What is the function of the letter A in parentheses in a car?
3 Answers
An 'A' inside parentheses in a car represents the Auto Start-Stop function. This 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 again. The system is implemented by installing an enhanced motor with idle start-stop capability on a traditional engine, allowing the engine to completely shut down when idle stop conditions are met. The Auto Start-Stop function uses the vehicle's computer to determine the car's status, such as when stopped at a red light or in traffic. The computer can then control the engine to stop automatically, without affecting the operation of in-car devices like air conditioning or audio systems. This technology can save approximately 5% of fuel under normal driving conditions.
Last time I took my car for maintenance, the mechanic specifically taught me to recognize this symbol. The circle with an 'A' inside is the auto start-stop switch, which is now standard on many cars. When this function is activated, the engine automatically shuts off at red lights and restarts instantly when you press the accelerator, which does save some fuel. However, it can be annoying in city traffic with frequent stops and starts, especially when the air conditioning stops cooling during engine shutdown. Some people simply turn it off as soon as they get in the car, but I've tested it and found it can save up to 7% fuel during half an hour of traffic congestion, making it quite practical. To turn it off, there's usually a button on the center console or near the steering wheel, and a slashed icon on the dashboard indicates it's disabled.
A novice driver said this little symbol has been bothering me for two weeks! Turns out that the A button with brackets next to the gear lever is the auto hold switch. Once activated, you don't need to keep pressing the brake pedal—when stopping at a red light, a deep press on the brake will display a green icon, and you can release your foot without the car rolling. Just step on the accelerator to start, which is especially helpful for hill starts. Initially, I was always afraid it might fail, especially when the car behind was too close, so I hesitated to use it. Later, I found this function works perfectly with auto start-stop—the engine rests when in D gear, eliminating the need to shift to N. Now, commuting through eight traffic lights daily, my right foot feels much more relaxed.
