What are the reasons why the BYD S6 won't start?

[OHenry]

Here are the reasons why the BYD S6 won't start: 1. Smart key battery dead: The smart key's dead battery makes it difficult for the in-car sensor to detect it. 2. Gear position: The gear is not in P position. 3. Steering wheel: Steering wheel lock. If the car's steering wheel is locked, you can turn the steering wheel left and right while pressing the engine start button to release tension and unlock the steering wheel. 4. Battery: Insufficient voltage, dead battery, or battery damage. You can use jumper cables to start the car with another battery. 5. Out of fuel: The car won't start if it's out of fuel. 6. Engine: Engine starting system failure or other reasons.

[LaylaLynn]

I've been driving a BYD S6 for six years, and the most common situations I encounter when it won't start are three. A dead battery is the most frequent issue, especially during cold winter starts or when I forget to turn off the lights overnight—low voltage simply can't crank the engine. Starter motor failure can also cause this; last time, my car only made a clicking sound but wouldn't start, and upon inspection, the starter motor's carbon brushes were completely worn out. Fuel system problems are another culprit, like a faulty fuel pump or a clogged fuel filter preventing gasoline from reaching the engine, often occurring after prolonged driving with low fuel levels. Issues in the ignition system, such as heavily carbon-fouled spark plugs or aged ignition coils, are also not uncommon. If turning the key yields no response at all, I recommend trying a jump-start first. If that doesn’t work, just tow it to the repair shop to read the trouble codes.

[VanSimon]

Don't rush to call a tow truck if your car won't start—try these simple checks first. Pop the hood to inspect the battery terminals for looseness or corrosion; tightening them with a wrench might just do the trick. Then, listen carefully when turning the key: if you hear a rapid clicking sound but the engine doesn't turn over, it's likely a dead battery; complete silence could mean a faulty starter relay. Here's a handy trick—repeatedly shift between P and N gear while pressing the brake, as a misaligned gear switch can sometimes trigger anti-start protection. If none of these work, consider checking precision components like the crankshaft position sensor—if it fails, the ECU won't receive RPM signals and will lock out the starting function. Always keep jumper cables in your trunk for emergencies.

[FranciscoMarie]

Yesterday, my neighbor's S6 had the same issue. I helped troubleshoot and found it was a false alarm from the anti-theft system. When the smart key battery is nearly dead, the weak signal makes the car think it's an illegal start, causing it to lock up. After replacing the battery, it started right up. Also, checking the fuse box is crucial—if the main 30A power supply fuse is blown, the car won't start at all. Don't overlook fuel quality either; using low-grade gasoline can clog the fuel injectors, making cold starts particularly difficult. In fact, many faults have warning signs: if the startup delay gets progressively longer, it's likely due to an aging battery; a burning smell during startup might indicate a short circuit in the starter motor. Lastly, a reminder: avoid using low-quality jumper cables for rescue—insufficient current can actually damage the battery.

[VictoriaLee]

Over the years in auto repair, I've found that BYD S6's failure to start is mostly due to electrical issues. The most common problem is battery aging, especially for start-stop batteries, which typically last about three years. Worn starter motor carbon brushes can cause the motor to spin freely, sounding like gear slippage. Pay special attention to the EF20 fuse in the engine compartment fuse box—it's the main fuse for the starting circuit. If the car has modified audio or ambient lighting, be extra cautious, as circuit overload can blow the fuel pump fuse. Last week, a car couldn't start because aftermarket modifications caused CAN bus signal abnormalities, prompting the ECU to disable ignition. Another pitfall is the crankshaft sensor—oil contamination can disrupt its signal. I recommend keeping an OBD scanner handy; reading the trouble codes quickly pinpoints the issue.