Why does the BMW X3's start-stop function fail?
2 Answers
BMW X3's start-stop function failure may be due to low water temperature or low battery voltage. The specific reasons are as follows: It is not a failure, but rather the appropriate working environment for the automatic start-stop function has not been met. The engine temperature and water temperature need to reach an ideal state, passengers must be wearing seat belts, and the doors must be locked. The start-stop function will not activate when the heater is on. Water temperature and battery: Low water temperature, low battery voltage, the operating state of the air conditioning compressor, and many other factors can affect whether the automatic start-stop system functions properly. Reasons during startup: If the car has just been started, the automatic start function will not activate. It will only activate once the water temperature reaches the ideal state. Weather reasons: It could be due to cold weather, high engine RPM, and the water temperature not being up to standard, causing the engine start-stop to fail. It could also fail if the air conditioning is on or if the throttle is dirty.
I also encountered the issue of the start-stop function suddenly failing when driving my BMW X3. This feature is supposed to automatically shut off the engine when stopped to save fuel, but it often stops working inexplicably. The most likely reason is that my car battery is old, and insufficient voltage can't support the system's operation. Another time, it was because the winter was too cold, and the engine hadn't warmed up enough for the system to activate the start-stop. Additionally, if the air conditioning is on or the windows are open, the system may deem the conditions unsuitable and temporarily disable the function. Moreover, BMW's software often requires updates, and failing to upgrade in time can also cause malfunctions. When this happens, I always check the battery status first, using a multimeter to test the voltage. If that's fine, I take it to the dealership to scan for error codes with their computer. Regular battery maintenance is crucial—charging it every few months can extend its lifespan and prevent it from failing at critical moments. Although a malfunctioning start-stop feature won't leave you stranded, losing its fuel-saving benefits long-term is quite wasteful, so I recommend fixing it as soon as possible.
