Can the Mercedes-Benz C-Class still be driven with a 48V fault?
4 Answers
Mercedes-Benz 48V motor fault cannot be driven. If the motor does not work, the engine cannot be started after stalling. Vehicles equipped with a 48V motor start the engine through this 48V motor, unlike other cars that use a starter motor to start the engine. The following is an introduction to Mercedes-Benz 48V: 1. Introduction: The Mercedes-Benz 48V system increases the vehicle voltage to 48V. Components such as the air conditioning compressor and power steering pump, which were previously driven by the engine, have been converted to electric drive. On this basis, a larger battery is used, and a higher-power integrated motor is added between the engine output and the transmission. 2. Function: The main role of the Mercedes-Benz 48V motor is to start the vehicle and recover kinetic energy. At the same time, during low-speed stop-and-go driving, it can directly drive the vehicle without starting the engine, and it can also assist the engine in power output during acceleration. The core components include a 48V battery, a 48V starter motor/generator, a 48V/12V (DC/DC) voltage inverter, and corresponding control modules. If the motor fails, it is recommended to go to a 4S shop for repair as soon as possible.
I've been driving a Mercedes-Benz C-Class for several years, and issues with the 48V battery system are quite common. When the warning light comes on, it indicates that the assistance system has failed. The car can still start and drive because the engine itself isn't damaged, so don't worry about a complete breakdown. However, the auto start-stop function will definitely be disabled after starting, and you may feel a lack of power during acceleration, along with possibly increased fuel consumption. Try to maintain low speeds while driving—it's okay to drive slowly on city roads, but avoid long-distance trips or highway driving to prevent voltage instability from damaging the circuits. I've noticed that such faults are often caused by battery aging or loose wiring, and delaying repairs might affect other components. For safety, it's best to drive straight to the dealership for a check-up when you see the warning light, even if it takes some time for the inspection.
I've been sharing experiences on automotive forums for years, and 48V system failures should never be ignored. When the fault warning appears on the dashboard, the vehicle can still operate for short distances like grocery runs in the city, with the engine functioning mostly normally, though acceleration may be sluggish. Remember, this system is designed to improve fuel efficiency and power output - when it fails, you lose these auxiliary functions. Driving with this fault carries significant risks; sudden stalling by the roadside would be troublesome. My recommended safety approach is: if you're relatively close to home or a repair shop, drive slowly to get there; but if the car exhibits shaking or unusual noises, pull over immediately and call for a tow truck. Regular battery maintenance can prevent such issues, especially important for older vehicles.
As an average car owner, I've heard mechanics say that 48V system malfunctions don't affect daily driving. After the warning light comes on, the car can still move, the engine won't stall, but the start-stop button becomes inoperative. Driving a few kilometers to commute is fine, but don't expect the same performance as before. For example, acceleration may become sluggish and fuel consumption may increase slightly. Once my car gave a warning, I drove slowly to the dealership for half an hour, and the inspection revealed a loose battery connection which was easily fixed. Don't panic too much, but avoid driving around for fun since unresolved faults may escalate into major issues. It's recommended to schedule maintenance immediately - minor repairs are quick and cost-effective.
