What are the reasons why the start-stop function cannot be used after replacing the battery?
2 Answers
The reasons why the start-stop function cannot be used after replacing the battery are: 1. Insufficient battery power; 2. The external temperature is too high or too low; 3. The battery replaced is not a start-stop specific battery; 4. The battery was not activated after replacement. The functions of the start-stop system are: 1. The engine can automatically shut off, reducing fuel consumption and emissions; 2. When the engine is off, the power supply can replace the belt pulley to provide operating power for the engine cooling fan and the car's air conditioning. The functions of the battery are: 1. When starting the engine, the battery supplies power to the starting system, ignition system, and electronic fuel injection system; 2. When the engine is off or at low idle, it supplies power to the car's electrical equipment; 3. When the generator's output is insufficient, it can assist in supplying power to the electrical equipment; 4. It mitigates impact voltage in the electrical system, protecting the car's electronic equipment; 5. It can store excess electricity generated by the alternator.
After I replaced the battery last time, the start-stop system stopped working. Later, I learned that the main reason was that the new battery might not be specifically designed for start-stop systems. Generally, start-stop systems require AGM or EFB batteries, as regular batteries have lower voltage and are less durable. After installation, the system may automatically disable the start-stop function to protect the vehicle. Another factor is that the vehicle's computer might not recognize the new battery. Some cars require a programming or adaptation process at a dealership using diagnostic tools to allow the system to readjust. Additionally, loose battery connections or insufficient charge can temporarily disable the function. It's recommended to confirm the battery model before replacement next time—ask the staff or check the manual to avoid such issues. Trying to restart the vehicle a few times might help temporarily, but if the problem persists, it's best to visit a professional repair shop. Safety first.
