What causes abnormal tire pressure signal in BYD Song?
4 Answers
The reasons for abnormal tire pressure signal in BYD Song are abnormal tire pressure, unreset tire pressure monitoring, or damaged tire pressure sensor. The tire pressure monitoring indicator is a yellow symbol, an irregular circle with no seal on top, four small spikes at the bottom, and an exclamation mark inside. The illumination of the tire pressure monitoring indicator indicates abnormal tire pressure. Abnormal tire pressure: Generally, an alarm will be triggered if the pressure is below 1.8bar or above 3.0bar. At this time, tire inspection and pressure adjustment are required. Tire pressure monitoring not reset: After inflating the tires, if the tire pressure is not reset in time, the tire pressure monitoring system will still record the previous data, causing the tire pressure monitoring indicator to light up. In this case, simply reset the tire pressure. Damaged tire pressure sensor: The tire pressure sensor is used to monitor tire pressure and is directly installed inside the tire, connected to the tire inflation port. If the tire pressure sensor is damaged due to impact while driving, it will also cause the tire pressure fault light to illuminate. For sensor damage issues, only a new replacement part can be used.
I've repaired many vehicles, especially models like the BYD Song equipped with tire pressure monitoring systems. Signal abnormalities usually stem from a few root causes. The most common is actual tire pressure changes, such as prolonged lack of inflation or sudden temperature drops causing leaks, triggering false alarms. The sensors themselves can also malfunction - depleted batteries or impact damage are frequent issues. BYD's sensor modules are quite delicate and prone to signal interference from rainwater corrosion. Another cause is the system software requiring reset, particularly after tire replacements or accessory installations, where electromagnetic interference may cause signal fluctuations. For routine troubleshooting, I recommend first checking with a tire pressure gauge to ensure uniform pressure across all wheels meets standard values; if normal, manually reset the system; if the issue persists, scan for error codes to locate sensor or wiring faults. Don't underestimate this - signal abnormalities can mislead you, significantly increasing risks when driving at high speeds with inaccurate tire pressure readings.
Last month when I was driving my friend's BYD Song, I also encountered an abnormal tire pressure warning signal. At first I thought a nail had punctured the tire. After checking, I found the air pressure was within the normal range, but the dashboard light kept staying on. I asked several friends who drive new energy vehicles, and they said it might be because the sensor battery is running low - these small sensors typically last about 2-3 years before needing replacement. Additionally, the system might give false alarms if it doesn't update data promptly after tire inflation. For BYD vehicles, you need to drive a short distance to let the system self-calibrate. Sometimes dirt or frost blocking the sensor position can also cause poor signal reception. The most reliable solution is to visit a 4S shop for professional diagnostic equipment rather than tampering with the wiring yourself. For regular maintenance, I make it a habit to check tire pressure monthly and keep the sensors clean to avoid unnecessary signal issues.
With over ten years of repair experience, the most common causes of abnormal tire pressure signals in BYD Song models are sensor or tire issues. For example, the sensor battery may be depleted and malfunctioning, outputting incorrect data, or the tire may have a slow leak detected by the system. Another possible reason could be loose module connections or short circuits in the wiring, especially in humid conditions during the rainy season. When troubleshooting, I first test the tire pressure directly. If it's normal, I check the sensor's operating voltage; if abnormal, I replace it. If that doesn't work, I then inspect the control unit for faults. This job is straightforward—using a tire pressure gauge to measure the pressure accurately can help with initial diagnostics. Don’t overlook regular maintenance; replacing the battery periodically can save you from costly major repairs.
