What Causes a 48-Volt Vehicle Power System Failure?
2 Answers
48-volt vehicle power system failures may be caused by listening to music when the engine is off, software version bugs, and other reasons. Below are detailed explanations of the specific causes of 48-volt vehicle power system failures: Listening to music when the engine is off: Playing music while the vehicle is turned off can drain the 12V battery. Since the 48V system is connected to the 12V system, the 48V battery will charge the 12V battery, causing the voltage of the 48V battery to drop. When it falls below a certain threshold, a "48V" fault warning will be triggered. Software version bugs: Mercedes-Benz software versions may contain bugs that cause the system to "freeze" and trigger [false alarms]. This issue can be resolved by updating to the latest software version from the German headquarters, commonly referred to as "flashing." Recently, some owners have received [recall notices for upgrading the 48V program] via text message and can visit dealerships for the upgrade.
I've driven quite a few hybrid vehicles and often encountered issues with the 48-volt electrical system. Common causes include battery aging – after three to five years of use, the battery capacity simply can't keep up, especially during cold winter starts when the problem becomes more pronounced. Then there are wiring issues, such as short circuits or loose connections – once a fuse blows, the whole system crashes. Last time my car broke down, it turned out to be due to oxidized and corroded 48-volt battery terminals causing charging failure – what a headache. Related factors include voltage instability, which might be caused by generator regulator malfunctions leading to overload. My advice is to pay close attention to dashboard warning lights – if one lights up, pull over immediately to check things out. Don't push your luck by continuing to drive, otherwise features like auto start-stop and brake energy recovery will fail, significantly increasing safety risks. During regular maintenance, remind your mechanic to inspect the system – it can save you a lot of trouble.
