What are the causes of engine start-stop system failure?
2 Answers
Engine start-stop system failure can be caused by: 1. Accidentally pressing the auto start-stop button, which turns off the system; 2. The engine not reaching normal operating temperature; 3. The automatic air conditioning not reaching the preset temperature; 4. Insufficient battery charge; 5. Turning the steering wheel, emergency braking, or reversing after stopping; 6. A malfunction in the auto start-stop system or wiring issues. The functions of the engine start-stop system are: 1. Automatically shutting off the engine to reduce fuel consumption and lower emissions; 2. After the engine shuts off, the power supply can replace the belt pulley to provide operating power for the engine cooling fan and in-car air conditioning.
A few days ago, the start-stop system in my car suddenly stopped working. After struggling for a while, I realized it was a battery issue. This system has particularly high requirements for the battery - it stops functioning when the voltage drops below the standard value. I also noticed that frequent short-distance driving prevents the battery from fully charging, and when the sensor detects insufficient charge, it forcibly disables the start-stop function. The system also automatically deactivates when using air conditioning in summer, which is normal protection. If your battery is over three years old and shows this symptom, I recommend getting the battery health checked immediately to avoid making multiple unnecessary trips to the repair shop like I did. The problem was completely solved only after replacing it with an AGM battery that supports start-stop systems. Cars with modified audio systems are especially prone to this issue.
