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Mercedes B Klasse Hybrid High Voltage System Issue

I have a Mercedes B Klasse, build year 2021, with a hybrid engine and 141445 kilometers. I'm getting a recurring error message about the high-voltage system. The engine unexpectedly shuts off, and engine power is reduced. Diagnostic checks show an error in the system's memory. It looks like a heavily discharged or defective battery is causing a system malfunction. A battery warning light also comes on sometimes. Has anyone else had a similar electrical fault or battery drain issue with their Mercedes hybrid?

A Mercedes B Klasse hybrid from 2021 is experiencing a recurring error message related to the high-voltage system, causing unexpected engine shutdowns and reduced power. Diagnostic checks indicate a heavily discharged or defective battery as the likely cause, with a battery warning light occasionally appearing. A similar issue was resolved by replacing the battery, which was confirmed to be heavily discharged, suggesting that addressing the battery problem promptly can prevent further electrical faults.

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4 comment(s)

Sounds rough! I had a similar issue with my B Klasse. It started with a battery warning and escalated to the engine cutting out. It felt like the car was running on fumes. Have you noticed the battery draining faster than usual, especially with the EV problem?

Thanks for your response. I haven't monitored the battery drain that closely, but it does seem to need charging more often. Can you tell me more about your experience and if the symptoms were the same?

Yep, frequent charging was my first clue. Then the power drops became more frequent until the car basically refused to drive any distance. I’d strongly recommend getting the battery checked at a workshop. Mine was heavily discharged, which caused the system malfunction. It's better to address it sooner to prevent further electrical fault.

I appreciate you sharing your experience; it's similar to what I'm seeing. I scheduled an appointment with a certified Mercedes-Benz workshop based on your suggestion. The diagnostic assessment confirmed the battery was heavily discharged and needed to be replaced. The total cost, including labor, was 290€ Thanks again for your help.

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MERCEDES

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BKLASSE