Mokka Battery Issues

Greetings. The symptoms you describe – error messages, weak lights, starting trouble coupled with a low voltage code – certainly suggest a significant battery drain. While corrosion is a common culprit, the fact that you've already inspected the terminals suggests the problem may lie elsewhere. Has the vehicle undergone any recent modifications, such as the installation of an aftermarket stereo system, dashcam, or alarm, which could be drawing current even when the car is off? Furthermore, have you considered testing the battery's voltage after the vehicle has been sitting overnight to determine the extent of the discharge?

Thanks for the detailed response! No aftermarket stuff installed, everything's factory standard. I haven't tested the battery voltage after sitting overnight though, good shout. What voltage should I be looking for as a baseline? Also, could a faulty alternator cause these symptoms even if it's charging sometimes?

Indeed, a malfunctioning alternator should also be considered. However, based on the error code indicating low voltage, it is highly probable that the prevailing issue stems from a defective battery sensor. Although the alternator may still function to some extent, the faulty sensor may not be able to adequately monitor and regulate the charging process of the vehicle battery. With respect, the recommended course of action is to seek the services of a qualified workshop. The experienced professionals will be able to accurately diagnose the root cause of the issue, for a repair cost of approximately 315€.

Appreciate the advice, especially about the battery sensor. I took it to a local garage, and you were spot on – the battery sensor was the culprit. They replaced it, and the problem seems to be sorted. Thanks again for the help!