Why does the auto start-stop function light keep flashing?
3 Answers
The reasons why the auto start-stop function light keeps flashing are: 1. High-power electrical appliances are in use; 2. The water temperature is low. The auto start-stop system automatically shuts off the engine when the vehicle comes to a temporary stop (such as at a red light) and restarts it when it's time to move forward again. Precautions for using the auto start-stop system include: 1. Quickly shift to P gear and release the brake when the engine stops; 2. Reduce current consumption; 3. Do not repeatedly press the brake when the engine is off; 4. Wait for the engine speed to drop to zero before engaging the starter gear and restarting; 5. Do not activate the auto start-stop system during low-speed parking or when the air conditioner is on.
The auto start-stop light flashing has happened to me three times, mostly due to battery issues. This feature heavily relies on the battery condition. When the charge drops below 70% or the battery ages, the system stops working and flashes a warning light. Last week, while helping a neighbor with diagnostics, his 5-year-old battery made the start-stop light flash like a disco strobe. Now, hot weather with AC on can also trigger it—the system may pause when the compressor runs at full speed. Actually, a loose seatbelt can cause false alarms too. I remember once when the dashboard flashed a yellow light, only to find a coin stuck in the passenger seatbelt slot. If you're too lazy to check, just long-press the start-stop button to force it off.
After a decade in auto repair, I've found that flashing start-stop lights typically fall into four categories: Power supply issues are the most common, where unstable battery voltage or alternator abnormalities affect system judgment; Abnormal vehicle status such as an unlatched hood or unlocked doors can trigger body sensors to restrict start-stop function; The system automatically enters sleep mode for protection when the engine is cold or exhaust is blocked; The most troublesome scenario involves computer error codes – one customer's car had its start-stop light flashing incessantly due to dust accumulation on the brake vacuum sensor. DIY checks include inspecting battery terminals for oxidation or using a diagnostic tool to read error codes. Avoid forcing the vehicle to operate to prevent unexpected stalling at traffic lights.
