Hyundai Elantra: Removal - Engine Control Module (ECM). Repair procedures - Engine Control System - Fuel System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra: Removal

In the case of the vehicle equipped with immobilizer or button engine start system, perform "Key Teaching" procedure together (Refer to "Immobilizer" or "Button Engine Start System in BE group).
Turn ignition switch OFF and disconnect the negative (-) battery cable.
Disconnect the ECM Connector (A).

Remove the battery (Refer to "Charging System" in EE group).
Remove the mounting bolts (A) and a nut (B), and then remove the ECM (C).