What are the reasons why the car key cannot start the ignition?

[DelMason]

The reasons why the car key cannot start the ignition are: 1. Nearby interference: Car remote keys transmit signals in the form of radio waves, and the vehicle's receiver performs corresponding actions upon receiving them. High-voltage power towers and radio base station facilities can interfere with radio waves, causing the car key to have power but no response; 2. Remote key circuit board failure: When the remote key circuit board fails, it can no longer be rematched, and only a new key can be replaced; 3. Insufficient battery power: As the battery power decreases, the range and strength of the radio waves will also decrease. When fully charged, remote operation can be performed from 100 meters away, but when only half the power remains, the operational distance may be reduced by half, to only 50 meters.

[VanTessa]

I recently encountered the issue where my car key wouldn't start the ignition, and most likely it's due to a dead key battery. Keyless entry car keys contain button batteries, and over time when the battery drains, the car can't detect the signal. Try pressing the buttons on your key—if the remote lock doesn't respond either, there's a 90% chance it's a battery issue. You can buy a CR2032 battery at the supermarket and replace it yourself; there are tutorials online, and it's very simple. Also, try using the spare key to see if it works. Avoid kicking the door or forcefully turning the key, as this can damage the key slot. As a preventive measure, it's recommended to check the key battery annually. Another possibility is that the internal circuitry of the key got damp or damaged from a drop—in such cases, you'll need to visit a 4S shop for a replacement. In short, prioritize checking the key to avoid travel delays.

[JuliaDella]

A seasoned driver tells you, there are many reasons why a car won't start. First, check the dashboard. If the lights don't come on, it might be a dead battery, which is common in cold weather. Try charging it or jump-starting the car. If the key responds but the car doesn't start, the ignition switch might be faulty—worn contacts or poor wiring connections could be the issue, requiring professional repair. For keyless ignition, the key must be in the designated position inside the car. The anti-theft system might be locked, indicated by a flashing anti-theft light on the dashboard. Try using the spare key to start the car; if that doesn't work, visit a 4S shop for decoding. Additionally, a faulty starter or blown fuse could also be the cause, so regular maintenance checks are important. Avoid holding the key in the start position for too long, as it can damage the battery.

[StArcher]

My new car has keyless start, but sometimes it won't ignite, which is really annoying. Most of the time it's because the key battery is weak and can't be detected by the signal. Try placing it closer to the center console. The mobile app can sometimes remotely start the car for checking functions. It could also be external interference, like a phone placed next to the key competing for the signal—try keeping them apart. Extremely cold weather can affect battery performance; try warming up the car first. As a backup, you can use the mechanical key part for a hard start. If that doesn't work, contact the dealership. Young people love upgrading their car's connectivity system, but software issues might also cause the car not to recognize the key. Regularly update the app for maintenance.