Why does the Tayron's start-stop function sometimes work and sometimes not?
2 Answers
Automatic start-stop only works under specific conditions and will not function in the following 6 situations: 1. When the engine is cold and the coolant temperature has not risen (usually below 70°C); 2. When the outside temperature is below 5°C or the interior temperature is below 20°C with the heater on; 3. When the battery charge is insufficient (below 60%); 4. When the steering wheel angle exceeds 30 degrees; 5. When the front seat belts are not fastened; 6. When parking on a slope (e.g., a 10% gradient). Tips for using the Volkswagen Tayron's automatic start-stop: ① Turning off the automatic start-stop function is not permanent; the driver needs to disable it each time they drive, though it can also be permanently disabled by a professional through coding. ② It's advisable to turn off this function in heavy traffic. Frequent starts significantly reduce ride comfort. ③ Vehicles without hill-start assist should disable this function when starting on a slope to prevent rolling backward. Possible reasons why the Volkswagen Tayron's automatic start-stop may not work: ① When the battery charge is below 60%, the start-stop function will not operate. ② The interior temperature must not be below 6°C, and the outside temperature must not be below 18°C. ③ The coolant temperature must be at least 70°C; otherwise, the engine has not reached standard operating temperature. ④ If the steering wheel angle exceeds 30 degrees, the start-stop function may not work to prevent accidents.
Last time, my Tayron's auto start-stop was also intermittent. As an experienced driver who has owned several cars, I think the most common issue is the battery—the start-stop function requires a sufficiently high battery charge. Older batteries with rapid voltage drops tend to malfunction. Especially in cold winter temperatures, electrochemical activity is poor, and the system may fail immediately after starting. If the car's air conditioning is set too high or too low, the system may also self-protect and pause the function to avoid overloading the engine. Another detail is that if the brake isn't pressed deeply enough or the speed is too high while driving, the sensor might misjudge the conditions as unmet—this requires checking fault codes with an OBD scanner. I recommend first checking the battery's lifespan, replacing it or performing regular charging maintenance. If the issue persists, visit the 4S shop for a software update.
