What are the reasons why BYD does not detect the key?
2 Answers
BYD does not detect the key for the following reasons: Insufficient key battery: The battery used in the remote key is generally an ordinary button battery, with a rated working voltage of about 3.3V. Under normal circumstances, the service life can generally reach 2 years. Signal interference: Placing the key together with devices such as mobile phones, laptops, and power converters. Since radio devices such as mobile phones, laptops, and power converters emit wireless signals that interfere with the smart key, the key should be kept away from the above devices when in use. Antenna problem: There is a problem with the antenna inside the rear window glass, and the signal cannot be received. You can pay attention to whether the antenna signal amplifier is working properly and whether there is a film that causes signal shielding.
I recently encountered the issue of my BYD not detecting the key, which was quite frustrating. The most common reason is that the key battery is running low—these small button batteries typically need replacement every two years. If replacing the battery doesn’t solve the problem, the key itself might be damaged, as drops or water exposure can disrupt the internal circuits. Don’t overlook the parking location either; nearby high-voltage lines or large electronic devices can create signal interference. Additionally, if the car’s receiver module is faulty, it won’t recognize the key, requiring a professional diagnostic at a 4S shop. It’s also important to avoid storing the key near phones or credit cards, as electromagnetic interference can weaken the signal. I’ve found that pressing the key against the start button for a few seconds can sometimes wake up the system—a handy trick in emergencies.
