Mercedes Auxiliary Battery Warning: What It Means and How to Fix It When your Mercedes Auxiliary Battery Warning appears on the dashboard, it doesn’t mean your car is about to fail but it is a signal that one of your ...
“Auxiliary Battery Malfunction” Mercedes Troubleshooting & Fix Guide Modern Mercedes models use a small auxiliary (buffer) battery to stabilize voltage for accessories, ECO start/stop, EIS/EZS, and park/selector locking. When the cluster shows “Auxiliary Battery Malfunction”, the car is warning that ...