What Causes the Tire Pressure Warning Light to Come On?
3 Answers
The tire pressure warning light coming on indicates that the current pressure in one or more of the four tires is outside the normal range, signaling a potential tire pressure issue. This could be due to a puncture causing the tire pressure warning light to activate. The normal tire pressure range is between 2.3 and 2.5 bar. When the pressure drops below 1.8 bar, the tire pressure warning light will come on, prompting a visit to a 4S shop for inspection, tire repair, or inflation. Additionally, a malfunctioning tire pressure sensor can also trigger the warning light. If the internal battery of the sensor is depleted and the control unit fails to receive the sensor's signal, the warning light will illuminate. Similarly, if the control unit itself is faulty, it can cause the tire pressure warning light to come on, regardless of the actual tire pressure.
A few days ago, while driving home, the tire pressure warning light suddenly came on, which gave me quite a scare. I quickly pulled over and found that the tire pressure was indeed low—probably due to the recent drop in temperature. When the temperature falls, the air volume inside the tires contracts, naturally reducing the pressure. Alternatively, there might be a slow leak, like a loose valve or a tiny puncture, where air gradually escapes without causing a flat. I checked with a handheld tire pressure gauge, and sure enough, one tire was 20 kPa below the standard value. Fortunately, I promptly refilled it. Don’t underestimate this issue—driving with low pressure for extended periods can cause uneven tire wear, affect braking and handling, and increase the risk of accidents. I recommend checking tire pressure monthly, especially during seasonal changes. Keeping a small tire pressure gauge handy is convenient, and don’t slack off on refilling when needed—maintaining proper pressure ensures both safety and fuel efficiency.
The tire pressure warning light usually comes on due to insufficient tire pressure, such as a tire leak caused by a puncture from a nail or a faulty valve, where air slowly leaks out without an immediate blowout. Cold weather is also a common factor, as thermal contraction causes significant pressure drops. Sometimes, it's due to a faulty system sensor or depleted battery, triggering a false warning signal. With years of driving experience, I know this issue requires prompt action: first, use a tire pressure gauge to check each tire's pressure. If all readings are normal, visit a repair shop to inspect the sensors. If the pressure is low, promptly inflate or repair the tire. Maintaining standard pressure is crucial, as both overinflation and underinflation affect performance and fuel efficiency. High summer temperatures may also trigger the warning, but pressure will partially recover as the tires cool. Don't delay—safely pull over and investigate.
