Hyundai Elantra: Inspection - Underdrive 
Brake Control Solenoid Valve(UD/B_VFS). Repair procedures - Automatic Transaxle Control System - Automatic Transaxle System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra: Inspection

1.
Turn ignition switch OFF.
2.
Disconnect the Solenoid valve connector.
3.
Measure resistance between sensor signal terminal and sensor ground terminal.
4.
Check that the resistance is within the specification.
(Refer to Underdrive Brake Control Solenoid Valve - "Specifications")