issues is essential to address them effectively. Collisions, battery drain, and electrical short circuits are some of the factors that can lead to chip data lock on the BMS, resulting in battery malfunctions.

Step 4: Battery Replacement or Chip Data Modification
To resolve the battery issues, you have two options: either replace the battery or modify the chip data. Either way, it is crucial to charge the battery to the standard voltage after the repair. However, please note that the modification approach may vary depending on the engine type (M256 or M264), so ensure you confirm the engine type before proceeding.

Step 5: Repair Procedure
The repair procedure is similar for both straight and elbow battery modules. Here, we provide a step-by-step guide for repairing a 48V battery elbow type. Follow these instructions carefully:

Remove and disassemble the battery module.




Locate the IC chip 95M01, which controls the operation of the entire battery. You can find it when you open the upper case of the battery.


Use the CG100 software to select the appropriate options:
For CG100 Prog 3: Choose Programmer -> 8 foot chip -> 95M01.
For CG100X: Select BCM -> Benz -> 48V starter battery -> W167/W205/W213W222 -> 2015- 95M01.


Wiring Diagram and Connection:
CG100 programmer will display the wiring diagram required for the repair.
Solder IC chip to the BDM4 adapter and connect it to CG100 programmer.


Reading and Saving EEPROM Data: Use the CG100 programmer to read the original EEPROM data from the IC chip. Save the data for further processing.
Contact CG Engineer: Send the original EEPROM data to a CG engineer who specializes in Mercedes Benz repairs. They will modify the data and provide you with a modified BIN file.



Writing the Modified BIN File: Load the modified BIN file into the CG100 programmer and write it to the IC chip. This step replaces the original chip data with the modified data, resolving the battery issues.
Reassembling and Charging: Reassemble the battery module and install it back into the vehicle. Proceed to charge the battery to the standard voltage level.

In conclusion, repairing the Mercedes Benz 48V hybrid battery is a complex but manageable task with the help of CG100 Prog 3 or CG100X programmer. By following the comprehensive guide provided, you can effectively address battery malfunctions and restore the functionality of your vehicle's hybrid battery. Ensure you pay attention to the specific model, symptoms, and fault codes, and consider either battery replacement or chip data modification. With these tools and the right approach, you can overcome the challenges and enjoy a well-functioning hybrid battery in your Mercedes Benz.