2001 Volvo S40 Engine Control Unit

While having a dead battery. I was having the vehicle charged with a charging unit on high amp charge rate. The key was left on and it was noticed there was white smoke coming from the dash, no smell. After replacing the battery the following lights stay illum. - Shift to O.D. Arrow, service engine, air bag pic. The vehicle also shifts hard from reverse. I suspect the ECU has been fried. Any way to verify? If so, what items will have to be done with the replacement part and vehicle to be back in service?