How to start BYD S6 when the key is not detected?

[StLola]

BYD S6 cannot detect the key to start the method is: 1. Use the mechanical key to open the door; 2. After entering the car, insert the key next to the one-button start; 3. Press the one-button start button and wait for 20 seconds to start. BYD S6 is a medium-sized SUV with a body size of 4810 mm in length, 1855 mm in width, 1680 mm in height, a wheelbase of 2720 mm, and a fuel tank capacity of 72 liters. BYD S6 is equipped with a 1.5T inline 4-cylinder engine, with a maximum power of 113 kW and a maximum power speed of 5200 rpm, matched with a 6-speed manual transmission.

[LukasLynn]

I used to deal with this issue frequently at BYD 4S stores. If the BYD S6 can't detect the smart key, it's most likely due to a depleted key battery. Try taking out the key—there might be a small notch at the bottom that you can pry open to replace the CR2032 battery, which is available at any supermarket. If the problem persists after replacing the battery, it could be a faulty vehicle receiver or strong electromagnetic interference, such as when parked in an underground garage with weak signals. The emergency start method is: use the physical key to unlock the door, then place the smart key close to the start button inside the car—usually near the cup holder at the bottom of the center console or the storage compartment—and press the start button while holding the brake to ignite the engine. Don’t worry, most cars have this backup system designed in. However, it's still recommended to visit a professional shop to check the battery or system faults to avoid draining the car battery, as key malfunctions can affect keyless entry functionality and, if left unfixed long-term, may shorten the battery's lifespan.

[Pedro]

I just experienced this situation and it was quite frightening. That day, I was driving my BYD S6 when suddenly it alerted me that the key couldn't be detected, and the dashboard flashed a red light. I quickly rummaged through my bag for the key—was the battery dead? I didn't have any tools to replace it. A friend reminded me not to panic, as the car door has a backup keyhole—just use the small metal piece on the side of the key to insert and turn it open. After getting into the car, I threw the key into the small square induction area under the center console, held the start button for a few seconds, and the car started. Once it started successfully, I immediately went to an auto repair shop for a check. They said it was good that I handled it promptly, otherwise it could have damaged the circuit module. I recommend always keeping spare batteries at home and not placing car keys too close to mobile phones to avoid signal interference. Also, pay attention to the battery status—when the LED light dims, it's time to replace it.

[DeBriella]

Key not detected is quite common. The reasons are simple: the key battery is dead or the car battery voltage is unstable. My BYD S6 also had this issue, just pry open the key and replace the battery. Emergency start: After opening the door, sit in the driver's seat, place the key close to the metal surface near the start button (try the cup holder position), and press the button to ignite. If it doesn't work, try restarting the car battery—disconnect the negative terminal under the hood for a few minutes and reconnect. Daily maintenance advice: Check the key every 6 months, park the car outdoors to avoid geomagnetic interference, and these issues will occur less frequently.