Limp home control methods are provided for situations of a disconnected battery power line. Preferred methods may comprise steps of: determining whether a battery voltage (V_EL) provided to an Engine Control Unit (ECU) via a main relay is less than or equal to a first standard value; correcting vehicle control factors according to the battery voltage (V_EL), if the battery voltage (V_EL) provided to the Engine Control Unit (ECU) via the main relay is larger than the first standard value; determining whether a battery voltage (V_IGK) provided to the ECU via an ignition key is less than or equal to a second standard value, if the battery voltage (V_EL) provided to the ECU via the main relay is less than or equal to the first standard value; determining that a line providing the battery voltage (V_EL) from a rear end of the main relay to the ECU is disconnected, if the battery voltage (V_IGK) provided to the ECU via the ignition key is larger than the second standard value; and correcting vehicle control factors according to the battery voltage (V_IGK) provided to the ECU via the ignition key, if the line providing the battery voltage (V_EL).
