What to Do When the Engine Auto Start-Stop System is Not Available?
3 Answers
With the system activated, fasten the seat belt and turn on the air conditioning, maintaining a speed of 5 kilometers per hour and an appropriate radiator temperature to resolve this issue. Below is an introduction to the engine auto start-stop system:1. Function of Auto Start-Stop: Vehicles equipped with engine auto start-stop technology will automatically shut off the engine when temporarily stopping during driving. When it's time to proceed, the system will automatically restart the engine.2. Advantages: The primary benefit of this system is fuel efficiency; whether waiting at a red light or stuck in traffic, the engine auto start-stop technology can automatically turn off the engine when stationary, contributing to fuel savings.
I've found that the engine auto start-stop not working is mostly due to unmet conditions. For example, if the AC is cranked up too high, the engine prioritizes maintaining cooling; or if the battery charge drops below 70%, the system fears it won't restart after shutting off. Also, if the outside temperature exceeds 40°C or drops below -5°C, the engine refuses to stop. There are safety settings too—if the seatbelt isn't fastened or the door isn't closed properly, it won't engage. My personal trick: when parked, shift to P and press the brake hard a couple of times to see if it responds. If all else fails, reboot the infotainment system or check the battery health—batteries older than 4 years should be replaced. Remember, avoid installing high-power audio equipment, as it can drain voltage and trigger system protection.
Automatic start-stop failure is usually caused by battery issues. Last time my car's system went into hibernation, it was due to an aging battery. Start-stop dedicated batteries are a bit more expensive than regular ones, but they can handle frequent power cuts and restarts. If you frequently drive short distances, insufficient charging can also cause the system to fail. Another hidden fault point is the brake vacuum sensor—insufficient pressure will cut off the function. I recommend first using a multimeter to check the battery voltage; if it's below 12.6 volts when the engine is off, consider charging or replacing it. Also, check the charging system—loose alternator belts or faulty voltage regulators can mess up the start-stop function. Winter is the worst—low temperatures can halve the battery capacity. Warming up the car for five minutes before trying again works better.
