Why a Hard Reset is Dangerous When a BMS Error Occurs

Unlike typical electronic devices, the Battery Management System (BMS) is designed to meet the highest automotive functional safety standards, ASIL-C/D. This is because errors in battery monitoring systems can lead to serious accidents such as fires or explosions. Therefore, it should not be treated in the same way as other devices that are reset in response to temporary glitches.

Many people believe that battery fires are mainly caused by overcharging or overcurrent, but in reality, these primary risks are almost always detected and controlled by the BMS.

The real danger lies in secondary physical issues such as cell aging, imbalance, or internal weak shorts within cells. In particular, weak shorts are difficult for the BMS to detect in the early stages, and they may only become problematic under certain conditions or over time.

For this reason, if the BMS reports an error, it is important to investigate the cause and operate the vehicle within a safe range.

Forcibly clearing or ignoring the error through a hard reset may conceal the underlying issue and lead to even greater risks.