Second Week Results After Tesla BMS a079 Symptoms (Avoiding the Error as Much as Possible)

This is the second week’s result since the first detection of the BMS a079 phenomenon last week. So far, the BMS a079 error code has not yet appeared.

As shown in the left graph, even under the same charging conditions, the maximum cell deviation remains around 0.05 V, similar to last week. However, in the right graph, the maximum deviation has increased significantly to about 0.08 V.

This difference is also clearly visible in the statistical data.

While it’s possible to reduce stress during charging by using slow charging such control is difficult during driving. Therefore, in parallel cell groups that already show abnormalities, stress during driving may cause the issue to progress more easily.Currently, the charging limit is set to 70%, but based on the graph trend, lowering the limit to around 60% may help prevent the BMS a079 error. We’ll continue to adjust the charging limit and observe the results as much as possible before the BMS a079 error occurs.