laura_wagner1

Mini Cooper Undervoltage Issue Resolved

I am at my wit's end. My 2020 Mini Cooper diesel is exhibiting some troubling symptoms. I keep getting an undervoltage detected error. Starting the car is a struggle and various systems seem to be malfunctioning. The lights are weak. The battery voltage seems low when starting the engine. Could this be a heavily discharged or defective battery?

4 comment(s)

I've experienced a similar electrical problem with my Mini Cooper. Have you checked the battery voltage while the engine is running and when it's off? A significant voltage drop could indicate a faulty battery or a parasitic drain somewhere in the system. Also, inspect the battery terminal connections for corrosion or looseness; even a slight issue there can disrupt the power supply.

That is good information. When you refer to voltage drop, what specific values are you considering significant?

Yes, the symptoms you describe are consistent with what I experienced. A voltage drop of more than 0.5 volts while starting, or a resting voltage below 12.4 volts, is a red flag in my experience. Given your symptoms, I'd suggest having the battery professionally tested. It could save you a lot of headache down the road. If the voltage is indeed the issue, it's likely a defective battery.

I appreciate your insight. As it turns out, you were spot on. After a visit to the workshop, it was indeed the battery. A replacement set me back 290€, but the Mini Cooper is now running smoothly. No more electrical problem it seems.

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