What are the reasons why the BYD G3 one-button start cannot detect the key?

[VivienneAnn]

BYD G3 one-button start cannot detect the key for the following reasons: 1. Dead key battery: The first thing to consider is whether the key is out of power. If the remote control distance shortens or the sensing becomes less sensitive, these are signs that the key battery is running low. In a dead battery state, the one-button start function cannot work properly, and the battery needs to be replaced. 2. Interference: Check if there is any electromagnetic interference nearby, such as signal interference sources. Some dash cams that lack proper electromagnetic shielding can also cause interference, preventing the key from being detected. 3. Gear position: Verify if there was an operational error, such as the gear not being placed in the P position.

[VanAlivia]

Last time I encountered this issue, I suspected the key fob battery was dead. Smart keys use button cell batteries, which typically last one to two years. You can try pressing the key fob button to see if the red light turns on—if it doesn’t, it’s time for a replacement. Changing the battery is simple: just buy a CR2032 model, and it’ll only cost a few bucks. Signal interference can also be a hassle, so avoid stacking your key with phones or wallets, as metal objects may block the signal. Vehicle sensor issues aren’t uncommon either, especially in cold weather when battery voltage drops, affecting detection range. As a backup, the manual start keyhole near the cupholder can be used in emergencies. Develop a good habit: check the key fob battery status every quarter to avoid getting stranded.

[SanAubree]

As an enthusiast who frequently works on car repairs, key detection failures are mostly due to signal transmission issues. The most common causes are a damaged internal chip in the key or a depleted battery—try replacing it with a new one. The vehicle system might be stuck in a bug; disconnecting the negative terminal of the battery for a few minutes can reset it. Make sure to place the key close to the steering wheel's induction area, not in a bag in the back seat. Remove interference sources like strong magnets or old phones. If the anti-theft system malfunctions, a professional diagnostic tool is needed to read the codes—consult the manual before attempting any disassembly to avoid mistakes. DIY repairs can save hundreds in mechanic fees, and regularly cleaning the key contacts prevents oxidation.

[StevenFitz]

Saving money on fixing this issue isn't hard. A dead key fob battery is the most common cause—just pop open the key cover and replace it for a few bucks. First, check if the key's indicator light flashes normally. Don't overlook signal interference: avoid storing the key in a pile of electronics. Low vehicle voltage can also trigger false alarms, so test the battery voltage before starting. Try the backup manual start on the front left door. If that fails, then consider professional diagnostics to avoid unnecessary spending.