Is It Normal for the BYD L3 One-Button Start to Fail?

[DiGemma]

It is not normal for the BYD L3 one-button start to fail, and it requires timely repair. Below is a detailed introduction about BYD automobiles: 1. Overview: BYD is a Chinese automobile brand established in 1995, primarily producing commercial cars, family cars, and batteries. Starting with a team of just over 20 people, BYD grew to become the world's second-largest rechargeable battery manufacturer by 2003, and in the same year, it established BYD Auto. 2. Others: The design of BYD automobiles incorporates both advanced international trends and aesthetic concepts that align with Chinese culture. The new BYD logo no longer uses the original blue and white color scheme; instead, it has been changed to an oval shape with added light and shadow elements.

[DelJaxon]

My BYD L3 also experienced a one-button start failure last year. At first, I thought the key was broken, but later found out the key battery was dead. This type of key uses a coin cell battery, which generally needs replacement every two to three years. Sometimes strong magnetic fields nearby can also interfere with the signal—I once couldn't start the car because my phone and key were placed together. Additionally, if the brake switch has poor contact when pressing the brake to start, the car won’t respond even if you press the button. An emergency solution is to press the key against the start button—some cars have an emergency sensing area. This issue shouldn’t be delayed; I once almost missed picking up my child and ended up spending 30 yuan to replace the key battery, which fixed it. If replacing the battery doesn’t work, it’s best to visit a 4S shop to check the control module or wiring faults.

[VonBentley]

As a veteran owner of a BYD L3 for five years, I've experienced the one-button start failure about three or four times. The most common reason is a weak battery - when the voltage drops below 11 volts, the start system stops working. The second most frequent cause is low battery in the smart key, indicated by a flashing key icon on the dashboard. Once after heavy rain, it malfunctioned, and the mechanic said it was due to water causing a short circuit in the start button. A less common reason is when the gear isn't fully in P position, or the steering wheel lock is engaged triggering the anti-theft system. For DIY solutions, first press the start button twice to power on, then depress the brake pedal firmly before attempting to start. Prolonged neglect may burn out fuses - I ended up paying an extra 200 yuan in repair costs because I delayed fixing it too long.

[VonLeonardo]

One-key start failure is usually related to several electronic components. A depleted RFID chip in the key can cause signal transmission failure - simply replace the CR2032 battery by opening the key. The travel switch under the brake pedal tends to accumulate dust, and poor contact may cause the system to misjudge that the brake isn't pressed. The microswitch in the start button has a lifespan of about 50,000 presses and may develop contact issues when aging. Unstable battery voltage can also trigger the protection mechanism. It's recommended to use a multimeter to check the brake switch voltage - it should read 12 volts when properly depressed. Try repositioning the car key in the cup holder area for re-pairing, as this is the optimal signal reception zone. For electronic faults, it's best to use a diagnostic tool to read error codes, as DIY repairs may damage the body control module.