What does a 48V vehicle power failure mean?
2 Answers
48V vehicle power failure means that the electrical equipment has malfunctioned. The following are the specific reasons for a 48V vehicle power failure: 1. False alarm: Due to a software program bug, the system mistakenly triggers an alarm. 2. Power loss: The 48V system is not continuously charged; it only charges during deceleration and braking. Components such as the electric water pump, electric auxiliary compressor, and air conditioning compressor are all powered by the 48V system. Additionally, during coasting, the engine stops running, and the motor maintains the vehicle speed. Therefore, on roads without traffic lights, especially on highways, power loss is more likely to occur. 3. Hardware failure: Internal short circuits in the 48V starter motor/generator, 48V wiring harness short circuits, which may cause the 48V battery switch to take protective measures and disconnect, or a malfunction in the 48V starter motor/generator cooling pipe, leading to poor heat dissipation.
A while ago, the 48V system warning light came on in my car, and it took me a long time to figure it out. The 48V mild hybrid system is much more advanced than the regular 12V system, managing functions like start-stop and kinetic energy recovery. When the warning light comes on, it basically indicates an issue with the entire electrical system—it could be a failing small battery, loose wiring connections, a malfunctioning control module, or abnormal charging. The most annoying part was the immediate failure of the start-stop function, and the acceleration felt sluggish. Eventually, I had to spend over a thousand bucks to replace the battery pack to fix it. My advice is not to delay when you see the warning light—get a professional shop to read the fault codes for an accurate diagnosis.
