How to Fix BMW Auto Start-Stop Failure?
2 Answers
To fix BMW auto start-stop failure, check according to the fault codes. If there are no related fault codes, you can first perform an integration level upgrade for the vehicle. BMW's car brands include: BMW 1 Series, BMW 3 Series, BMW 5 Series New Energy, BMW 5 Series, BMW 2 Series Tourer, etc. Taking the BMW 1 Series as an example: The BMW 1 Series is a compact sedan with dimensions of 4462mm in length, 1803mm in width, and 1446mm in height, and a wheelbase of 2670mm. It is equipped with a 7-speed dual-clutch transmission. The top speed of this car is 212 km/h, with a front MacPherson independent suspension and a rear multi-link independent suspension.
The other day when I was driving my dad's BMW, the start-stop system also malfunctioned. First, I checked the battery voltage and found it was only 12.1 volts. This system is particularly sensitive to voltage and stops working if it drops below 12.4 volts. Later, I used a start-stop function diagnostic tool to read the fault code, and it turned out to be a signal drift from the brake vacuum sensor. However, the easiest trick is to switch the driving mode to SPORT, and the start-stop function immediately recovers. If you've modified seat ventilation or headlights, you also need to check if it affects the power supply module. Last week, my colleague enabled some hidden features, and the start-stop system failed but fixed itself after three days.
