There's been a deluge of failed Smart Electrics in the recent past, mine being one of them. For no explained reason other than a weak 12v battery, the high voltage pack commits suicide, draining all its cells to zero volts, throwing an apparently irreversible P code, and quite possible destroying electronics, including the BMS and the current sensor inside the pack. Given that none of these parts are sold or readily available from Mercedes, we were in quite a predicament. But please note that we've learned to correct and repair the BMS for reinstallation. And will very soon have a replacement current sensor available as well. So if you know anybody (there are hundreds at this moment) scrapping a Smart for a bricked HV battery, please pass this along. I offer the reset service on Ebay at the moment. Cheers, hope this is helpful to someone.