The paddle shifter is available when the shift lever is in the D (Drive) position or the manual shift mode.
With the shift lever in the D position
The paddle shifter will operate when the vehicle speed is more than 6 mph (10 km/h).
Pull the [+] or [-] paddle shifter once to shift up or down one gear and the system changes from automatic mode to manual mode.
When the vehicle speed is lower than 6 mph (10 km/h), if you depress the accelerator pedal for more than 5 seconds or if you move the shift lever from Manual Shift Mode to D (Drive), the system changes from manual mode to automatic mode.
With the shift lever in the manual shift mode
Pull the [+] or [-] paddle shifter once to shift up or down one gear.
NOTICE
If the [+] and [-] paddle shifters are pulled at the same time, gear change may not occur.
Hyundai Elantra AD (2016-2020) Owners Manual: Forward Collision Avoidance (FCA) System
The Forward Collision-Avoidance Assist (FCA) system is designed to help detect
and monitor the vehicle ahead in the roadway through camera recognition to warn
the driver that a collision is imminent, and if necessary, apply emergency braking.
The camera type FCA system detects the vehicle ahead ...
Hyundai Elantra AD (2016-2020) Service Manual: Outside Rear View Mirror Components and Components Location
Component Location
1. Outside rear view mirror
...