What does it mean when the ETC displays 'tag invalid'?
2 Answers
The ETC displays 'tag invalid' for two reasons: 1. The user has privately removed or moved the OBU device; 2. The ETC electronic tag has fallen off or become loose. By default, ETC is dedicated to a specific vehicle, and there is a protective interlock during installation. There is a push-button switch on the side that adheres to the car's front windshield. If this switch is triggered twice in a row, it will cause the ETC tag to become invalid. You can go to the bank branch where you applied for the ETC service or the highway service office to apply for a reset. ETC stands for Electronic Toll Collection system, which refers to automatic toll collection on highways or bridges. This system requires the installation of an onboard unit containing vehicle information on the vehicle.
I once encountered a sudden ETC failure on the highway, which really stressed me out. Later, I found out it was a minor issue—my device, which had been in use for nearly three years, had a dead battery. Since the built-in battery typically lasts only two to three years, especially when the car is parked outdoors in the summer heat, which accelerates aging, I drove to the nearest ETC service center. They tested it and replaced the battery on the spot, free of charge. The whole process was quite quick, and they also reminded me to park in the shade whenever possible to extend the device's lifespan. If your account balance is insufficient or your bank card has expired, it might also trigger a failure message. I recommend checking your status via the mobile app before heading to a professional service point to avoid wasting time.
