felixschmitz4
Mercedes Citan Overvoltage Problems and Resolution
Summary of the thread
A 2023 Mercedes Citan owner reported overvoltage issues, leading to fault memory entries, system failures, and a weak battery on startup. The problem was suspected to be a discharged or defective battery. Another Citan owner suggested checking the voltage regulator and alternator, as a failing alternator can cause power surges. A workshop diagnosis confirmed a defective battery and alternator, with the voltage regulator causing the overvoltage, leading to necessary repairs.
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4 comment(s)
felixschmitz4 (community.author)
Thanks for the input. Was your voltage regulator issue intermittent, or a complete failure? I'm trying to figure out if I should replace the alternator or if something else is going on.
marie_schroeder13
The symptoms started intermittently, then became more frequent until the car wouldn't start. To be sure, have a workshop run a diagnostic on the alternator before replacing it.
felixschmitz4 (community.author)
I appreciate the insights. Your experience proved invaluable. I took the vehicle to a workshop, and the diagnosis confirmed a defective battery and alternator, with the voltage regulator causing the overvoltage. The repair, including parts and labor, was 290€ Thank you again for your assistance.
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MERCEDES
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CITAN
marie_schroeder13
I also drive a Citan, though with fewer kilometers. Your symptoms sound very much like what I experienced. Have you checked the voltage regulator? A failing alternator can cause a power surge and fry car electronics, leading to overvoltage situations. I am not sure about the battery though.