What is the issue with abnormal tire pressure signal in BYD Song?
4 Answers
BYD Song abnormal tire pressure signal is likely due to low tire pressure or a malfunction in the tire pressure monitoring system. Tire Pressure Monitoring: Tire pressure monitoring involves real-time automatic monitoring of tire pressure during vehicle operation, alerting the driver to tire leaks or low pressure to ensure driving safety. Common tire pressure monitoring methods include: Direct Tire Pressure Monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure tire pressure. The pressure information is transmitted wirelessly from inside the tire to a central receiver module, which then displays the tire pressure data for each tire. The system automatically alerts the driver if the tire pressure is too low or if there is a leak. Indirect Tire Pressure Monitoring: When the pressure in a tire decreases, the vehicle's weight causes the rolling radius of that tire to become smaller, resulting in a higher rotational speed compared to the other wheels. By comparing the differences in rotational speed between tires, the system monitors tire pressure. Indirect tire pressure alert systems essentially rely on calculating the rolling radius of the tires to monitor pressure. Introduction to Tire Pressure Monitoring System (TPMS): TPMS combines the advantages of both systems mentioned above. It equips direct sensors in two diagonally opposite tires and includes a 4-wheel indirect system. Compared to using only a direct system, this hybrid system can reduce costs and overcome the limitation of indirect systems, which cannot detect simultaneous low pressure in multiple tires. However, it still cannot provide real-time data on the actual pressure in all four tires as a direct system does.
I ran into this issue a couple of days ago too. While driving my Song, the tire pressure signal suddenly showed an abnormality, which totally confused me. There was no obvious air leakage in the tires, and the car drove normally, but the warning light on the dashboard kept flashing. After checking, I learned that this kind of problem is most likely due to a lost signal from the tire pressure sensor inside the tire. Usually, there's no issue while driving, but the system will report an error if it can't detect the data. The battery life of these sensors is generally around five to six years, so it's quite normal for older cars to experience this. Another common situation is damaging the sensor during tire repairs. The simplest solution is to visit a shop and have them use a device to rematch the sensor. If that doesn’t work, you might need to replace the sensor module entirely. For safety reasons, it's best not to keep driving with this issue, as driving on the highway with abnormal tire pressure can be quite dangerous.
I've been driving a BYD Song for almost four years and encountered the tire pressure warning twice. Signal abnormalities generally fall into several scenarios: the sensor battery is dead, which can be fixed by replacing a small battery; the sensor was improperly positioned during tire removal, causing signal failure; a slow leak leading to a false alarm; or the system not relearning the sensors after an update. If you're handling it yourself, first use a tire pressure gauge to check if the actual pressure is normal. If it's within the standard range, you can mostly rule out a leak. Then, try holding down the reset button on the steering wheel—it might resolve a software false alarm. If that doesn't work, you'll need to visit a 4S shop to connect to a computer and identify which wheel has the issue. As a side note, avoid blasting the tire valve with a high-pressure car wash hose, as it can easily damage the sensor.
Abnormal tire pressure signals may seem trivial but shouldn't be ignored. Last time when I was driving my Song for an outing, the alarm triggered right after entering the highway. I immediately pulled over at a service area for inspection and found the right rear tire was 0.3Bar under pressure due to slow leakage. The most common cause is nail punctures requiring tire repair, followed by faulty sensors. For new vehicles, signal interference is often the culprit - even phone chargers placed near the center console can disrupt signals. The solution is straightforward: First, check for punctures and measure pressure to rule out leaks; Second, restart the vehicle; Finally, reset the system. These three steps resolve 90% of cases. If the sensor is indeed faulty, simply replace it with an OEM part, and remember to have technicians check sensor battery status during regular maintenance.
