If your vehicle is showing smart keyless entry touch sensor not working on door handle, here are the most likely causes and the parts you'll need to fix each one.
The smart key system requires a strong signal from the key fob. If the fob battery is weak, the vehicle won't detect the key nearby to activate the handle sensor.
The capacitive touch sensor integrated into the door handle can fail over time due to water intrusion, physical wear, or internal electrical faults.
If the door panel was recently removed for window, lock, or body repair, the handle sensor connector may have been left unplugged or improperly seated.
Modern vehicles will automatically disable non-essential features like smart keyless entry to conserve power if the main 12V battery is weak or failing.
The vehicle uses specific antennas located in or near the doors to detect the key fob. If an antenna fails, the car won't recognize the key is near that handle.
The BCM manages the keyless entry system. A failure here can cause the touch sensors to stop responding entirely, usually affecting all doors.