What is the reason for the failure of auto start-stop after replacing the battery?
2 Answers
The reason for the failure of auto start-stop after replacing the battery is: The battery replaced is not a dedicated start-stop battery. Starting the engine (start-stop function) requires a large current, and ordinary car batteries do not have good cyclic charging capability. Installing a regular battery will definitely prevent the start-stop function from working. Steps to replace the start-stop battery: 1. Open the two fastening buttons of the heat insulation cotton, lift the red and black insulating covers above the positive and negative terminals, and then locate the tightening nut of the battery negative terminal; 2. Use a wrench to loosen the tightening nut of the negative terminal, then use a flat-head screwdriver to slowly pry open the fastening block, and directly pull out the negative terminal; 3. Remove the positive terminal; 4. Unscrew the nut used to fix the battery locking strap and loosen the locking strap, then you can directly take out the car battery.
After replacing the new battery, the auto start-stop suddenly stopped working. I often encounter this issue, mainly because the new battery type doesn't match. The auto start-stop system requires a special battery, such as AGM or EFB models, which can handle the frequent power consumption fluctuations caused by start-stop cycles. If a regular lead-acid battery is installed, the car's computer will detect the incompatibility and automatically disable this function to prevent engine damage. Additionally, if the battery replacement wasn't done with a complete power cut, the system settings might have been lost and require a manual reset—for example, disconnecting the negative terminal for about 5 minutes before reconnecting it, allowing the system to relearn and recalibrate. Low voltage or unstable alternator output can also cause failure. It's recommended to first confirm whether the new battery specifications meet the vehicle's requirements and routinely check for loose connections to avoid wasting time troubleshooting issues that could affect driving safety. Don’t ignore it; addressing it promptly can save a lot of hassle.
