Why is the ETC tag not being detected?
2 Answers
ETC displays tag failure due to unauthorized removal or relocation of the OBU device, or the ETC electronic tag falling off or becoming loose. It needs to be reinstalled and reactivated at the original processing point or any highway ETC service center. The ETC installation process is as follows: Upon receiving the device, first check if the ETC card and electronic tag (OBU) are damaged. Press the anti-tamper button on the back of the OBU, and the red light will briefly illuminate. The OLED screen will display "Tag Invalid" or "Please Insert Card," indicating the device is functioning normally. Clean the front windshield, ensuring the surface is smooth, clean, and dry. Then peel off the adhesive backing of the OBU and stick it to the installation position. Press firmly for 2-3 minutes to remove any air bubbles. Insert the ETC card with the front side facing the driver and the back side facing the windshield, ensuring the chip is inserted into the OBU device. ETC activation method: Insert and remove the ETC card twice consecutively until the electronic tag screen displays "Bluetooth On." If "Tag Invalid" appears when inserting and removing the card twice without the electronic tag attached, this is normal and does not affect activation. Alternatively, press the button on the top of the electronic tag to enable Bluetooth directly. Turn on the phone's Bluetooth and open the corresponding mobile app (usually a download QR code is available on the electronic tag), then enter the device activation interface. Click "Device Connection" and wait patiently for the "Connection Successful" prompt. Once connected, upload a photo of the vehicle's front to complete the activation.
I've encountered this situation several times over my years of driving. The ETC tag not being detected could be due to a dead battery. The ETC tag comes with a small built-in battery that can deplete over time, especially in summer when high temperatures accelerate aging. Incorrect installation is also common—it's best to stick it on the windshield near the rearview mirror, as being too close or too far from the antenna can cause failure. Dark window tint can also block RF signals, weakening detection. Loose wiring or hardware malfunctions might also be the issue, so check if the tag is damaged or has foreign objects. Don’t wait for problems to arise—regularly check the device’s condition and test it at toll gates. If there’s an issue, contact a service point promptly to replace the tag and avoid getting stuck on the highway.
