What is the cause of the Mercedes-Benz 48-volt on-board power system failure?

2 Answers
LeAdaline
08/28/25 6:12am
Mercedes-Benz 48-volt on-board power system failure refers to electrical equipment malfunction, indicating that the electrical device has lost its original function. This includes mechanical damage, burnout of electrical equipment, breakdown of electronic components, aging, performance degradation, etc. In actual use and maintenance, electrical equipment failures are often caused by circuit faults. Taking the Mercedes-Benz A-Class 2020 facelift A180L as an example: The manufacturer of this car is Beijing Benz, classified as a compact car, with turbocharged intake form, maximum horsepower of 136ps, maximum torque of 200nm, equipped with a 7-speed dual-clutch transmission, and configured as a 4-door 5-seater sedan.
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LeFelicity
09/10/25 4:32am
When my Mercedes 48-volt on-board electrical system had issues, I conducted thorough research and found it might involve several key factors. For instance, battery aging is quite common, as the lithium-ion batteries in 48-volt mild hybrid systems typically last only 3 to 5 years. Degradation can lead to insufficient power and trigger warning lights. Another issue is control unit failures, such as damage to the computer module handling start-stop functions or software bugs, which may require reprogramming or replacement. Loose or corroded wiring connections are also culprits, especially prone to short circuits in humid environments. I’d recommend not ignoring early symptoms and promptly visiting a dealership to scan for error codes with a diagnostic tool, then addressing the root cause with timely repairs. As an additional note, this system significantly impacts fuel consumption—when faulty, it increases fuel usage, making regular maintenance checks crucial.
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