What Are the Causes of BYD One-Key Start Failure?
3 Answers
BYD one-key start failure is caused by issues such as a dead smart key battery or the gear not being in the P position. The specific details are as follows: Dead Smart Key Battery: When the smart key battery is dead, the key's transmission power is very low, making it difficult for the car's sensor to detect it. Gear Not in P Position: For automatic transmission vehicles (AT, CVT, AMT), manufacturers specify in the manual that the gear must be in the P position when starting the engine. Steering Wheel Locked: After the car is turned off, if the steering wheel is rotated a certain degree from the centered position in one direction, it will make a "click" sound and lock. In this locked state, the one-key start function will not work.
I've encountered similar issues with BYD's one-button start malfunction several times, mainly due to the smart key battery running out of power or signal interference. For instance, that time in the parking lot, the car key was perfectly fine in my pocket, but pressing the start button just wouldn't get a response, which really stressed me out. Upon checking, I found the key battery was nearly depleted, and replacing it with a new CR2032 coin cell solved the problem. Another scenario is signal interference from nearby electronic devices, such as near strong magnetic fields or elevator entrances, where the car's anti-theft system automatically locks the starting function. I must remind everyone to keep the key in a dry place and avoid placing it too close to mobile phones, as signal interference might prevent the car from starting. Additionally, low voltage in the car's main battery is a common cause, especially when an aging battery doesn't have enough charge to power the starting system. If these simple issues are ruled out, it might be due to wear and tear or looseness in the start button itself, possibly requiring professional repair. In short, stay vigilant in such situations, avoid randomly pressing the button, and promptly visit a 4S shop for inspection.
As an owner who frequently tinkers with my car, when encountering a one-button start failure, I usually start troubleshooting from the most obvious points. The key is the primary suspect—the small CR2025 or CR2032 battery inside tends to drain quickly. I use a multimeter to check its voltage; if it drops below 3 volts, I replace it. Once, even after replacing the battery, it still didn’t work. I noticed the remote range was too short, likely due to dust buildup on the chip, so cleaning the chip interface fixed the issue. Additionally, an aging 12V car battery often causes startup failures. I measured the voltage during startup with a multimeter—if it drops below 10 volts, the battery needs replacement. The ignition button is another thing to check. If pressing it doesn’t produce a click sound or light flash, it indicates poor contact, requiring cleaning or replacement. Rusty or loose wiring connections can also cause problems, so I make a habit of periodically unplugging and re-plugging connectors to ensure stability. During routine maintenance, I pay attention to the fuses and relays in the starting system, as these components typically last around five years. Timely checks can prevent issues, but if failures persist, it’s best to take the car to a shop for module repairs.
