Seat Ateca Diesel Undervoltage Issues

Undervoltage on a relatively new Ateca That's odd, but not unheard of. I had a similar electrical problem with my Ateca – though I don't think it’s the same year as yours. Check the battery voltage first thing in the morning, before you start the engine. Should be around 12.6V. If it's significantly lower, then voltage drop is evident and you might have a battery drain or an alternator issue. Have you noticed any issues with the alternator Like, has the battery light been on at all It's also worth checking the voltage regulator; if that's faulty, it can cause all sorts of electrical gremlins.

Thanks for the quick reply! You mentioned checking the voltage regulator. Is there a way to test that myself, or is it best left to a workshop Also, what kind of symptoms did you experience with your Ateca when you had this electrical problem

Definitely get the voltage regulator checked by a professional, unless you're comfortable with electrical diagnostics. As for my Ateca, I had similar symptoms: random system failures, and the start-stop system stopped working altogether. Ultimately, it was traced back to a faulty battery. Since you're seeing similar issues, I reckon a battery test is the first thing to do. If that doesn't solve it, then you need to start looking at the alternator and voltage regulator. But honestly, with those symptoms, the battery is the prime suspect. A workshop should be able to diagnose it pretty quickly.

Big thanks for the detailed insights! Turns out you were spot on about the battery. Had it checked out, and it was indeed heavily discharged and failing. Replaced it for 290€, and the undervoltage errors are gone. No more system failures or flickering lights. Appreciate the help!