This issue affects several BMW i3 and leaves their owners speechless, as they have no idea what solution to offer. The car doesn't always charge when charging with AC power: sometimes without problems, sometimes with numerous issues, and sometimes not even starting at all. This only happens with AC chargers, but not with all of them. Trying a different charging station may resolve the issue, only to reappear the next day or shortly thereafter. This isn't limited to home wallboxes, but more generally to AC chargers, even those located in public areas. One of the reasons for this problem could be that an internal error limits the charger to 3 kW instead of the standard 7.4 kW. This, of course, causes inconvenience: slower charging, or even no charging at all. The error codes appearing on the display indicate an internal problem with the vehicle, and the first thing to do is visually inspect the wiring and connectors leading to the KLE unit. This is an auxiliary electronic charging unit that allows communication between the vehicle and the AC power grid charging station. However, this control unit is almost certainly fine. Not many people have found a fault here. Further investigation reveals that the error code indicates a fault into the EME (Electric Machine Electronics). A faulty voltage sensor located on the charging circuit board (essentially a diode) can short out. The EME goes into protection mode, limiting the system and charging. Some BMW i3 models have also been subject to an official BMW recall due to a manufacturing defect in the electronic component supplier.