DTC P0686, BMW Hex Code 0x2ACB, BMW Code 10955: ECM/PCM Power Relay Control Circuit Low (MIN): Remarks

When you encounter this fault, note that in all likelihood other diagnostic fault codes will also be entered in the fault memory (throttle plate potentiometer 1 and 2, voltage supply to pedal-position sensor, etc.), as the main relay's response lag or refusal to make will prevent the power supply from reaching these components.