Is the buzzing sound when turning on the car key a normal phenomenon?
2 Answers
Is the buzzing sound when turning on the car key a normal phenomenon? The buzzing sound when turning on the car key is a normal phenomenon, which is the sound of the fuel pump working. When the key is turned to the ON position, the fuel pump starts working and takes a few seconds to build up sufficient fuel pressure to ensure the fuel injectors function properly and the engine starts smoothly. The correct method to start a car is: 1. Insert the key and hold it in the LOCK position for about 2 seconds; 2. Turn it to the ON position and wait for about 5 seconds for the car's computer to perform a self-check; 3. Turn the key to the START position to ignite, and release the key after the engine starts; 4. Let the car warm up for 30 seconds to about 1 minute; 5. Press the brake, shift to D gear, then release the handbrake and footbrake to start driving.
A buzzing sound when turning the car key is completely normal in many cases. When you turn the key to the second position (the pre-start position), the buzzing usually comes from the fuel pump near the gas tank working to build up oil pressure for ignition. If the buzzing occurs at the moment of starting, it's the starter motor turning the engine. I've noticed many friends mistakenly assume it's a malfunction, but as long as the sound disappears after successful startup, there's no major issue. However, be cautious if the buzzing is unusually loud or persists after turning off the key—this could indicate a burnt relay or a short circuit. It's advisable to first check for loose battery terminals yourself. If accompanied by difficulty starting or flickering headlights, visit a professional repair shop immediately for diagnosis, as prolonged electrical issues may affect driving safety. Paying attention to these details during regular maintenance can save you a lot of trouble.
